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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash:      
Interest paid, net of capitalized interest [1] $ 374.1 $ 287.7 $ 217.2
Income taxes received, net of payments 43.7 (1.9) (0.5)
Non-cash investing activities:      
Deadstock commodity inventory transferred to property, plant and equipment 5.3 21.8 49.0
Transfers from materials and supplies inventory to property, plant and equipment 2.1 25.1 12.7
Contribution of property, plant and equipment to investments in unconsolidated affiliates     16.0
Change in ARO liability and property, plant and equipment due to revised cash flow estimate and additions (1.8) 6.7 1.8
Property, plant and equipment received in asset exchange     24.1
Receivable for asset exchange     15.0
Asset received related to conveyance of ownership interest in investment in unconsolidated affiliate     3.0
Non-cash financing activities:      
Changes in accrued distributions to noncontrolling interests (5.2) 91.7  
Reduction of Owner's Equity related to accrued dividends on unvested equity awards under share compensation arrangements 5.4 14.2 13.7
Accretion of deemed dividends on Series A Preferred Stock 37.6 33.1 29.2
Transfer within additional paid-in capital for exercise of Warrants     0.9
Impact of accounting standard adoption recorded in retained earnings     5.2
Non-cash balance sheet movements related to assets held for sale (See Note 4 - Joint Ventures, Acquisitions and Divestitures):      
Trade receivables   6.9  
Intangible assets, net accumulated amortization and estimated loss on sale   52.1  
Goodwill   1.4  
Property, plant and equipment, net of accumulated depreciation and estimated loss on sale   77.3  
Accounts payable and accrued liabilities   6.2  
Other long-term obligations   0.2  
Lease liabilities arising from recognition of right-of-use assets:      
Operating lease 13.2 6.9  
Finance lease 6.0 10.1  
Retained Earnings [Member]      
Non-cash investing activities:      
Impact of capital expenditure accruals on property, plant and equipment, net $ (226.9) $ (194.4) $ 216.2
[1] Interest capitalized on major projects was $33.0 million, $61.8 million and $46.3 million for the years ended December 31, 2020, 2019 and 2018.