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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Decrease (increase) in:      
Accounts receivable - trade $ 602.7 $ (481.8)  
Accounts receivable - related parties (1.9) (0.6)  
Inventories 234.3 (618.7)  
Prepaid and other current assets 213.7 (51.3)  
Other assets (64.2) 0.5  
Increase (decrease) in:      
Accounts payable - trade 46.6 (7.0)  
Accounts payable - related parties (8.4) (5.3)  
Accrued product payables (694.2) 790.3  
Accrued interest (0.8) (1.2)  
Other current liabilities (252.4) 74.6  
Other liabilities 6.7 5.9  
Net effect of changes in operating accounts 82.1 $ (294.6)  
Liability for construction in progress expenditures $ 338.1   $ 124.3