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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset $ 455.1 $ 695.3
Total, inventories asset 1.8  
Derivative liability 445.1 649.6
Total, inventories liability   22.9
Debt 884.4 689.9
Level 1    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 194.0 173.7
Subtotal Liabilities 311.2 306.4
Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Inventories asset 1.8  
Subtotal Assets 263.9 519.6
Inventories liability   22.9
Subtotal Liabilities 133.8 364.8
Assets and liabilities measured at estimated fair value on a nonrecurring basis    
Fair value of inventory disposal group 4.3  
Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 1.3 4.2
Subtotal Liabilities 0.1 1.3
Assets and liabilities measured at estimated fair value on a nonrecurring basis    
Fair value of asset disposal group, excluding inventory 34.1  
Fair value of liability disposal group 5.7  
Cash surrender value of life insurance | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 2.3 2.2
Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Inventories asset 1.8  
Subtotal Assets 459.2 697.5
Netting and collateral, asset (261.1) (380.0)
Total Assets 198.1 317.5
Inventories liability   22.9
Subtotal Liabilities 445.1 672.5
Netting and collateral, liability (395.9) (607.6)
Total Liabilities 49.2 64.9
Fair value measured on recurring basis | Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 884.4 689.9
Notes receivable 6.4 7.0
Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 2.3 2.2
Commodity contracts    
Assets and liabilities measured at estimated fair value on a recurring basis    
Total, derivative asset 189.3 305.5
Total, derivative liability 48.4 42.0
Commodity contracts | Level 1    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 194.0 173.7
Derivative liability 311.2 306.4
Commodity contracts | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 249.1 495.6
Derivative liability 127.0 329.9
Commodity contracts | Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 1.3 4.2
Derivative liability 0.1 1.3
Commodity contracts | Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 444.4 673.5
Netting and collateral, derivative asset (255.1) (368.0)
Total, derivative asset 189.3 305.5
Derivative liability 438.3 637.6
Netting and collateral, derivative liability (389.9) (595.6)
Total, derivative liability 48.4 42.0
Foreign currency contracts    
Assets and liabilities measured at estimated fair value on a recurring basis    
Total, derivative asset 4.7 9.8
Total, derivative liability 0.8  
Foreign currency contracts | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 10.7 21.8
Derivative liability 6.8 12.0
Foreign currency contracts | Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 10.7 21.8
Netting and collateral, derivative asset (6.0) (12.0)
Total, derivative asset 4.7 9.8
Derivative liability 6.8 12.0
Netting and collateral, derivative liability (6.0) $ (12.0)
Total, derivative liability $ 0.8