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Commitments and Contingencies - Unconditional Purchase Obligations (Details)
$ in Millions
Dec. 31, 2024
USD ($)
Minimum future commitments for purchase obligations  
Total Amounts Committed $ 9,574.0
2025 1,437.9
2026 1,183.1
2027 1,183.1
2028 1,186.8
2029 1,129.2
Later Years 3,453.9
Nuclear | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 5,680.3
2025 634.5
2026 681.6
2027 730.4
2028 782.6
2029 838.5
Later Years 2,012.7
Coal supply and transportation | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 343.4
2025 303.0
2026 33.5
2027 3.3
2028 1.7
2029 1.9
Later Years 0.0
Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 394.3
2025 59.7
2026 61.4
2027 56.1
2028 52.2
2029 25.5
Later Years 139.4
Other | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 80.2
2025 10.0
2026 10.1
2027 8.7
2028 7.1
2029 6.3
Later Years 38.0
Supply and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 2,448.0
2025 388.5
2026 357.9
2027 345.2
2028 302.6
2029 217.5
Later Years 836.3
Non-Utility Energy Infrastructure | Purchased power | Electric  
Minimum future commitments for purchase obligations  
Total Amounts Committed 623.0
2025 38.2
2026 38.6
2027 39.3
2028 40.6
2029 39.4
Later Years 426.9
Non-Utility Energy Infrastructure | Natural gas storage and transportation | Natural gas  
Minimum future commitments for purchase obligations  
Total Amounts Committed 4.8
2025 4.0
2026 0.0
2027 0.1
2028 0.0
2029 0.1
Later Years $ 0.6