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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Long-term Purchase Commitment [Line Items]    
Long-term Debt, Future Minimum Payments Due $ 9,135.0  
Long-term Debt, Future Minimum Payments Due, Next Twelve Months 30.0  
Long-term Debt, Future Minimum Payments, Due in Two Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Three Years 0.0  
Long-term Debt, Future Minimum Payments, Due in Four Years 1,260.0  
Long-term Debt, Future Minimum Payments, Due in Five Years 0.0  
Long-term Debt, Future Minimum Payments, Due Thereafter 7,845.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due 5,710.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months 335.7  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years 334.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years 334.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years 334.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years 321.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter 4,050.4  
Finance Leases, Future Minimum Payments Due 244.3  
Finance Leases, Future Minimum Payments Due, Next Twelve Months 37.2  
Finance Leases, Future Minimum Payments Due in Two Years 33.6  
Finance Leases, Future Minimum Payments Due in Three Years 25.6  
Finance Leases, Future Minimum Payments Due in Four Years 19.2  
Finance Leases, Future Minimum Payments Due in Five Years 15.8  
Finance Leases, Future Minimum Payments Due Thereafter 112.9  
Operating Leases, Future Minimum Payments Due 41.4  
Operating Leases, Future Minimum Payments Due, Next Twelve Months 7.9  
Operating Leases, Future Minimum Payments, Due in Two Years 4.9  
Operating Leases, Future Minimum Payments, Due in Three Years 4.6  
Operating Leases, Future Minimum Payments, Due in Four Years 4.0  
Operating Leases, Future Minimum Payments, Due in Five Years 3.8  
Operating Leases, Future Minimum Payments, Due Thereafter 16.2  
Energy Commodity Contracts, Future Minimum Payments Due 68.6  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months 60.4  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years 8.2  
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 1,605.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months 610.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years 366.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years 241.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years 136.1  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years 98.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter 152.7  
Service Obligations, IT Service Obligations, Future Minimum Payments Due 180.1  
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months 69.5  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years 44.8  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years 35.7  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years 27.6  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years 2.5  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter 0.0  
Other Liabilities, Future Minimum Payments Due 553.0  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months 95.6  
Other Liabilities, Future Minimum Payments, Due in Two Years 457.4  
Other Liabilities, Future Minimum Payments, Due in Three Years 0.0  
Other Liabilities, Future Minimum Payments, Due in Four Years 0.0  
Other Liabilities, Future Minimum Payments, Due in Five Years 0.0  
Other Liabilities, Future Minimum Payments, Due Thereafter 0.0  
Total Future Contractual Obligations Due 17,537.4  
Total Future Contractual Obligations Due, Next Twelve Months 1,246.8  
Total Future Contractual Obligations, Due in Two Years 1,249.0  
Total Future Contractual Obligations, Due in Three Years 641.0  
Total Future Contractual Obligations, Due in Four Years 1,781.0  
Total Future Contractual Obligations, Due in Five Years 442.4  
Total Future Contractual Obligations, Due Thereafter 12,177.2  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (79.1) $ (86.9)
Finance Lease, Liability, Undiscounted Excess Amount (58.7)  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (6.8)  
Other Commitment, to be Paid, Year One 33.3  
Other Commitment, to be Paid, Year Two 30.2  
Other Commitment, to be Paid, Year Three 27.2  
Other Commitment, to be Paid, Year Four 24.0  
Other Commitment, to be Paid, Year Five 17.0  
Other Commitment, to be Paid, after Year Five $ 16.1