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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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
54.6
monetaryItemType
table: <entity> 54.6 </entity> <entity type> monetaryItemType </entity type> <context> Accrued Taxes | 54.6 | 51.0 </context>
us-gaap:TaxesPayableCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
51.0
monetaryItemType
table: <entity> 51.0 </entity> <entity type> monetaryItemType </entity type> <context> Accrued Taxes | 54.6 | 51.0 </context>
us-gaap:TaxesPayableCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
23.4
monetaryItemType
table: <entity> 23.4 </entity> <entity type> monetaryItemType </entity type> <context> Accrued Interest | 23.4 | 21.1 </context>
us-gaap:InterestPayableCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
21.1
monetaryItemType
table: <entity> 21.1 </entity> <entity type> monetaryItemType </entity type> <context> Accrued Interest | 23.4 | 21.1 </context>
us-gaap:InterestPayableCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
94.7
monetaryItemType
table: <entity> 94.7 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt Due Within One Year | 94.7 | 111.4 </context>
us-gaap:LongTermDebtCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
111.4
monetaryItemType
table: <entity> 111.4 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt Due Within One Year | 94.7 | 111.4 </context>
us-gaap:LongTermDebtCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
117.9
monetaryItemType
table: <entity> 117.9 </entity> <entity type> monetaryItemType </entity type> <context> Other | 117.9 | 91.9 </context>
us-gaap:OtherLiabilitiesCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
91.9
monetaryItemType
table: <entity> 91.9 </entity> <entity type> monetaryItemType </entity type> <context> Other | 117.9 | 91.9 </context>
us-gaap:OtherLiabilitiesCurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
404.2
monetaryItemType
table: <entity> 404.2 </entity> <entity type> monetaryItemType </entity type> <context> Total Current Liabilities | 404.2 | 377.6 </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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
377.6
monetaryItemType
table: <entity> 377.6 </entity> <entity type> monetaryItemType </entity type> <context> Total Current Liabilities | 404.2 | 377.6 </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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1704.7
monetaryItemType
table: <entity> 1704.7 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt | 1,704.7 | 1,679.9 </context>
us-gaap:LongTermDebtNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1679.9
monetaryItemType
table: <entity> 1679.9 </entity> <entity type> monetaryItemType </entity type> <context> Long-Term Debt | 1,704.7 | 1,679.9 </context>
us-gaap:LongTermDebtNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
253.4
monetaryItemType
table: <entity> 253.4 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Income Taxes | 253.4 | 192.7 </context>
us-gaap:DeferredIncomeTaxLiabilitiesNet
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
192.7
monetaryItemType
table: <entity> 192.7 </entity> <entity type> monetaryItemType </entity type> <context> Deferred Income Taxes | 253.4 | 192.7 </context>
us-gaap:DeferredIncomeTaxLiabilitiesNet
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
570.5
monetaryItemType
table: <entity> 570.5 </entity> <entity type> monetaryItemType </entity type> <context> 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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
574.0
monetaryItemType
table: <entity> 574.0 </entity> <entity type> monetaryItemType </entity type> <context> 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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
118.2
monetaryItemType
table: <entity> 118.2 </entity> <entity type> monetaryItemType </entity type> <context> Defined Benefit Pension and Other Postretirement Benefit Plans | 118.2 | 160.8 </context>
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
160.8
monetaryItemType
table: <entity> 160.8 </entity> <entity type> monetaryItemType </entity type> <context> Defined Benefit Pension and Other Postretirement Benefit Plans | 118.2 | 160.8 </context>
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
312.8
monetaryItemType
table: <entity> 312.8 </entity> <entity type> monetaryItemType </entity type> <context> Other Non-Current Liabilities | 312.8 | 264.3 </context>
us-gaap:OtherLiabilitiesNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
264.3
monetaryItemType
table: <entity> 264.3 </entity> <entity type> monetaryItemType </entity type> <context> Other Non-Current Liabilities | 312.8 | 264.3 </context>
us-gaap:OtherLiabilitiesNoncurrent
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
3363.8
monetaryItemType
table: <entity> 3363.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Liabilities | 3,363.8 | 3,249.3 </context>
us-gaap:Liabilities
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
3249.3
monetaryItemType
table: <entity> 3249.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Liabilities | 3,363.8 | 3,249.3 </context>
us-gaap:Liabilities
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
0.4
monetaryItemType
table: <entity> 0.4 </entity> <entity type> monetaryItemType </entity type> <context> Redeemable Non-Controlling Interest | 0.4 | 0.5 </context>
us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
0.5
monetaryItemType
table: <entity> 0.5 </entity> <entity type> monetaryItemType </entity type> <context> Redeemable Non-Controlling Interest | 0.4 | 0.5 </context>
us-gaap:TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
80.0
sharesItemType
table: <entity> 80.0 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:CommonStockSharesAuthorized
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
57.9
sharesItemType
table: <entity> 57.9 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:CommonStockSharesIssued
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
57.9
sharesItemType
table: <entity> 57.9 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:CommonStockSharesOutstanding
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
57.6
sharesItemType
table: <entity> 57.6 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:CommonStockSharesOutstanding
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
57.6
sharesItemType
table: <entity> 57.6 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:CommonStockSharesIssued
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1823.2
monetaryItemType
table: <entity> 1823.2 </entity> <entity type> monetaryItemType </entity type> <context> Common Stock Without Par Value, 80.0 Shares Authorized, 57.9 and 57.6 Shares Issued and Outstanding Common Stock Without Par Value, 80.0 Shares Authorized, 57.9 and 57.6 Shares Issued and Outstanding | 1,823.2 | 1,803.7 </context>
us-gaap:CommonStockValue
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1803.7
monetaryItemType
table: <entity> 1803.7 </entity> <entity type> monetaryItemType </entity type> <context> Common Stock Without Par Value, 80.0 Shares Authorized, 57.9 and 57.6 Shares Issued and Outstanding Common Stock Without Par Value, 80.0 Shares Authorized, 57.9 and 57.6 Shares Issued and Outstanding | 1,823.2 | 1,803.7 </context>
us-gaap:CommonStockValue
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
18.1
monetaryItemType
table: <entity> 18.1 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
20.5
monetaryItemType
table: <entity> 20.5 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1042.9
monetaryItemType
table: <entity> 1042.9 </entity> <entity type> monetaryItemType </entity type> <context> Retained Earnings | 1,042.9 | 1,026.4 </context>
us-gaap:RetainedEarningsAccumulatedDeficit
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
1026.4
monetaryItemType
table: <entity> 1026.4 </entity> <entity type> monetaryItemType </entity type> <context> Retained Earnings | 1,042.9 | 1,026.4 </context>
us-gaap:RetainedEarningsAccumulatedDeficit
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
2848.0
monetaryItemType
table: <entity> 2848.0 </entity> <entity type> monetaryItemType </entity type> <context> Total ALLETE Equity | 2,848.0 | 2,809.6 </context>
us-gaap:StockholdersEquity
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
2809.6
monetaryItemType
table: <entity> 2809.6 </entity> <entity type> monetaryItemType </entity type> <context> Total ALLETE Equity | 2,848.0 | 2,809.6 </context>
us-gaap:StockholdersEquity
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
542.1
monetaryItemType
table: <entity> 542.1 </entity> <entity type> monetaryItemType </entity type> <context> Non-Controlling Interest in Subsidiaries | 542.1 | 597.0 </context>
us-gaap:MinorityInterest
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
597.0
monetaryItemType
table: <entity> 597.0 </entity> <entity type> monetaryItemType </entity type> <context> Non-Controlling Interest in Subsidiaries | 542.1 | 597.0 </context>
us-gaap:MinorityInterest
<table><tr><td></td><td></td><td></td><td></td><td></td><td></td><td></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>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
3390.1
monetaryItemType
table: <entity> 3390.1 </entity> <entity type> monetaryItemType </entity type> <context> Total Equity | 3,390.1 | 3,406.6 </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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
3406.6
monetaryItemType
table: <entity> 3406.6 </entity> <entity type> monetaryItemType </entity type> <context> Total Equity | 3,390.1 | 3,406.6 </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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
6754.3
monetaryItemType
table: <entity> 6754.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,754.3 | $ 6,656.4 </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>As of December 31</td><td>2024</td><td>2023</td></tr><tr><td>Millions</td><td></td><td></td></tr><tr><td>Assets</td><td></td><td></td></tr><tr><td>Current Assets</td><td></td><td></td></tr><tr><td>Cash and Cash Equi...
table
6656.4
monetaryItemType
table: <entity> 6656.4 </entity> <entity type> monetaryItemType </entity type> <context> Total Assets | $ 6,754.3 | $ 6,656.4 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1242.7
monetaryItemType
table: <entity> 1242.7 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | $ 1,238.3 | $ 1,259.3 </context>
us-gaap:RegulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1238.3
monetaryItemType
table: <entity> 1238.3 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | $ 1,238.3 | $ 1,259.3 </context>
us-gaap:RegulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1259.3
monetaryItemType
table: <entity> 1259.3 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | $ 1,238.3 | $ 1,259.3 </context>
us-gaap:RegulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
282.1
monetaryItemType
table: <entity> 282.1 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | 282.1 | 636.4 | 303.8 </context>
us-gaap:UnregulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
636.4
monetaryItemType
table: <entity> 636.4 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | 282.1 | 636.4 | 303.8 </context>
us-gaap:UnregulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
303.8
monetaryItemType
table: <entity> 303.8 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | 282.1 | 636.4 | 303.8 </context>
us-gaap:UnregulatedOperatingRevenue
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
5.0
monetaryItemType
table: <entity> 5.0 </entity> <entity type> monetaryItemType </entity type> <context> Other – Non-utility | 5.0 | 5.1 | 7.6 </context>
us-gaap:RevenueNotFromContractWithCustomerOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
5.1
monetaryItemType
table: <entity> 5.1 </entity> <entity type> monetaryItemType </entity type> <context> Other – Non-utility | 5.0 | 5.1 | 7.6 </context>
us-gaap:RevenueNotFromContractWithCustomerOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
7.6
monetaryItemType
table: <entity> 7.6 </entity> <entity type> monetaryItemType </entity type> <context> Other – Non-utility | 5.0 | 5.1 | 7.6 </context>
us-gaap:RevenueNotFromContractWithCustomerOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1529.8
monetaryItemType
table: <entity> 1529.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,529.8 | 1,879.8 | 1,570.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1879.8
monetaryItemType
table: <entity> 1879.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,529.8 | 1,879.8 | 1,570.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1570.7
monetaryItemType
table: <entity> 1570.7 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,529.8 | 1,879.8 | 1,570.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
129.2
monetaryItemType
table: <entity> 129.2 </entity> <entity type> monetaryItemType </entity type> <context> Cost of Sales – Non-utility | 129.2 | 473.5 | 182.8 </context>
us-gaap:CostOfGoodsAndServicesSold
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
473.5
monetaryItemType
table: <entity> 473.5 </entity> <entity type> monetaryItemType </entity type> <context> Cost of Sales – Non-utility | 129.2 | 473.5 | 182.8 </context>
us-gaap:CostOfGoodsAndServicesSold
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
182.8
monetaryItemType
table: <entity> 182.8 </entity> <entity type> monetaryItemType </entity type> <context> Cost of Sales – Non-utility | 129.2 | 473.5 | 182.8 </context>
us-gaap:CostOfGoodsAndServicesSold
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
271.5
monetaryItemType
table: <entity> 271.5 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 271.5 | 251.8 | 242.2 </context>
us-gaap:DepreciationDepletionAndAmortization
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
251.8
monetaryItemType
table: <entity> 251.8 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 271.5 | 251.8 | 242.2 </context>
us-gaap:DepreciationDepletionAndAmortization
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
242.2
monetaryItemType
table: <entity> 242.2 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 271.5 | 251.8 | 242.2 </context>
us-gaap:DepreciationDepletionAndAmortization
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
65.4
monetaryItemType
table: <entity> 65.4 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 65.4 | 57.2 | 70.4 </context>
us-gaap:TaxesOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
57.2
monetaryItemType
table: <entity> 57.2 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 65.4 | 57.2 | 70.4 </context>
us-gaap:TaxesOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
70.4
monetaryItemType
table: <entity> 70.4 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 65.4 | 57.2 | 70.4 </context>
us-gaap:TaxesOther
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1369.7
monetaryItemType
table: <entity> 1369.7 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Expenses | 1,369.7 | 1,698.9 | 1,436.5 </context>
us-gaap:CostsAndExpenses
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1698.9
monetaryItemType
table: <entity> 1698.9 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Expenses | 1,369.7 | 1,698.9 | 1,436.5 </context>
us-gaap:CostsAndExpenses
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
1436.5
monetaryItemType
table: <entity> 1436.5 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Expenses | 1,369.7 | 1,698.9 | 1,436.5 </context>
us-gaap:CostsAndExpenses
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
160.1
monetaryItemType
table: <entity> 160.1 </entity> <entity type> monetaryItemType </entity type> <context> Operating Income | 160.1 | 180.9 | 134.2 </context>
us-gaap:OperatingIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
180.9
monetaryItemType
table: <entity> 180.9 </entity> <entity type> monetaryItemType </entity type> <context> Operating Income | 160.1 | 180.9 | 134.2 </context>
us-gaap:OperatingIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
134.2
monetaryItemType
table: <entity> 134.2 </entity> <entity type> monetaryItemType </entity type> <context> Operating Income | 160.1 | 180.9 | 134.2 </context>
us-gaap:OperatingIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
81.7
monetaryItemType
table: <entity> 81.7 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:InterestExpenseNonoperating
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
80.8
monetaryItemType
table: <entity> 80.8 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:InterestExpenseNonoperating
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
75.2
monetaryItemType
table: <entity> 75.2 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:InterestExpenseNonoperating
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
25.0
monetaryItemType
table: <entity> 25.0 </entity> <entity type> monetaryItemType </entity type> <context> Equity Earnings | 25.0 | 21.7 | 18.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
21.7
monetaryItemType
table: <entity> 21.7 </entity> <entity type> monetaryItemType </entity type> <context> Equity Earnings | 25.0 | 21.7 | 18.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
18.7
monetaryItemType
table: <entity> 18.7 </entity> <entity type> monetaryItemType </entity type> <context> Equity Earnings | 25.0 | 21.7 | 18.7 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
23.0
monetaryItemType
table: <entity> 23.0 </entity> <entity type> monetaryItemType </entity type> <context> Other | 23.0 | 85.0 | 22.4 </context>
us-gaap:OtherNonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
85.0
monetaryItemType
table: <entity> 85.0 </entity> <entity type> monetaryItemType </entity type> <context> Other | 23.0 | 85.0 | 22.4 </context>
us-gaap:OtherNonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
22.4
monetaryItemType
table: <entity> 22.4 </entity> <entity type> monetaryItemType </entity type> <context> Other | 23.0 | 85.0 | 22.4 </context>
us-gaap:OtherNonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
33.7
monetaryItemType
table: <entity> 33.7 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:NonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
25.9
monetaryItemType
table: <entity> 25.9 </entity> <entity type> monetaryItemType </entity type> <context> Total Other Income (Expense) | ( 33.7 ) | 25.9 | ( 34.1 ) </context>
us-gaap:NonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
34.1
monetaryItemType
table: <entity> 34.1 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:NonoperatingIncomeExpense
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
126.4
monetaryItemType
table: <entity> 126.4 </entity> <entity type> monetaryItemType </entity type> <context> Income Before Non-Controlling Interest and Income Taxes | 126.4 | 206.8 | 100.1 </context>
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
206.8
monetaryItemType
table: <entity> 206.8 </entity> <entity type> monetaryItemType </entity type> <context> Income Before Non-Controlling Interest and Income Taxes | 126.4 | 206.8 | 100.1 </context>
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
100.1
monetaryItemType
table: <entity> 100.1 </entity> <entity type> monetaryItemType </entity type> <context> Income Before Non-Controlling Interest and Income Taxes | 126.4 | 206.8 | 100.1 </context>
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
4.7
monetaryItemType
table: <entity> 4.7 </entity> <entity type> monetaryItemType </entity type> <context> Income Tax Expense (Benefit) | 4.7 | 27.9 | ( 31.2 ) </context>
us-gaap:IncomeTaxExpenseBenefit
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
27.9
monetaryItemType
table: <entity> 27.9 </entity> <entity type> monetaryItemType </entity type> <context> Income Tax Expense (Benefit) | 4.7 | 27.9 | ( 31.2 ) </context>
us-gaap:IncomeTaxExpenseBenefit
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
31.2
monetaryItemType
table: <entity> 31.2 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:IncomeTaxExpenseBenefit
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
121.7
monetaryItemType
table: <entity> 121.7 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | 121.7 | 178.9 | 131.3 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
178.9
monetaryItemType
table: <entity> 178.9 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | 121.7 | 178.9 | 131.3 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
131.3
monetaryItemType
table: <entity> 131.3 </entity> <entity type> monetaryItemType </entity type> <context> Net Income | 121.7 | 178.9 | 131.3 </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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
57.6
monetaryItemType
table: <entity> 57.6 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
68.2
monetaryItemType
table: <entity> 68.2 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
58.0
monetaryItemType
table: <entity> 58.0 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:NetIncomeLossAttributableToNoncontrollingInterest
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
179.3
monetaryItemType
table: <entity> 179.3 </entity> <entity type> monetaryItemType </entity type> <context> Net Income Attributable to ALLETE | $ 179.3 | $ 247.1 | $ 189.3 </context>
us-gaap:NetIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
247.1
monetaryItemType
table: <entity> 247.1 </entity> <entity type> monetaryItemType </entity type> <context> Net Income Attributable to ALLETE | $ 179.3 | $ 247.1 | $ 189.3 </context>
us-gaap:NetIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
189.3
monetaryItemType
table: <entity> 189.3 </entity> <entity type> monetaryItemType </entity type> <context> Net Income Attributable to ALLETE | $ 179.3 | $ 247.1 | $ 189.3 </context>
us-gaap:NetIncomeLoss
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
57.7
sharesItemType
table: <entity> 57.7 </entity> <entity type> sharesItemType </entity type> <context> Basic | 57.7 | 57.3 | 55.9 </context>
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
57.3
sharesItemType
table: <entity> 57.3 </entity> <entity type> sharesItemType </entity type> <context> Basic | 57.7 | 57.3 | 55.9 </context>
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic
<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>Year Ended December 31</td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td>Millions Except Per Share Amounts</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td>...
table
55.9
sharesItemType
table: <entity> 55.9 </entity> <entity type> sharesItemType </entity type> <context> Basic | 57.7 | 57.3 | 55.9 </context>
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic