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Commitments and Contingencies - Unconditional Purchase Obligations (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Minimum future commitments for purchase obligations  
Total Amounts Committed $ 9,657.5
2024 1,448.8
2025 1,178.5
2026 1,028.8
2027 1,028.2
2028 1,031.8
Later Years 3,941.4
Nuclear | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 6,280.6
2024 600.3
2025 634.5
2026 681.6
2027 730.4
2028 782.6
Later Years 2,851.2
Coal supply and transportation | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 549.0
2024 358.3
2025 164.6
2026 26.1
2027 0.0
2028 0.0
Later Years 0.0
Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 333.5
2024 56.7
2025 56.4
2026 57.5
2027 52.1
2028 48.4
Later Years 62.4
Other | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 100.6
2024 13.9
2025 13.3
2026 12.9
2027 11.6
2028 10.2
Later Years 38.7
Supply and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 1,777.2
2024 381.2
2025 274.9
2026 214.8
2027 197.4
2028 155.7
Later Years 553.2
Non-Utility Energy Infrastructure | Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 611.8
2024 34.4
2025 34.8
2026 35.9
2027 36.7
2028 34.8
Later Years 435.2
Non-Utility Energy Infrastructure | Natural gas storage and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 4.8
2024 4.0
2025 0.0
2026 0.0
2027 0.0
2028 0.1
Later Years $ 0.7