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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt $ 1,067,800,000 $ 1,186,300,000
Assets:    
Derivative assets 243,200,000 347,200,000
Liabilities:    
Derivative liabilities 212,800,000 332,500,000
Transfers from Level 1 to Level 2, assets 0 0
Transfers from Level 2 to Level 1, assets 0 0
Transfers from Level 1 to Level 2, liabilities 0 0
Transfers from Level 2 to Level 1, liabilities 0 0
Commodity contracts    
Assets:    
Derivative assets 233,300,000 331,200,000
Liabilities:    
Derivative liabilities 198,800,000 326,100,000
Foreign currency contracts    
Assets:    
Derivative assets 9,900,000 16,000,000.0
Liabilities:    
Derivative liabilities 14,000,000.0 6,400,000
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 248,300,000 351,200,000
Liabilities:    
Total liabilities at fair value 212,800,000 332,500,000
Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 5,100,000 4,000,000.0
Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 233,300,000 331,200,000
Liabilities:    
Derivative liabilities 198,800,000 326,100,000
Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 9,900,000 16,000,000.0
Liabilities:    
Derivative liabilities 14,000,000.0 6,400,000
Level 1 Inputs | Fair value measured on recurring basis    
Assets:    
Total assets at fair value 168,000,000.0 273,600,000
Liabilities:    
Total liabilities at fair value 163,000,000.0 236,600,000
Level 1 Inputs | Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 0 0
Level 1 Inputs | Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 168,000,000.0 273,600,000
Liabilities:    
Derivative liabilities 163,000,000.0 236,600,000
Level 1 Inputs | Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Level 2 Inputs | Fair value measured on recurring basis    
Assets:    
Total assets at fair value 77,000,000.0 75,300,000
Liabilities:    
Total liabilities at fair value 49,600,000 95,200,000
Level 2 Inputs | Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 5,100,000 4,000,000.0
Level 2 Inputs | Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 62,000,000.0 55,300,000
Liabilities:    
Derivative liabilities 35,700,000 88,800,000
Level 2 Inputs | Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 9,900,000 16,000,000.0
Liabilities:    
Derivative liabilities 14,000,000.0 6,400,000
Level 3 Inputs | Fair value measured on recurring basis    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 1,100,000,000 1,200,000,000
Notes receivable 29,900,000 16,900,000
Assets:    
Total assets at fair value 3,300,000 2,300,000
Liabilities:    
Total liabilities at fair value 100,000 700,000
Level 3 Inputs | Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 0 0
Level 3 Inputs | Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 3,300,000 2,300,000
Liabilities:    
Derivative liabilities 100,000 700,000
Level 3 Inputs | Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities $ 0 $ 0