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Commitments and Contingencies - Unconditional Purchase Obligations (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Minimum future commitments for purchase obligations  
Total Amounts Committed $ 10,979.4
2021 1,179.6
2022 1,111.0
2023 1,016.1
2024 821.5
2025 792.1
Later Years 6,059.1
Nuclear | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 7,843.9
2021 501.1
2022 531.2
2023 563.1
2024 596.8
2025 632.6
Later Years 5,019.1
Coal supply and transportation | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 600.1
2021 257.8
2022 190.6
2023 151.0
2024 0.7
2025 0.0
Later Years 0.0
Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 339.7
2021 58.2
2022 51.6
2023 46.5
2024 43.4
2025 44.6
Later Years 95.4
Supply and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 1,805.8
2021 337.4
2022 318.1
2023 236.7
2024 162.5
2025 96.4
Later Years 654.7
Non-Utility Energy Infrastructure | Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 380.1
2021 18.4
2022 18.2
2023 18.0
2024 18.1
2025 18.5
Later Years 288.9
Non-Utility Energy Infrastructure | Natural gas storage and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 9.8
2021 6.7
2022 1.3
2023 0.8
2024 0.0
2025 0.0
Later Years $ 1.0