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Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Feb. 09, 2021
Feb. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
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     0.0  
Long-term Debt, Future Minimum Payments, Due in Two Years     30.0  
Long-term Debt, Future Minimum Payments, Due in Three Years     0.0  
Long-term Debt, Future Minimum Payments, Due in Four Years     0.0  
Long-term Debt, Future Minimum Payments, Due in Five Years     1,260.0  
Long-term Debt, Future Minimum Payments, Due Thereafter     7,845.0  
Interest Payments on Long-term Debt, Future Minimum Payments Due     6,046.3  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months     336.3  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years     335.7  
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     334.1  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter     4,372.0  
Finance Leases, Future Minimum Payments Due     264.7  
Finance Leases, Future Minimum Payments Due, Next Twelve Months     32.7  
Finance Leases, Future Minimum Payments Due in Two Years     32.2  
Finance Leases, Future Minimum Payments Due in Three Years     28.8  
Finance Leases, Future Minimum Payments Due in Four Years     20.8  
Finance Leases, Future Minimum Payments Due in Five Years     16.1  
Finance Leases, Future Minimum Payments Due Thereafter     134.1  
Operating Leases, Future Minimum Payments Due     48.0  
Operating Leases, Future Minimum Payments Due, Next Twelve Months     11.7  
Operating Leases, Future Minimum Payments, Due in Two Years     5.2  
Operating Leases, Future Minimum Payments, Due in Three Years     4.7  
Operating Leases, Future Minimum Payments, Due in Four Years     4.5  
Operating Leases, Future Minimum Payments, Due in Five Years     3.7  
Operating Leases, Future Minimum Payments, Due Thereafter     18.2  
Energy Commodity Contracts, Future Minimum Payments Due     42.1  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months     42.1  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years     0.0  
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     1,495.6  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months     468.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years     422.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years     256.0  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years     150.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years     56.2  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter     141.7  
Service Obligations, IT Service Obligations, Future Minimum Payments Due     240.3  
Service Obligations, IT Service Obligations, Future Minimum Payments Due, Next Twelve Months     74.9  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Two Years     74.0  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Three Years     38.1  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Four Years     30.5  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due in Five Years     22.8  
Service Obligations, IT Service Obligations, Future Minimum Payments, Due Thereafter     0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments Due     12.6  
Service Obligations, Other Service Obligations, Future Minimum Payments Due, Next Twelve Months     12.6  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Two Years     0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Three Years     0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Four Years     0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Five Years     0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due Thereafter     0.0  
Other Liabilities, Future Minimum Payments Due     116.9  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months     26.0  
Other Liabilities, Future Minimum Payments, Due in Two Years     0.8  
Other Liabilities, Future Minimum Payments, Due in Three Years     90.1  
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 Minimum Lease Payments Due     17,401.5  
Total Future Minimum Lease Payments Due, Next Twelve Months     1,005.0  
Total Future Minimum Lease Payments, Due in Two Years     900.4  
Total Future Minimum Lease Payments, Due in Three Years     751.8  
Total Future Minimum Lease Payments, Due in Four Years     540.4  
Total Future Minimum Lease Payments, Due in Five Years     1,692.9  
Total Future Minimum Lease Payments, Due Thereafter     12,511.0  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net     (86.9) $ (70.5)
Finance Leases, Future Minimum Payments, Interest Included in Payments     69.7  
Operating Leases, Future Minimum Payaments, Interest Included in Payments     7.8  
Subsequent Event        
Long-term Purchase Commitment [Line Items]        
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due   $ 638.6    
Service Obligations, Other Service Obligations, Future Minimum Payments Due $ 12.1      
Fleet Lease        
Long-term Purchase Commitment [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months     30.0  
Operating Leases, Future Minimum Payments, Due in Two Years     27.7  
Operating Leases, Future Minimum Payments, Due in Three Years     24.9  
Operating Leases, Future Minimum Payments, Due in Four Years     22.0  
Operating Leases, Future Minimum Payments, Due in Five Years     19.0  
Operating Leases, Future Minimum Payments, Due Thereafter     $ 21.5