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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Decrease (increase) in:      
Accounts receivable - trade $ 1,702.4 $ (653.0)  
Accounts receivable - related parties 0.5 2.0  
Inventories 507.7 (84.5)  
Prepaid and other current assets 1,001.7 (223.4)  
Other assets 22.7 (13.2)  
Increase (decrease) in:      
Accounts payable - trade 22.4 (35.7)  
Accounts payable - related parties (93.0) (7.9)  
Accrued product payables (1,743.1) 673.0  
Accrued interest (193.4) (178.7)  
Other current liabilities (896.4) (8.4)  
Other liabilities 10.2 (30.0)  
Net effect of changes in operating accounts 341.7 $ (559.8)  
Liability for construction in progress expenditures $ 394.0   $ 432.0