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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Decrease (increase) in:          
Accounts receivable - trade     $ (370.4) $ 1,042.5  
Accounts receivable - related parties     (0.2) 1.2  
Inventories     (701.6) (143.2)  
Prepaid and other current assets     (71.8) (32.7)  
Other assets     (1.3) 2.1  
Increase (decrease) in:          
Accounts payable - trade     (36.8) (72.7)  
Accounts payable - related parties     13.6 (38.6)  
Accrued product payables     615.1 (1,248.4)  
Accrued interest     (149.5) (136.7)  
Other current liabilities     201.1 (13.8)  
Other liabilities     12.1 12.4  
Net effect of changes in operating accounts     (489.7) (627.9)  
Liability for construction in progress expenditures     166.5   $ 472.8
Business Acquisition [Line Items]          
Cash used for business combinations     1,000.0 1,045.1  
Significant Acquisitions and Disposals [Line Items]          
Proceeds from asset sales and insurance recoveries     43.9 1,537.3  
Net gains (losses) attributable to asset sales     2.3 (14.7)  
Offshore Business [Member]          
Significant Acquisitions and Disposals [Line Items]          
Proceeds from asset sales and insurance recoveries     0.0 1,528.6  
Net gains (losses) attributable to asset sales     0.0 (12.6)  
Other Disposal of Assets [Member]          
Significant Acquisitions and Disposals [Line Items]          
Proceeds from asset sales and insurance recoveries     43.9 8.7  
Net gains (losses) attributable to asset sales     $ 2.3 $ (2.1)  
Eagle Ford Midstream Assets [Member]          
Business Acquisition [Line Items]          
Total purchase price of business combination   $ 2,100.0      
Cash used for business combinations $ 1,000.0 $ 1,100.0