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<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
63.80
perShareItemType
table: <entity> 63.80 </entity> <entity type> perShareItemType </entity type> <context> Awarded | ( 13,381 ) | $ 63.80 | ( 9,631 ) | $ 81.91 | ( 7,396 ) | $ 75.55 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
9631
sharesItemType
table: <entity> 9631 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
81.91
perShareItemType
table: <entity> 81.91 </entity> <entity type> perShareItemType </entity type> <context> Awarded | ( 13,381 ) | $ 63.80 | ( 9,631 ) | $ 81.91 | ( 7,396 ) | $ 75.55 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
7396
sharesItemType
table: <entity> 7396 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
75.55
perShareItemType
table: <entity> 75.55 </entity> <entity type> perShareItemType </entity type> <context> Awarded | ( 13,381 ) | $ 63.80 | ( 9,631 ) | $ 81.91 | ( 7,396 ) | $ 75.55 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
4208
sharesItemType
table: <entity> 4208 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
60.21
perShareItemType
table: <entity> 60.21 </entity> <entity type> perShareItemType </entity type> <context> Forfeited | ( 4,208 ) | $ 60.21 | ( 1,389 ) | $ 63.46 | ( 2,658 ) | $ 66.44 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
1389
sharesItemType
table: <entity> 1389 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
63.46
perShareItemType
table: <entity> 63.46 </entity> <entity type> perShareItemType </entity type> <context> Forfeited | ( 4,208 ) | $ 60.21 | ( 1,389 ) | $ 63.46 | ( 2,658 ) | $ 66.44 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
2658
sharesItemType
table: <entity> 2658 </entity> <entity type> sharesItemType </entity type> <context> None </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
66.44
perShareItemType
table: <entity> 66.44 </entity> <entity type> perShareItemType </entity type> <context> Forfeited | ( 4,208 ) | $ 60.21 | ( 1,389 ) | $ 63.46 | ( 2,658 ) | $ 66.44 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
54111
sharesItemType
table: <entity> 54111 </entity> <entity type> sharesItemType </entity type> <context> Available as of December 31 | 54,111 | $ 60.77 | 43,744 | $ 62.38 | 33,564 | $ 68.80 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
<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></tr><tr><td></td><td>2024</td><td>2023</td><td>2022</td></tr><tr><td></td><td>Number of Shares</td><td>Weighted- Averag...
table
60.77
perShareItemType
table: <entity> 60.77 </entity> <entity type> perShareItemType </entity type> <context> Available as of December 31 | 54,111 | $ 60.77 | 43,744 | $ 62.38 | 33,564 | $ 68.80 </context>
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
177.0
monetaryItemType
table: <entity> 177.0 </entity> <entity type> monetaryItemType </entity type> <context> Residential | $ 177.0 | $ 165.7 | $ 175.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
165.7
monetaryItemType
table: <entity> 165.7 </entity> <entity type> monetaryItemType </entity type> <context> Residential | $ 177.0 | $ 165.7 | $ 175.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
175.9
monetaryItemType
table: <entity> 175.9 </entity> <entity type> monetaryItemType </entity type> <context> Residential | $ 177.0 | $ 165.7 | $ 175.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
189.8
monetaryItemType
table: <entity> 189.8 </entity> <entity type> monetaryItemType </entity type> <context> Commercial | 189.8 | 184.6 | 187.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
184.6
monetaryItemType
table: <entity> 184.6 </entity> <entity type> monetaryItemType </entity type> <context> Commercial | 189.8 | 184.6 | 187.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
187.2
monetaryItemType
table: <entity> 187.2 </entity> <entity type> monetaryItemType </entity type> <context> Commercial | 189.8 | 184.6 | 187.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
34.2
monetaryItemType
table: <entity> 34.2 </entity> <entity type> monetaryItemType </entity type> <context> Municipal | 34.2 | 33.4 | 40.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
33.4
monetaryItemType
table: <entity> 33.4 </entity> <entity type> monetaryItemType </entity type> <context> Municipal | 34.2 | 33.4 | 40.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
40.2
monetaryItemType
table: <entity> 40.2 </entity> <entity type> monetaryItemType </entity type> <context> Municipal | 34.2 | 33.4 | 40.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
610.8
monetaryItemType
table: <entity> 610.8 </entity> <entity type> monetaryItemType </entity type> <context> Industrial | 610.8 | 593.6 | 589.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
593.6
monetaryItemType
table: <entity> 593.6 </entity> <entity type> monetaryItemType </entity type> <context> Industrial | 610.8 | 593.6 | 589.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
589.0
monetaryItemType
table: <entity> 589.0 </entity> <entity type> monetaryItemType </entity type> <context> Industrial | 610.8 | 593.6 | 589.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
137.2
monetaryItemType
table: <entity> 137.2 </entity> <entity type> monetaryItemType </entity type> <context> Other Power Suppliers | 137.2 | 146.1 | 165.8 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
146.1
monetaryItemType
table: <entity> 146.1 </entity> <entity type> monetaryItemType </entity type> <context> Other Power Suppliers | 137.2 | 146.1 | 165.8 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
165.8
monetaryItemType
table: <entity> 165.8 </entity> <entity type> monetaryItemType </entity type> <context> Other Power Suppliers | 137.2 | 146.1 | 165.8 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
93.7
monetaryItemType
table: <entity> 93.7 </entity> <entity type> monetaryItemType </entity type> <context> Other | 93.7 | 114.9 | 101.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
114.9
monetaryItemType
table: <entity> 114.9 </entity> <entity type> monetaryItemType </entity type> <context> Other | 93.7 | 114.9 | 101.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
101.2
monetaryItemType
table: <entity> 101.2 </entity> <entity type> monetaryItemType </entity type> <context> Other | 93.7 | 114.9 | 101.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
1242.7
monetaryItemType
table: <entity> 1242.7 </entity> <entity type> monetaryItemType </entity type> <context> Total Regulated Operations | 1,242.7 | 1,238.3 | 1,259.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
1238.3
monetaryItemType
table: <entity> 1238.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Regulated Operations | 1,242.7 | 1,238.3 | 1,259.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
1259.3
monetaryItemType
table: <entity> 1259.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Regulated Operations | 1,242.7 | 1,238.3 | 1,259.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
56.4
monetaryItemType
table: <entity> 56.4 </entity> <entity type> monetaryItemType </entity type> <context> Long-term PSA | 56.4 | 65.0 | 77.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
65.0
monetaryItemType
table: <entity> 65.0 </entity> <entity type> monetaryItemType </entity type> <context> Long-term PSA | 56.4 | 65.0 | 77.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
77.2
monetaryItemType
table: <entity> 77.2 </entity> <entity type> monetaryItemType </entity type> <context> Long-term PSA | 56.4 | 65.0 | 77.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
22.9
monetaryItemType
table: <entity> 22.9 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Wind Energy Facilities (a) Sale of Wind Energy Facilities (a) | 22.9 | 348.4 | 33.5 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
348.4
monetaryItemType
table: <entity> 348.4 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Wind Energy Facilities (a) Sale of Wind Energy Facilities (a) | 22.9 | 348.4 | 33.5 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
33.5
monetaryItemType
table: <entity> 33.5 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Wind Energy Facilities (a) Sale of Wind Energy Facilities (a) | 22.9 | 348.4 | 33.5 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
5.0
monetaryItemType
table: <entity> 5.0 </entity> <entity type> monetaryItemType </entity type> <context> Other | 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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
5.1
monetaryItemType
table: <entity> 5.1 </entity> <entity type> monetaryItemType </entity type> <context> Other | 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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
7.6
monetaryItemType
table: <entity> 7.6 </entity> <entity type> monetaryItemType </entity type> <context> Other | 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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
84.3
monetaryItemType
table: <entity> 84.3 </entity> <entity type> monetaryItemType </entity type> <context> Total ALLETE Clean Energy | 84.3 | 418.5 | 118.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
418.5
monetaryItemType
table: <entity> 418.5 </entity> <entity type> monetaryItemType </entity type> <context> Total ALLETE Clean Energy | 84.3 | 418.5 | 118.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
118.3
monetaryItemType
table: <entity> 118.3 </entity> <entity type> monetaryItemType </entity type> <context> Total ALLETE Clean Energy | 84.3 | 418.5 | 118.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
105.7
monetaryItemType
table: <entity> 105.7 </entity> <entity type> monetaryItemType </entity type> <context> Long-term Contract | 105.7 | 101.2 | 89.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
89.2
monetaryItemType
table: <entity> 89.2 </entity> <entity type> monetaryItemType </entity type> <context> Long-term Contract | 105.7 | 101.2 | 89.2 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
72.1
monetaryItemType
table: <entity> 72.1 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Renewable Development Projects | 72.1 | 92.5 | 73.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
92.5
monetaryItemType
table: <entity> 92.5 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Renewable Development Projects | 72.1 | 92.5 | 73.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
73.9
monetaryItemType
table: <entity> 73.9 </entity> <entity type> monetaryItemType </entity type> <context> Sale of Renewable Development Projects | 72.1 | 92.5 | 73.9 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
25.0
monetaryItemType
table: <entity> 25.0 </entity> <entity type> monetaryItemType </entity type> <context> Other | 25.0 | 29.3 | 30.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
29.3
monetaryItemType
table: <entity> 29.3 </entity> <entity type> monetaryItemType </entity type> <context> Other | 25.0 | 29.3 | 30.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
30.0
monetaryItemType
table: <entity> 30.0 </entity> <entity type> monetaryItemType </entity type> <context> Other | 25.0 | 29.3 | 30.0 </context>
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
<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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
202.8
monetaryItemType
table: <entity> 202.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Corporate and Other | 202.8 | 223.0 | 193.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
223.0
monetaryItemType
table: <entity> 223.0 </entity> <entity type> monetaryItemType </entity type> <context> Total Corporate and Other | 202.8 | 223.0 | 193.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
193.1
monetaryItemType
table: <entity> 193.1 </entity> <entity type> monetaryItemType </entity type> <context> Total Corporate and Other | 202.8 | 223.0 | 193.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
160.9
monetaryItemType
table: <entity> 160.9 </entity> <entity type> monetaryItemType </entity type> <context> Regulated Operations | $ 160.9 | $ 147.2 | $ 149.9 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
147.2
monetaryItemType
table: <entity> 147.2 </entity> <entity type> monetaryItemType </entity type> <context> Regulated Operations | $ 160.9 | $ 147.2 | $ 149.9 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
149.9
monetaryItemType
table: <entity> 149.9 </entity> <entity type> monetaryItemType </entity type> <context> Regulated Operations | $ 160.9 | $ 147.2 | $ 149.9 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
17.8
monetaryItemType
table: <entity> 17.8 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE Clean Energy (c) ALLETE Clean Energy (c) | 17.8 | 71.7 | 16.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
71.7
monetaryItemType
table: <entity> 71.7 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE Clean Energy (c) ALLETE Clean Energy (c) | 17.8 | 71.7 | 16.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
16.3
monetaryItemType
table: <entity> 16.3 </entity> <entity type> monetaryItemType </entity type> <context> ALLETE Clean Energy (c) ALLETE Clean Energy (c) | 17.8 | 71.7 | 16.3 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
0.6
monetaryItemType
table: <entity> 0.6 </entity> <entity type> monetaryItemType </entity type> <context> Corporate and Other (d)(e) Corporate and Other (d)(e) | 0.6 | 28.2 | 23.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
28.2
monetaryItemType
table: <entity> 28.2 </entity> <entity type> monetaryItemType </entity type> <context> Corporate and Other (d)(e) Corporate and Other (d)(e) | 0.6 | 28.2 | 23.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
23.1
monetaryItemType
table: <entity> 23.1 </entity> <entity type> monetaryItemType </entity type> <context> Corporate and Other (d)(e) Corporate and Other (d)(e) | 0.6 | 28.2 | 23.1 </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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
179.3
monetaryItemType
table: <entity> 179.3 </entity> <entity type> monetaryItemType </entity type> <context> Total 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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
247.1
monetaryItemType
table: <entity> 247.1 </entity> <entity type> monetaryItemType </entity type> <context> Total 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</td><td></td><td></td><td></td></tr><tr><td>Operating Revenue</td><td></td><td></td><td></td></tr><t...
table
189.3
monetaryItemType
table: <entity> 189.3 </entity> <entity type> monetaryItemType </entity type> <context> Total 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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
1242.7
monetaryItemType
table: <entity> 1242.7 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
β€”
monetaryItemType
table: <entity> β€” </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
β€”
monetaryItemType
table: <entity> β€” </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
79.3
monetaryItemType
table: <entity> 79.3 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | β€” | $ 79.3 | 79.3 | $ 202.8 | 282.1 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
202.8
monetaryItemType
table: <entity> 202.8 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | β€” | $ 79.3 | 79.3 | $ 202.8 | 282.1 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
282.1
monetaryItemType
table: <entity> 282.1 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | β€” | $ 79.3 | 79.3 | $ 202.8 | 282.1 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
β€”
monetaryItemType
table: <entity> β€” </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
5.0
monetaryItemType
table: <entity> 5.0 </entity> <entity type> monetaryItemType </entity type> <context> Other – Non-utility | β€” | 5.0 | 5.0 | β€” | 5.0 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
1242.7
monetaryItemType
table: <entity> 1242.7 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
84.3
monetaryItemType
table: <entity> 84.3 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,242.7 | 84.3 | 1,327.0 | 202.8 | 1,529.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
1327.0
monetaryItemType
table: <entity> 1327.0 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,242.7 | 84.3 | 1,327.0 | 202.8 | 1,529.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
202.8
monetaryItemType
table: <entity> 202.8 </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Non-utility | β€” | $ 79.3 | 79.3 | $ 202.8 | 282.1 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
1529.8
monetaryItemType
table: <entity> 1529.8 </entity> <entity type> monetaryItemType </entity type> <context> Total Operating Revenue | 1,242.7 | 84.3 | 1,327.0 | 202.8 | 1,529.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
β€”
monetaryItemType
table: <entity> β€” </entity> <entity type> monetaryItemType </entity type> <context> Contracts with Customers – Utility | $ 1,242.7 | β€” | $ 1,242.7 | β€” | $ 1,242.7 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
18.3
monetaryItemType
table: <entity> 18.3 </entity> <entity type> monetaryItemType </entity type> <context> Cost of Sales – Non-utility | β€” | 18.3 | 18.3 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
196.3
monetaryItemType
table: <entity> 196.3 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 196.3 | 57.5 | 253.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
57.5
monetaryItemType
table: <entity> 57.5 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 196.3 | 57.5 | 253.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
253.8
monetaryItemType
table: <entity> 253.8 </entity> <entity type> monetaryItemType </entity type> <context> Depreciation and Amortization | 196.3 | 57.5 | 253.8 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
52.5
monetaryItemType
table: <entity> 52.5 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 52.5 | 10.4 | 62.9 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
10.4
monetaryItemType
table: <entity> 10.4 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 52.5 | 10.4 | 62.9 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
62.9
monetaryItemType
table: <entity> 62.9 </entity> <entity type> monetaryItemType </entity type> <context> Taxes Other than Income Taxes | 52.5 | 10.4 | 62.9 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
38.7
monetaryItemType
table: <entity> 38.7 </entity> <entity type> monetaryItemType </entity type> <context> None </context>
us-gaap:SegmentReportingOtherItemAmount
<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></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
66.2
monetaryItemType
table: <entity> 66.2 </entity> <entity type> monetaryItemType </entity type> <context> Other Segment Items (a) Other Segment Items (a) | ( 38.7 ) | 66.2 | 27.5 </context>
us-gaap:SegmentReportingOtherItemAmount
<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></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
27.5
monetaryItemType
table: <entity> 27.5 </entity> <entity type> monetaryItemType </entity type> <context> Other Segment Items (a) Other Segment Items (a) | ( 38.7 ) | 66.2 | 27.5 </context>
us-gaap:SegmentReportingOtherItemAmount
<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></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
160.9
monetaryItemType
table: <entity> 160.9 </entity> <entity type> monetaryItemType </entity type> <context> Net Income (Loss) Attributable to ALLETE | $ 160.9 | $ 17.8 | $ 178.7 | $ 0.6 | $ 179.3 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
17.8
monetaryItemType
table: <entity> 17.8 </entity> <entity type> monetaryItemType </entity type> <context> Net Income (Loss) Attributable to ALLETE | $ 160.9 | $ 17.8 | $ 178.7 | $ 0.6 | $ 179.3 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
178.7
monetaryItemType
table: <entity> 178.7 </entity> <entity type> monetaryItemType </entity type> <context> Net Income (Loss) Attributable to ALLETE | $ 160.9 | $ 17.8 | $ 178.7 | $ 0.6 | $ 179.3 </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><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Year Ended December 31, 2024</td><td>Regulated Operations</td><td>ALLETE Clean Energy</td><td>Total Reportable Segments</td><td>Corpor...
table
0.6
monetaryItemType
table: <entity> 0.6 </entity> <entity type> monetaryItemType </entity type> <context> Net Income (Loss) Attributable to ALLETE | $ 160.9 | $ 17.8 | $ 178.7 | $ 0.6 | $ 179.3 </context>
us-gaap:NetIncomeLoss