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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Long-term Purchase Commitment [Line Items]    
Long-term Debt, Future Minimum Payments Due $ 13,205.0  
Long-term Debt, Future Minimum Payments Due, Next Twelve Months 1,260.0  
Long-term Debt, Future Minimum Payments, Due in Two Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Three Years 1,090.0  
Long-term Debt, Future Minimum Payments, Due in Four Years 1,055.0  
Long-term Debt, Future Minimum Payments, Due in Five Years 1,350.0  
Long-term Debt, Future Minimum Payments, Due Thereafter 8,450.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due 8,090.3  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months 566.2  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years 551.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years 531.7  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years 481.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years 453.9  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter 5,505.8  
Finance Leases, Future Minimum Payments Due 429.4  
Finance Leases, Future Minimum Payments Due, Next Twelve Months 34.6  
Finance Leases, Future Minimum Payments Due in Two Years 29.4  
Finance Leases, Future Minimum Payments Due in Three Years 24.2  
Finance Leases, Future Minimum Payments Due in Four Years 23.0  
Finance Leases, Future Minimum Payments Due in Five Years 19.0  
Finance Leases, Future Minimum Payments Due Thereafter 299.2  
Operating Leases, Future Minimum Payments Due 30.9  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 10.0  
Operating Leases, Future Minimum Payments, Due in Two Years 5.3  
Operating Leases, Future Minimum Payments, Due in Three Years 4.3  
Operating Leases, Future Minimum Payments, Due in Four Years 3.1  
Operating Leases, Future Minimum Payments, Due in Five Years 2.5  
Operating Leases, Future Minimum Payments, Due Thereafter 5.7  
Energy Commodity Contracts, Future Minimum Payments Due 119.7  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months 118.5  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years 0.3  
Energy Commodity Contracts, Future Minimum Payments, Due in Three Years 0.3  
Energy Commodity Contracts, Future Minimum Payments, Due in Four Years 0.4  
Energy Commodity Contracts, Future Minimum Payments, Due in Five Years 0.2  
Energy Commodity Contracts, Future Minimum Payments, Due Thereafter 0.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due 2,694.6  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months 685.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years 631.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years 609.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years 373.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years 245.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter 150.3  
Service Obligations, IT Service Obligations, Future Minimum Payments Due 120.7  
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months 73.9  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years 30.3  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years 11.4  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years 5.1  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years 0.0  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter 0.0  
Plant equipment purchase obligations, Future Minimum Payments, Due Thereafter 0.0  
Plant equipment purchase obligations, Future Minimum Payments, Due in Five Years 0.0  
Plant equipment purchase obligations, Future Minimum Payments, Due in Four Years 3.8  
Plant equipment purchase obligations, Future Minimum Payments, Due in Three Years 4.3  
Plant equipment purchase obligations, Future Minimum Payments, Due in Two Years 24.9  
Plant equipment purchase obligations, Future Minimum Payments Due, Next Twelve Months 140.5  
Plant equipment purchase obligations, Future Minimum Payments Due 173.5  
Other Liabilities, Future Minimum Payments Due 336.0  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months 287.0  
Other Liabilities, Future Minimum Payments, Due in Two Years 7.9  
Other Liabilities, Future Minimum Payments, Due in Three Years 7.7  
Other Liabilities, Future Minimum Payments, Due in Four Years 7.6  
Other Liabilities, Future Minimum Payments, Due in Five Years 7.7  
Other Liabilities, Future Minimum Payments, Due Thereafter 18.1  
Total Future Contractual Obligations Due 25,200.1  
Total Future Contractual Obligations Due, Next Twelve Months 3,176.2  
Total Future Contractual Obligations, Due in Two Years 1,280.4  
Total Future Contractual Obligations, Due in Three Years 2,283.1  
Total Future Contractual Obligations, Due in Four Years 1,952.8  
Total Future Contractual Obligations, Due in Five Years 2,078.5  
Total Future Contractual Obligations, Due Thereafter 14,429.1  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (95.5) $ (81.1)
Finance Lease, Liability, Undiscounted Excess Amount (183.2)  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ (3.6)