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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Decrease (increase) in:      
Accounts receivable - trade $ 2,077.0 $ (124.8)  
Accounts receivable - related parties (0.1) (10.6)  
Inventories 161.4 (56.4)  
Prepaid and other current assets 906.2 (291.2)  
Other assets 87.7 (12.4)  
Increase (decrease) in:      
Accounts payable - trade 81.9 60.0  
Accounts payable - related parties (73.1) (21.0)  
Accrued product payables (2,119.4) 107.6  
Accrued interest 30.0 (3.3)  
Other current liabilities (1,142.3) 83.0  
Other liabilities (98.3) (62.9)  
Net effect of changes in operating accounts (89.0) $ (332.0)  
Liability for construction in progress expenditures $ 306.6   $ 432.0