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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Decrease (increase) in:      
Accounts receivable - trade $ 460.9 $ 80.3  
Accounts receivable - related parties 0.6 (43.4)  
Inventories (46.6) (235.0)  
Prepaid and other current assets (50.5) (64.3)  
Other assets 3.6 21.5  
Increase (decrease) in:      
Accounts payable - trade 3.4 (32.5)  
Accounts payable - related parties (3.4) (36.5)  
Accrued product payables (559.4) (0.6)  
Accrued interest 14.5 15.3  
Other current liabilities (83.0) 90.0  
Other liabilities 9.2 6.6  
Net effect of changes in operating accounts (250.7) (198.6)  
Liability for construction in progress expenditures 389.7   $ 372.8
Significant Acquisitions and Disposals [Line Items]      
Proceeds from asset sales and insurance recoveries 5.9 113.2  
Net gains (losses) attributable to asset sales and insurance recoveries (2.4) 96.4  
West Storage Facilities [Member]      
Significant Acquisitions and Disposals [Line Items]      
Proceeds from asset sales and insurance recoveries 0.0 95.0  
Net gains (losses) attributable to asset sales and insurance recoveries 0.0 95.0  
Other Disposal of Assets [Member]      
Significant Acquisitions and Disposals [Line Items]      
Proceeds from asset sales and insurance recoveries 5.9 18.2  
Net gains (losses) attributable to asset sales and insurance recoveries $ (2.4) $ 1.4