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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt $ 834,400,000 $ 910,200,000
Assets:    
Derivative assets 315,500,000 312,000,000.0
Liabilities:    
Derivative liabilities 320,100,000 332,500,000
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 308,000,000.0 303,600,000
Liabilities:    
Derivative liabilities 307,000,000.0 323,900,000
Foreign currency contracts    
Assets:    
Derivative assets 7,500,000 8,500,000
Liabilities:    
Derivative liabilities 13,200,000 8,700,000
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 321,300,000 317,700,000
Liabilities:    
Total liabilities at fair value 320,100,000 332,500,000
Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 5,800,000 5,600,000
Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 308,000,000.0 303,600,000
Liabilities:    
Derivative liabilities 307,000,000.0 323,900,000
Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 7,500,000 8,500,000
Liabilities:    
Derivative liabilities 13,200,000 8,700,000
Level 1 Inputs | Fair value measured on recurring basis    
Assets:    
Total assets at fair value 179,900,000 196,300,000
Liabilities:    
Total liabilities at fair value 187,800,000 210,600,000
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 179,900,000 196,300,000
Liabilities:    
Derivative liabilities 187,800,000 210,600,000
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 and liabilities measured at estimated fair value on a recurring basis    
Debt 834,400,000 910,200,000
Notes receivable 44,700,000 44,900,000
Assets:    
Total assets at fair value 140,300,000 120,200,000
Liabilities:    
Total liabilities at fair value 131,700,000 120,500,000
Level 2 Inputs | Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 5,800,000 5,600,000
Level 2 Inputs | Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 127,000,000.0 106,100,000
Liabilities:    
Derivative liabilities 118,500,000 111,800,000
Level 2 Inputs | Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 7,500,000 8,500,000
Liabilities:    
Derivative liabilities 13,200,000 8,700,000
Level 3 Inputs | Fair value measured on recurring basis    
Assets:    
Total assets at fair value 1,100,000 1,200,000
Liabilities:    
Total liabilities at fair value 700,000 1,400,000
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 1,100,000 1,200,000
Liabilities:    
Derivative liabilities 700,000 1,400,000
Level 3 Inputs | Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities $ 0 $ 0