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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset $ 522.9 $ 695.3
Netting and collateral, asset (283.1) (380.0)
Total Assets 242.2 317.5
Derivative liability 468.7 649.6
Inventories liability 14.3  
Netting and collateral, liability (393.7) (607.6)
Total, inventories liability   22.9
Total Liabilities 89.3 64.9
Debt 772.2 689.9
Level 1    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 255.4 173.7
Subtotal Liabilities 340.1 306.4
Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 266.7 519.6
Inventories liability 14.3 22.9
Subtotal Liabilities 142.7 364.8
Assets and liabilities measured at estimated fair value on a nonrecurring basis    
Fair value of inventory disposal group 4.2  
Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 3.2 4.2
Subtotal Liabilities 0.2 1.3
Assets and liabilities measured at estimated fair value on a nonrecurring basis    
Fair value of asset disposal group, excluding inventory 37.8  
Fair value of liability disposal group 10.6  
Cash surrender value of life insurance    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 2.4 2.2
Cash surrender value of life insurance | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Investments 2.4 2.2
Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Subtotal Assets 525.3 697.5
Inventories liability 14.3 22.9
Subtotal Liabilities 483.0 672.5
Fair value measured on recurring basis | Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 746.6 689.9
Notes receivable 7.4 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 2.4 2.2
Commodity contracts    
Assets and liabilities measured at estimated fair value on a recurring basis    
Netting and collateral, derivative asset (279.0) (368.0)
Total, derivative asset 231.5 305.5
Netting and collateral, derivative liability (389.6) (595.6)
Total, derivative liability 74.1 42.0
Commodity contracts | Level 1    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 255.4 173.7
Derivative liability 340.1 306.4
Commodity contracts | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 251.9 495.6
Derivative liability 123.4 329.9
Commodity contracts | Level 3    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 3.2 4.2
Derivative liability 0.2 1.3
Commodity contracts | Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 510.5 673.5
Derivative liability 463.7 637.6
Foreign currency contracts    
Assets and liabilities measured at estimated fair value on a recurring basis    
Netting and collateral, derivative asset (4.1) (12.0)
Total, derivative asset 8.3 9.8
Netting and collateral, derivative liability (4.1) (12.0)
Total, derivative liability 0.9  
Foreign currency contracts | Level 2    
Assets and liabilities measured at estimated fair value on a recurring basis    
Derivative asset 12.4 21.8
Derivative liability 5.0 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 12.4 21.8
Derivative liability $ 5.0 $ 12.0