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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash:    
Interest paid, net of capitalized interest [1] $ 182.6 $ 171.8
Income taxes (received) paid, net 1.0 (44.4)
Non-cash investing activities:    
Transfers from materials and supplies inventory to property, plant and equipment 0.4 1.8
Non-cash financing activities:    
Changes in accrued distributions to noncontrolling interests (27.7) (1.9)
Retained Earnings [Member]    
Non-cash investing activities:    
Impact of capital expenditure accruals on property, plant and equipment, net $ (0.3) $ (143.9)
[1] Interest capitalized on major projects was $1.7 million and $22.5 million for the six months ended June 30, 2021 and 2020.