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Commitments, Guarantees and Contingencies Minimum Payments for Certain Long-Term Commitments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Capital Purchase Obligations [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2022 $ 50.7
Minimum Payments in 2023 0.1
Minimum Payments in 2024 0.0
Minimum Payments in 2025 0.0
Minimum Payments in 2026 0.0
Minimum Payments Thereafter 0.0
Easements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2022 8.2 [1]
Minimum Payments in 2023 8.4 [1]
Minimum Payments in 2024 8.4 [1]
Minimum Payments in 2025 8.8 [1]
Minimum Payments in 2026 9.2 [1]
Minimum Payments Thereafter 239.7 [1]
PPAs [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2022 141.1 [2]
Minimum Payments in 2023 140.7 [2]
Minimum Payments in 2024 133.5 [2]
Minimum Payments in 2025 131.4 [2]
Minimum Payments in 2026 138.3 [2]
Minimum Payments Thereafter 1,060.6 [2]
Long-Term Service Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2022 58.9 [3]
Minimum Payments in 2023 22.5 [3]
Minimum Payments in 2024 23.1 [3]
Minimum Payments in 2025 0.0 [3]
Minimum Payments in 2026 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 agreement with Manitoba Hydro expiring in 2022, as this contract is for surplus energy only; or 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.