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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Long-term Purchase Commitment [Line Items]    
Long-term Debt, Future Minimum Payments Due $ 9,455.0  
Long-term Debt, Future Minimum Payments Due, Next Twelve Months 0.0  
Long-term Debt, Future Minimum Payments, Due in Two Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Three Years 1,260.0  
Long-term Debt, Future Minimum Payments, Due in Four Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Five Years 1,090.0  
Long-term Debt, Future Minimum Payments, Due Thereafter 7,105.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due 5,890.4  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months 351.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years 351.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years 351.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years 339.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years 319.7  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter 4,176.8  
Finance Leases, Future Minimum Payments Due 226.5  
Finance Leases, Future Minimum Payments Due, Next Twelve Months 38.9  
Finance Leases, Future Minimum Payments Due in Two Years 30.9  
Finance Leases, Future Minimum Payments Due in Three Years 24.5  
Finance Leases, Future Minimum Payments Due in Four Years 19.4  
Finance Leases, Future Minimum Payments Due in Five Years 15.4  
Finance Leases, Future Minimum Payments Due Thereafter 97.4  
Operating Leases, Future Minimum Payments Due 43.3  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 7.9  
Operating Leases, Future Minimum Payments, Due in Two Years 6.4  
Operating Leases, Future Minimum Payments, Due in Three Years 5.8  
Operating Leases, Future Minimum Payments, Due in Four Years 5.3  
Operating Leases, Future Minimum Payments, Due in Five Years 4.5  
Operating Leases, Future Minimum Payments, Due Thereafter 13.4  
Energy Commodity Contracts, Future Minimum Payments Due 231.7  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months 119.7  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years 76.0  
Energy Commodity Contracts, Future Minimum Payments, Due in Three Years 36.0  
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 2,484.9  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months 642.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years 556.9  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years 410.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years 337.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years 328.8  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter 209.3  
Service Obligations, IT Service Obligations, Future Minimum Payments Due 177.4  
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months 71.9  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years 50.0  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years 41.3  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years 11.4  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years 2.8  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter 0.0  
Other Liabilities, Future Minimum Payments Due 654.2  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months 612.5  
Other Liabilities, Future Minimum Payments, Due in Two Years 6.2  
Other Liabilities, Future Minimum Payments, Due in Three Years 5.9  
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 19.2  
Total Future Contractual Obligations Due 19,163.4  
Total Future Contractual Obligations Due, Next Twelve Months 1,844.7  
Total Future Contractual Obligations, Due in Two Years 1,078.0  
Total Future Contractual Obligations, Due in Three Years 2,135.6  
Total Future Contractual Obligations, Due in Four Years 717.6  
Total Future Contractual Obligations, Due in Five Years 1,766.4  
Total Future Contractual Obligations, Due Thereafter 11,621.1  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (76.1) $ (79.1)
Finance Lease, Liability, Undiscounted Excess Amount (51.8)  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ (6.6)