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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Decrease (increase) in:      
Accounts receivable - trade $ (106.8) $ 110.1  
Accounts receivable - related parties (0.8) (0.6)  
Inventories (19.5) (71.9)  
Prepaid and other current assets (71.9) 249.0  
Other assets (10.3) (2.2)  
Increase (decrease) in:      
Accounts payable - trade (53.1) 6.5  
Accounts payable - related parties (0.9) (21.1)  
Accrued product payables 328.4 (16.8)  
Accrued interest (147.3) (137.9)  
Other current liabilities (106.9) (400.2)  
Other liabilities (14.0) (3.7)  
Net effect of changes in operating accounts (203.1) (288.8)  
Liability for construction in progress expenditures 331.9   $ 373.0
Contributions in aid of construction costs $ 0.0 $ 15.6