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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Long-term Purchase Commitment [Line Items]    
Long-term Debt, Future Minimum Payments Due $ 10,955.0  
Long-term Debt, Future Minimum Payments Due, Next Twelve Months 0.0  
Long-term Debt, Future Minimum Payments, Due in Two Years 1,260.0  
Long-term Debt, Future Minimum Payments, Due in Three Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Four Years 1,090.0  
Long-term Debt, Future Minimum Payments, Due in Five Years 1,055.0  
Long-term Debt, Future Minimum Payments, Due Thereafter 7,550.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due 6,017.8  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months 431.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years 431.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years 418.5  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years 399.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years 349.0  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter 3,989.0  
Finance Leases, Future Minimum Payments Due 321.8  
Finance Leases, Future Minimum Payments Due, Next Twelve Months 34.8  
Finance Leases, Future Minimum Payments Due in Two Years 30.7  
Finance Leases, Future Minimum Payments Due in Three Years 25.7  
Finance Leases, Future Minimum Payments Due in Four Years 20.6  
Finance Leases, Future Minimum Payments Due in Five Years 19.3  
Finance Leases, Future Minimum Payments Due Thereafter 190.7  
Operating Leases, Future Minimum Payments Due 39.7  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 9.6  
Operating Leases, Future Minimum Payments, Due in Two Years 5.9  
Operating Leases, Future Minimum Payments, Due in Three Years 5.4  
Operating Leases, Future Minimum Payments, Due in Four Years 4.6  
Operating Leases, Future Minimum Payments, Due in Five Years 3.2  
Operating Leases, Future Minimum Payments, Due Thereafter 11.0  
Energy Commodity Contracts, Future Minimum Payments Due 153.9  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months 114.7  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years 39.2  
Energy Commodity Contracts, Future Minimum Payments, Due in Three Years 0.0  
Energy Commodity Contracts, Future Minimum Payments, Due in Four Years 0.0  
Energy Commodity Contracts, Future Minimum Payments, Due in Five Years 0.0  
Energy Commodity Contracts, Future Minimum Payments, Due Thereafter 0.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due 2,196.6  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months 652.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years 485.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years 406.3  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years 388.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years 162.3  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter 101.6  
Service Obligations, IT Service Obligations, Future Minimum Payments Due 161.8  
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months 83.6  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years 57.2  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years 16.7  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years 4.3  
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  
Other Liabilities, Future Minimum Payments Due 98.3  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months 62.8  
Other Liabilities, Future Minimum Payments, Due in Two Years 5.8  
Other Liabilities, Future Minimum Payments, Due in Three Years 5.2  
Other Liabilities, Future Minimum Payments, Due in Four Years 5.2  
Other Liabilities, Future Minimum Payments, Due in Five Years 5.2  
Other Liabilities, Future Minimum Payments, Due Thereafter 14.1  
Total Future Contractual Obligations Due 19,944.9  
Total Future Contractual Obligations Due, Next Twelve Months 1,388.6  
Total Future Contractual Obligations, Due in Two Years 2,315.6  
Total Future Contractual Obligations, Due in Three Years 877.8  
Total Future Contractual Obligations, Due in Four Years 1,912.5  
Total Future Contractual Obligations, Due in Five Years 1,594.0  
Total Future Contractual Obligations, Due Thereafter 11,856.4  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (81.1) $ (76.1)
Finance Lease, Liability, Undiscounted Excess Amount (116.4)  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ (5.6)