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<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 4.5 | monetaryItemType | table: <entity> 4.5 </entity> <entity type> monetaryItemType </entity type> <context> Fuel Adjustment Clause (b) Fuel Adjustment Clause (b) | 4.5 | 5.0 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 5.0 | monetaryItemType | table: <entity> 5.0 </entity> <entity type> monetaryItemType </entity type> <context> Fuel Adjustment Clause (b) Fuel Adjustment Clause (b) | 4.5 | 5.0 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 3.7 | monetaryItemType | table: <entity> 3.7 </entity> <entity type> monetaryItemType </entity type> <context> PPACA Income Tax Deferral | 3.7 | 3.9 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 3.9 | monetaryItemType | table: <entity> 3.9 </entity> <entity type> monetaryItemType </entity type> <context> PPACA Income Tax Deferral | 3.7 | 3.9 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 2.9 | monetaryItemType | table: <entity> 2.9 </entity> <entity type> monetaryItemType </entity type> <context> Other | 2.9 | 4.2 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 4.2 | monetaryItemType | table: <entity> 4.2 </entity> <entity type> monetaryItemType </entity type> <context> Other | 2.9 | 4.2 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 371.7 | monetaryItemType | table: <entity> 371.7 </entity> <entity type> monetaryItemType </entity type> <context> Total Non-Current Regulatory Assets | $ 371.7 | $ 425.4 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 425.4 | monetaryItemType | table: <entity> 425.4 </entity> <entity type> monetaryItemType </entity type> <context> Total Non-Current Regulatory Assets | $ 371.7 | $ 425.4 </context> | us-gaap:RegulatoryAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 23.0 | monetaryItemType | table: <entity> 23.0 </entity> <entity type> monetaryItemType </entity type> <context> Provision for Interim Rate Refund | $ 23.0 | — </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Fuel Adjustment Clause (b) Fuel Adjustment Clause (b) | — | $ 8.7 </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 7.2 | monetaryItemType | table: <entity> 7.2 </entity> <entity type> monetaryItemType </entity type> <context> Fuel Adjustment Clause (b) Fuel Adjustment Clause (b) | 7.2 | — </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 1.3 | monetaryItemType | table: <entity> 1.3 </entity> <entity type> monetaryItemType </entity type> <context> Other | 1.3 | $ 3.9 </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 3.9 | monetaryItemType | table: <entity> 3.9 </entity> <entity type> monetaryItemType </entity type> <context> PPACA Income Tax Deferral | 3.7 | 3.9 </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 31.5 | monetaryItemType | table: <entity> 31.5 </entity> <entity type> monetaryItemType </entity type> <context> Total Current Regulatory Liabilities | $ 31.5 | $ 3.9 </context> | us-gaap:RegulatoryLiabilityCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 292.7 | monetaryItemType | table: <entity> 292.7 </entity> <entity type> monetaryItemType </entity type> <context> Income Taxes (d) Income Taxes (d) | $ 292.7 | $ 310.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 310.0 | monetaryItemType | table: <entity> 310.0 </entity> <entity type> monetaryItemType </entity type> <context> Income Taxes (d) Income Taxes (d) | $ 292.7 | $ 310.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 77.6 | monetaryItemType | table: <entity> 77.6 </entity> <entity type> monetaryItemType </entity type> <context> Wholesale and Retail Contra AFUDC (j) Wholesale and Retail Contra AFUDC (j) | 77.6 | 78.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 78.0 | monetaryItemType | table: <entity> 78.0 </entity> <entity type> monetaryItemType </entity type> <context> Wholesale and Retail Contra AFUDC (j) Wholesale and Retail Contra AFUDC (j) | 77.6 | 78.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 74.2 | monetaryItemType | table: <entity> 74.2 </entity> <entity type> monetaryItemType </entity type> <context> Plant Removal Obligations (k) Plant Removal Obligations (k) | 74.2 | 67.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 67.0 | monetaryItemType | table: <entity> 67.0 </entity> <entity type> monetaryItemType </entity type> <context> Plant Removal Obligations (k) Plant Removal Obligations (k) | 74.2 | 67.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 40.7 | monetaryItemType | table: <entity> 40.7 </entity> <entity type> monetaryItemType </entity type> <context> Defined Benefit Pension and Other Postretirement Benefit Plans (c) Defined Benefit Pension and Other Postretirement Benefit Plans (c) | 40.7 | 48.6 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 48.6 | monetaryItemType | table: <entity> 48.6 </entity> <entity type> monetaryItemType </entity type> <context> Defined Benefit Pension and Other Postretirement Benefit Plans (c) Defined Benefit Pension and Other Postretirement Benefit Plans (c) | 40.7 | 48.6 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 59.7 | monetaryItemType | table: <entity> 59.7 </entity> <entity type> monetaryItemType </entity type> <context> Non-Jurisdictional Land Sales (l) Non-Jurisdictional Land Sales (l) | 59.7 | 30.2 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 30.2 | monetaryItemType | table: <entity> 30.2 </entity> <entity type> monetaryItemType </entity type> <context> Non-Jurisdictional Land Sales (l) Non-Jurisdictional Land Sales (l) | 59.7 | 30.2 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 17.8 | monetaryItemType | table: <entity> 17.8 </entity> <entity type> monetaryItemType </entity type> <context> Investment Tax Credits (m) Investment Tax Credits (m) | 17.8 | 13.6 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 13.6 | monetaryItemType | table: <entity> 13.6 </entity> <entity type> monetaryItemType </entity type> <context> Investment Tax Credits (m) Investment Tax Credits (m) | 17.8 | 13.6 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 6.7 | monetaryItemType | table: <entity> 6.7 </entity> <entity type> monetaryItemType </entity type> <context> Boswell Units 1 and 2 Net Plant and Equipment (n) Boswell Units 1 and 2 Net Plant and Equipment (n) | 6.7 | 6.7 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 0.6 | monetaryItemType | table: <entity> 0.6 </entity> <entity type> monetaryItemType </entity type> <context> Other | $ 1.6 | 0.6 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 15.5 | monetaryItemType | table: <entity> 15.5 </entity> <entity type> monetaryItemType </entity type> <context> Fuel Adjustment Clause (b) Fuel Adjustment Clause (b) | 0.6 | 15.5 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 0.5 | monetaryItemType | table: <entity> 0.5 </entity> <entity type> monetaryItemType </entity type> <context> Other | 0.5 | 4.4 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 4.4 | monetaryItemType | table: <entity> 4.4 </entity> <entity type> monetaryItemType </entity type> <context> Other | 0.5 | 4.4 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 570.5 | monetaryItemType | table: <entity> 570.5 </entity> <entity type> monetaryItemType </entity type> <context> Total Non-Current Regulatory Liabilities | $ 570.5 | $ 574.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Regulatory Assets and Liabilities</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Current Regulatory Assets (a) Current Reg... | table | 574.0 | monetaryItemType | table: <entity> 574.0 </entity> <entity type> monetaryItemType </entity type> <context> Total Non-Current Regulatory Liabilities | $ 570.5 | $ 574.0 </context> | us-gaap:RegulatoryLiabilityNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 3.9 | monetaryItemType | table: <entity> 3.9 </entity> <entity type> monetaryItemType </entity type> <context> Cash and Cash Equivalents | $ 3.9 </context> | us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 1.4 | monetaryItemType | table: <entity> 1.4 </entity> <entity type> monetaryItemType </entity type> <context> Accounts Receivable | 1.4 </context> | us-gaap:BusinessCombinationAcquiredReceivablesFairValue |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 25.3 | monetaryItemType | table: <entity> 25.3 </entity> <entity type> monetaryItemType </entity type> <context> Inventory (a) Inventory (a) | 25.3 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 12.8 | monetaryItemType | table: <entity> 12.8 </entity> <entity type> monetaryItemType </entity type> <context> Other Current Assets | 12.8 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 16.4 | monetaryItemType | table: <entity> 16.4 </entity> <entity type> monetaryItemType </entity type> <context> Property, Plant and Equipment - Net | 16.4 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 154.9 | monetaryItemType | table: <entity> 154.9 </entity> <entity type> monetaryItemType </entity type> <context> Goodwill (b) Goodwill (b) | 154.9 </context> | us-gaap:Goodwill |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 2.1 | monetaryItemType | table: <entity> 2.1 </entity> <entity type> monetaryItemType </entity type> <context> Other Non-Current Assets | 2.1 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 216.8 | monetaryItemType | table: <entity> 216.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets Acquired | $ 216.8 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 23.6 | monetaryItemType | table: <entity> 23.6 </entity> <entity type> monetaryItemType </entity type> <context> Current Liabilities | $ 23.6 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 28.3 | monetaryItemType | table: <entity> 28.3 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt Due Within One Year | 28.3 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 5.9 | monetaryItemType | table: <entity> 5.9 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt | 5.9 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 0.2 | monetaryItemType | table: <entity> 0.2 </entity> <entity type> monetaryItemType </entity type> <context> Other Non-Current Liabilities | 0.2 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 58.0 | monetaryItemType | table: <entity> 58.0 </entity> <entity type> monetaryItemType </entity type> <context> Total Liabilities Assumed | $ 58.0 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td><td></td><td></td></tr><tr><td>Assets Acquired</td><td></td><td></td><td></td><td></td></tr><tr><td>Cash and Cash Equivalents</td><td></td><td></td><td></td><td>$ 3.9</td><td></td></tr... | table | 158.8 | monetaryItemType | table: <entity> 158.8 </entity> <entity type> monetaryItemType </entity type> <context> Net Identifiable Assets Acquired | $ 158.8 </context> | us-gaap:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 179.7 | monetaryItemType | table: <entity> 179.7 </entity> <entity type> monetaryItemType </entity type> <context> Equity Investment Beginning Balance | $ 179.7 | $ 165.4 </context> | us-gaap:EquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 165.4 | monetaryItemType | table: <entity> 165.4 </entity> <entity type> monetaryItemType </entity type> <context> Equity Investment Beginning Balance | $ 179.7 | $ 165.4 </context> | us-gaap:EquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 5.8 | monetaryItemType | table: <entity> 5.8 </entity> <entity type> monetaryItemType </entity type> <context> Cash Investments | 5.8 | 8.2 </context> | us-gaap:PaymentsToAcquireEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 8.2 | monetaryItemType | table: <entity> 8.2 </entity> <entity type> monetaryItemType </entity type> <context> Cash Investments | 5.8 | 8.2 </context> | us-gaap:PaymentsToAcquireEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 26.5 | monetaryItemType | table: <entity> 26.5 </entity> <entity type> monetaryItemType </entity type> <context> Equity in ATC Earnings | 26.5 | 23.1 </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 23.1 | monetaryItemType | table: <entity> 23.1 </entity> <entity type> monetaryItemType </entity type> <context> Equity in ATC Earnings | 26.5 | 23.1 </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 18.9 | monetaryItemType | table: <entity> 18.9 </entity> <entity type> monetaryItemType </entity type> <context> None </context> | us-gaap:EquityMethodInvestmentDividendsOrDistributions |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 18.3 | monetaryItemType | table: <entity> 18.3 </entity> <entity type> monetaryItemType </entity type> <context> None </context> | us-gaap:EquityMethodInvestmentDividendsOrDistributions |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in ATC</td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Beginning Balance</td><td... | table | 194.4 | monetaryItemType | table: <entity> 194.4 </entity> <entity type> monetaryItemType </entity type> <context> Equity Investment Ending Balance | $ 194.4 | $ 179.7 </context> | us-gaap:EquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 126.6 | monetaryItemType | table: <entity> 126.6 </entity> <entity type> monetaryItemType </entity type> <context> Current Assets | $ 126.6 | $ 115.2 </context> | us-gaap:AssetsCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 115.2 | monetaryItemType | table: <entity> 115.2 </entity> <entity type> monetaryItemType </entity type> <context> Current Assets | $ 126.6 | $ 115.2 </context> | us-gaap:AssetsCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6792.6 | monetaryItemType | table: <entity> 6792.6 </entity> <entity type> monetaryItemType </entity type> <context> Non-Current Assets | 6,792.6 | 6,337.0 </context> | us-gaap:AssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6337.0 | monetaryItemType | table: <entity> 6337.0 </entity> <entity type> monetaryItemType </entity type> <context> Non-Current Assets | 6,792.6 | 6,337.0 </context> | us-gaap:AssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6919.2 | monetaryItemType | table: <entity> 6919.2 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,919.2 | $ 6,452.2 </context> | us-gaap:Assets |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6452.2 | monetaryItemType | table: <entity> 6452.2 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,919.2 | $ 6,452.2 </context> | us-gaap:Assets |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 482.4 | monetaryItemType | table: <entity> 482.4 </entity> <entity type> monetaryItemType </entity type> <context> Current Liabilities | $ 482.4 | $ 495.9 </context> | us-gaap:LiabilitiesCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 495.9 | monetaryItemType | table: <entity> 495.9 </entity> <entity type> monetaryItemType </entity type> <context> Current Liabilities | $ 482.4 | $ 495.9 </context> | us-gaap:LiabilitiesCurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 2808.4 | monetaryItemType | table: <entity> 2808.4 </entity> <entity type> monetaryItemType </entity type> <context> Members’ Equity | 2,808.4 | 2,635.1 </context> | us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 2635.1 | monetaryItemType | table: <entity> 2635.1 </entity> <entity type> monetaryItemType </entity type> <context> Members’ Equity | 2,808.4 | 2,635.1 </context> | us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6919.2 | monetaryItemType | table: <entity> 6919.2 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,919.2 | $ 6,452.2 </context> | us-gaap:LiabilitiesAndStockholdersEquity |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ATC Summarized Financial Data</td><td></td><td></td></tr><tr><td>Balance Sheet Data</td><td></td><td></td></tr><tr><td>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr... | table | 6452.2 | monetaryItemType | table: <entity> 6452.2 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,919.2 | $ 6,452.2 </context> | us-gaap:LiabilitiesAndStockholdersEquity |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 911.3 | monetaryItemType | table: <entity> 911.3 </entity> <entity type> monetaryItemType </entity type> <context> Revenue | $ 911.3 | $ 818.9 | $ 751.2 </context> | us-gaap:Revenues |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 818.9 | monetaryItemType | table: <entity> 818.9 </entity> <entity type> monetaryItemType </entity type> <context> Revenue | $ 911.3 | $ 818.9 | $ 751.2 </context> | us-gaap:Revenues |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 751.2 | monetaryItemType | table: <entity> 751.2 </entity> <entity type> monetaryItemType </entity type> <context> Revenue | $ 911.3 | $ 818.9 | $ 751.2 </context> | us-gaap:Revenues |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 331.2 | monetaryItemType | table: <entity> 331.2 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | $ 331.2 | $ 279.6 | $ 246.8 </context> | us-gaap:ProfitLoss |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 279.6 | monetaryItemType | table: <entity> 279.6 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | $ 331.2 | $ 279.6 | $ 246.8 </context> | us-gaap:ProfitLoss |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 246.8 | monetaryItemType | table: <entity> 246.8 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | $ 331.2 | $ 279.6 | $ 246.8 </context> | us-gaap:ProfitLoss |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 26.5 | monetaryItemType | table: <entity> 26.5 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE’s Equity in Net Income | $ 26.5 | $ 23.1 | $ 19.3 </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 23.1 | monetaryItemType | table: <entity> 23.1 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE’s Equity in Net Income | $ 26.5 | $ 23.1 | $ 19.3 </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Income Statement Data</td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions</td><td></td><td></td><td></td></t... | table | 19.3 | monetaryItemType | table: <entity> 19.3 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE’s Equity in Net Income | $ 26.5 | $ 23.1 | $ 19.3 </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in Nobles 2</td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Balance as of December 31, 2023</td><td>$ 151.5</td><td></td><td></td></tr><tr><td></td><td></td><td></t... | table | 151.5 | monetaryItemType | table: <entity> 151.5 </entity> <entity type> monetaryItemType </entity type> <context> Equity Investment Balance as of December 31, 2023 | $ 151.5 </context> | us-gaap:EquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in Nobles 2</td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Balance as of December 31, 2023</td><td>$ 151.5</td><td></td><td></td></tr><tr><td></td><td></td><td></t... | table | 1.5 | monetaryItemType | table: <entity> 1.5 </entity> <entity type> monetaryItemType </entity type> <context> None </context> | us-gaap:IncomeLossFromEquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in Nobles 2</td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Balance as of December 31, 2023</td><td>$ 151.5</td><td></td><td></td></tr><tr><td></td><td></td><td></t... | table | 4.3 | monetaryItemType | table: <entity> 4.3 </entity> <entity type> monetaryItemType </entity type> <context> None </context> | us-gaap:EquityMethodInvestmentDividendsOrDistributions |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>ALLETE’s Investment in Nobles 2</td><td></td><td></td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Equity Investment Balance as of December 31, 2023</td><td>$ 151.5</td><td></td><td></td></tr><tr><td></td><td></td><td></t... | table | 145.7 | monetaryItemType | table: <entity> 145.7 </entity> <entity type> monetaryItemType </entity type> <context> Equity Investment Balance as of December 31, 2024 | $ 145.7 </context> | us-gaap:EquityMethodInvestments |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 8.6 | monetaryItemType | table: <entity> 8.6 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:EquitySecuritiesFVNINoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:EquitySecuritiesFVNINoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 6.8 | monetaryItemType | table: <entity> 6.8 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Corporate and Governmental Debt Securities (b) Available-for-sale – Corporate and Governmental Debt Securities (b) | — | $ 6.8 | — | 6.8 </context> | us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 8.5 | monetaryItemType | table: <entity> 8.5 </entity> <entity type> monetaryItemType </entity type> <context> Cash Equivalents | 8.5 | — | — | 8.5 </context> | us-gaap:OtherRestrictedAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:OtherRestrictedAssetsNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 17.1 | monetaryItemType | table: <entity> 17.1 </entity> <entity type> monetaryItemType </entity type> <context> Total Fair Value of Assets | $ 17.1 | $ 6.8 | — | $ 23.9 </context> | us-gaap:AssetsFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 6.8 | monetaryItemType | table: <entity> 6.8 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Corporate and Governmental Debt Securities (b) Available-for-sale – Corporate and Governmental Debt Securities (b) | — | $ 6.8 | — | 6.8 </context> | us-gaap:AssetsFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:AssetsFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 23.9 | monetaryItemType | table: <entity> 23.9 </entity> <entity type> monetaryItemType </entity type> <context> Total Fair Value of Assets | $ 17.1 | $ 6.8 | — | $ 23.9 </context> | us-gaap:AssetsFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 21.1 | monetaryItemType | table: <entity> 21.1 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Compensation (c) Deferred Compensation (c) | — | $ 21.1 | — | $ 21.1 </context> | us-gaap:DeferredCompensationLiabilityClassifiedNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.6 | — | — | $ 8.6 </context> | us-gaap:LiabilitiesFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2024</td></tr><tr><td>Recurring Fair Valu... | table | 21.1 | monetaryItemType | table: <entity> 21.1 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Compensation (c) Deferred Compensation (c) | — | $ 21.1 | — | $ 21.1 </context> | us-gaap:LiabilitiesFairValueDisclosure |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Valu... | table | 8.7 | monetaryItemType | table: <entity> 8.7 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context> | us-gaap:EquitySecuritiesFVNINoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context> | us-gaap:EquitySecuritiesFVNINoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Valu... | table | — | monetaryItemType | table: <entity> — </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Equity Securities | $ 8.7 | — | — | $ 8.7 </context> | us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Valu... | table | 6.0 | monetaryItemType | table: <entity> 6.0 </entity> <entity type> monetaryItemType </entity type> <context> Available-for-sale – Corporate and Governmental Debt Securities | — | $ 6.0 | — | 6.0 </context> | us-gaap:AvailableForSaleSecuritiesDebtSecuritiesNoncurrent |
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td></td><td>Fair Value as of December 31, 2023</td></tr><tr><td>Recurring Fair Valu... | table | 5.8 | monetaryItemType | table: <entity> 5.8 </entity> <entity type> monetaryItemType </entity type> <context> Cash Equivalents | 5.8 | — | — | 5.8 </context> | us-gaap:OtherRestrictedAssetsNoncurrent |
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