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Commitments, Guarantees and Contingencies Minimum Payments for Certain Long-Term Commitments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Leasing Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2019 $ 292.7
Minimum Payments in 2020 0.0
Minimum Payments in 2021 0.0
Minimum Payments in 2022 0.0
Minimum Payments in 2023 0.0
Minimum Payments Thereafter 0.0
Easements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2019 5.0 [1]
Minimum Payments in 2020 5.3 [1]
Minimum Payments in 2021 5.4 [1]
Minimum Payments in 2022 5.5 [1]
Minimum Payments in 2023 5.5 [1]
Minimum Payments Thereafter 170.4 [1]
Long-Term Service Agreements [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2019 22.8 [2]
Minimum Payments in 2020 9.6 [2]
Minimum Payments in 2021 0.0 [2]
Minimum Payments in 2022 0.0 [2]
Minimum Payments in 2023 0.0 [2]
Minimum Payments Thereafter 0.1 [2]
PPAs [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
Minimum Payments in 2019 113.0 [3]
Minimum Payments in 2020 122.5 [3]
Minimum Payments in 2021 145.5 [3]
Minimum Payments in 2022 145.6 [3]
Minimum Payments in 2023 138.5 [3]
Minimum Payments Thereafter 1,386.7 [3]
Square Butte Coal-fired Unit [Member] | Square Butte PPA [Member] | Minnesota Power [Member] | Square Butte [Member] | 2020-01-01 [Member]  
Minimum Annual Payments for Certain Long-Term Commitments [Line Items]  
PPA Counterparty Annual Debt Service through 2024 48.7
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 48.7
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 33.6
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 48.7
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 $ 48.7
[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; Oliver Wind I and Oliver Wind II, as Minnesota Power only pays for energy as it is delivered; and the agreement with Nobles 2 commencing in 2020 as it is subject to construction of a wind energy facility. (See Power Purchase Agreements.)