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Commitments, Guarantees and Contingencies Minimum Payments for Certain Long-Term Commitments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Leasing Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2021 $ 235.0
Minimum Payments in 2022 0.0
Minimum Payments in 2023 0.0
Minimum Payments in 2024 0.0
Minimum Payments in 2025 0.0
Minimum Payments Thereafter 0.0
Easements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2021 5.8 [1]
Minimum Payments in 2022 6.0 [1]
Minimum Payments in 2023 6.1 [1]
Minimum Payments in 2024 6.1 [1]
Minimum Payments in 2025 6.2 [1]
Minimum Payments Thereafter 175.9 [1]
Long-Term Service Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2021 40.1 [2]
Minimum Payments in 2022 0.0 [2]
Minimum Payments in 2023 0.0 [2]
Minimum Payments in 2024 0.0 [2]
Minimum Payments in 2025 0.0 [2]
Minimum Payments Thereafter 0.0 [2]
PPAs [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2021 130.8 [3]
Minimum Payments in 2022 143.7 [3]
Minimum Payments in 2023 143.8 [3]
Minimum Payments in 2024 136.7 [3]
Minimum Payments in 2025 134.6 [3]
Minimum Payments Thereafter 1,215.6 [3]
Square Butte Coal-fired Unit [Member] | Square Butte PPA [Member] | Minnesota Power [Member] | Square Butte [Member] | 2021-01-01 [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
PPA Counterparty Annual Debt Service through 2024 45.5
Square Butte Coal-fired Unit [Member] | Square Butte PPA [Member] | Minnesota Power [Member] | Square Butte [Member] | 2024-01-01 [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
PPA Counterparty Annual Debt Service through 2024 30.5
Square Butte Coal-fired Unit [Member] | Square Butte PPA [Member] | Minnesota Power [Member] | Square Butte [Member] | 2022-01-01 [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
PPA Counterparty Annual Debt Service through 2024 45.5
Square Butte Coal-fired Unit [Member] | Square Butte PPA [Member] | Minnesota Power [Member] | Square Butte [Member] | 2023-01-01 [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
PPA Counterparty Annual Debt Service through 2024 $ 45.5
[1] Easement obligations represent the minimum payments for our land easement agreements at our wind energy facilities.
[2] Consists of long-term service agreements for wind energy facilities and minimum purchase commitments under coal and rail contracts.
[3] 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.)