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Commitments, Guarantees and Contingencies Minimum Payments for Certain Long-Term Commitments (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Capital Purchase Obligations [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2023 $ 26.6
Minimum Payments in 2024 10.6
Minimum Payments in 2025 1.3
Minimum Payments in 2026 2.7
Minimum Payments in 2027 0.0
Minimum Payments Thereafter 0.6
Easements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2023 7.8 [1]
Minimum Payments in 2024 7.9 [1]
Minimum Payments in 2025 8.0 [1]
Minimum Payments in 2026 8.1 [1]
Minimum Payments in 2027 8.2 [1]
Minimum Payments Thereafter 206.9 [1]
PPAs [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2023 151.3 [2]
Minimum Payments in 2024 145.8 [2]
Minimum Payments in 2025 137.0 [2]
Minimum Payments in 2026 136.9 [2]
Minimum Payments in 2027 123.6 [2]
Minimum Payments Thereafter 1,010.3 [2]
Long-Term Service Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2023 49.9 [3]
Minimum Payments in 2024 10.2 [3]
Minimum Payments in 2025 6.5 [3]
Minimum Payments in 2026 0.0 [3]
Minimum Payments in 2027 0.0 [3]
Minimum Payments Thereafter $ 0.0 [3]
[1] Easement obligations represent the minimum payments for our land easement agreements at our wind energy facilities.
[2] Does not include the Oliver Wind I, Oliver Wind II or Nobles 2 PPAs, as Minnesota Power only pays for energy as it is delivered. (See Power Purchase Agreements.)
[3] Consists of long-term service agreements for wind energy facilities and minimum purchase commitments under coal and rail contracts.