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Other Commitments And Contingencies Other Commitments and Contingencies (Contractual Obligation, Fiscal Year Maturity Schedule) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Long-term Purchase Commitment [Line Items]    
Long-term Debt, Future Minimum Payments Due [1] $ 7,029.6  
Long-term Debt, Future Minimum Payments Due, Next Twelve Months [1] 41.0  
Long-term Debt, Future Minimum Payments, Due in Two Years [1] 0.0  
Long-term Debt, Future Minimum Payments, Due in Three Years [1] 63.6  
Long-term Debt, Future Minimum Payments, Due in Four Years [1] 530.0  
Long-term Debt, Future Minimum Payments, Due in Five Years [1] 600.0  
Long-term Debt, Future Minimum Payments, Due Thereafter [1] 5,795.0  
Capital Leases, Future Minimum Payments Due [2] 322.4  
Capital Leases, Future Minimum Payments Due, Next Twelve Months [2] 23.0  
Capital Leases, Future Minimum Payments Due in Two Years [2] 22.5  
Capital Leases, Future Minimum Payments Due in Three Years [2] 22.6  
Capital Leases, Future Minimum Payments Due in Four Years [2] 22.1  
Capital Leases, Future Minimum Payments Due in Five Years [2] 19.8  
Capital Leases, Future Minimum Payments Due Thereafter [2] 212.4  
Interest Payments on Long-term Debt, Future Minimum Payments Due 6,311.7  
Interest Payments on Long-term Debt, Future Minimum Payments Due, Next Twelve Months 319.8  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Two Years 318.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Three Years 318.6  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Four Years 315.0  
Interest Payments on Long-term Debt, Future Minimum Payments, Due in Five Years 289.0  
Interest Payments on Long-term Debt, Future Minimum Payments, Due Thereafter 4,750.7  
Operating Leases, Future Minimum Payments Due [3] 45.9  
Operating Leases, Future Minimum Payments Due, Next Twelve Months [3] 11.0  
Operating Leases, Future Minimum Payments, Due in Two Years [3] 7.3  
Operating Leases, Future Minimum Payments, Due in Three Years [3] 6.1  
Operating Leases, Future Minimum Payments, Due in Four Years [3] 4.2  
Operating Leases, Future Minimum Payments, Due in Five Years [3] 2.8  
Operating Leases, Future Minimum Payments, Due Thereafter [3] 14.5  
Energy Commodity Contracts, Future Minimum Payments Due 154.3  
Energy Commodity Contracts, Future Minimum Payments Due, Next Twelve Months 99.2  
Energy Commodity Contracts, Future Minimum Payments, Due in Two Years 55.1  
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 3,566.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments Due, Next Twelve Months 592.3  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Two Years 487.7  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Three Years 450.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Four Years 437.5  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due in Five Years 260.8  
Service Obligations, Pipeline Service Obligations, Future Minimum Payments, Due Thereafter 1,337.9  
Service Obligations, IBM Service Obligations, Future Minimum Payments Due 211.0  
Service Obligations, IBM Service Obligations, Future Minimum Payments Due, Next Twelve Months 68.3  
Service Obligations, IBM Service Obligations, Future Minimum Payments, Due in Two Years 60.0  
Service Obligations, IBM Service Obligations, Future Minimum Payments, Due in Three Years 47.1  
Service Obligations, IBM Service Obligations, Future Minimum Payments, Due in Four Years 35.6  
Service Obligations, IBM Service Obligations, Future Minimum Payments, Due in Five Years 0.0  
Service Obligations, IBM Service Obligations, Future Minimum Payments, Due Thereafter 0.0  
Service Obligations, Other Service Obligations, Future Minimum Payments Due 86.7  
Service Obligations, Other Service Obligations, Future Minimum Payments Due, Next Twelve Months 33.5  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Two Years 43.6  
Service Obligations, Other Service Obligations, Future Minimum Payments, Due in Three Years 9.6  
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 24.2  
Other Liabilities, Future Minimum Payments Due, Next Twelve Months 24.2  
Other Liabilities, Future Minimum Payments, Due in Two Years 0.0  
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 Minimum Lease Payments Due 17,752.5  
Total Future Minimum Lease Payments Due, Next Twelve Months 1,212.3  
Total Future Minimum Lease Payments, Due in Two Years 994.8  
Total Future Minimum Lease Payments, Due in Three Years 918.1  
Total Future Minimum Lease Payments, Due in Four Years 1,344.4  
Total Future Minimum Lease Payments, Due in Five Years 1,172.4  
Total Future Minimum Lease Payments, Due Thereafter 12,110.5  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (68.5) $ (71.5)
Capital Leases, Future Minimum Payments, Interest Included in Payments 114.6  
Accrual for Environmental Loss Contingencies 101.2 $ 111.4
Fleet Lease    
Long-term Purchase Commitment [Line Items]    
Operating Leases, Future Minimum Payments Due, Next Twelve Months 26.7  
Operating Leases, Future Minimum Payments, Due in Two Years 22.4  
Operating Leases, Future Minimum Payments, Due in Three Years 16.6  
Operating Leases, Future Minimum Payments, Due in Four Years 12.3  
Operating Leases, Future Minimum Payments, Due in Five Years 9.3  
Operating Leases, Future Minimum Payments, Due Thereafter $ 8.8  
[1] Long-term debt balance excludes unamortized issuance costs and discounts of $68.5 million.
[2] Capital lease payments shown above are inclusive of interest totaling $114.6 million.
[3] Operating lease balances do not include amounts for fleet leases that can be renewed beyond the initial lease term. The Company anticipates renewing the leases beyond the initial term, but the anticipated payments associated with the renewals do not meet the definition of expected minimum lease payments and therefore are not included above. Expected payments are $26.7 million in 2019, $22.4 million in 2020, $16.6 million in 2021, $12.3 million in 2022, $9.3 million in 2023 and $8.8 million thereafter.