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Commitments and Contingencies, Fuel Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Fuel Contracts [Abstract]  
Minimum annual tolerance band percentage for future rate recovery or refund of fuel costs 2.00%
Coal  
Fuel Contracts [Abstract]  
2020 $ 6.1
2021 2.3
2022 0.7
2023 0.8
2024 0.0
Thereafter 0.0
Total 9.9
Natural Gas Supply  
Fuel Contracts [Abstract]  
2020 7.1
2021 0.4
2022 0.2
2023 0.0
2024 0.0
Thereafter 0.0
Total 7.7
Natural Gas Storage and Transportation  
Fuel Contracts [Abstract]  
2020 17.5
2021 16.7
2022 14.0
2023 11.4
2024 10.0
Thereafter 22.4
Total $ 92.0