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Commitments and Contingencies, Fuel Contracts (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Coal  
Fuel Contracts [Abstract]  
2017 $ 195.2
2018 0.0
2019 0.0
2020 0.0
2021 0.0
Thereafter 0.0
Total 195.2
Natural Gas Supply  
Fuel Contracts [Abstract]  
2017 16.7
2018 0.0
2019 0.0
2020 0.0
2021 0.0
Thereafter 0.0
Total 16.7
Natural Gas Storage and Transportation  
Fuel Contracts [Abstract]  
2017 22.8
2018 20.8
2019 21.4
2020 21.4
2021 16.3
Thereafter 58.2
Total $ 160.9
Minimum  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Fuel Contract Expiration Date 2017
Maximum  
Unrecorded Unconditional Purchase Obligation [Line Items]  
Fuel Contract Expiration Date 2033