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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Decrease (increase) in:      
Accounts receivable - trade $ 124.6 $ 837.5  
Accounts receivable - related parties 0.4 (0.6)  
Inventories (194.3) 161.0  
Prepaid and other current assets 5.3 (3.2)  
Other assets 1.3 0.5  
Increase (decrease) in:      
Accounts payable - trade (64.8) (61.6)  
Accounts payable - related parties (46.7) (69.6)  
Accrued product payables 228.7 (768.7)  
Accrued interest (158.2) (155.6)  
Other current liabilities (84.4) (71.9)  
Other liabilities 1.7 (6.8)  
Net effect of changes in operating accounts (186.4) (139.0)  
Liability for construction in progress expenditures 422.8   $ 472.8
Significant Disposals [Line Items]      
Proceeds from asset sales and insurance recoveries 13.4 0.5  
Net gains (losses) attributable to asset sales and insurance recoveries (4.9) 0.1  
Other Disposal of Assets [Member]      
Significant Disposals [Line Items]      
Proceeds from asset sales and insurance recoveries 13.4 0.5  
Net gains (losses) attributable to asset sales and insurance recoveries $ (4.9) $ 0.1