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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Assets:    
Derivative assets $ 395,000,000.0 $ 845,800,000
Liabilities:    
Derivative liabilities 398,700,000 769,100,000
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 393,000,000.0 841,200,000
Liabilities:    
Derivative liabilities 394,800,000 767,900,000
Foreign currency contracts    
Assets:    
Derivative assets 2,100,000 4,600,000
Liabilities:    
Derivative liabilities 3,800,000 1,200,000
Fair value measured on recurring basis    
Assets:    
Total assets at fair value 403,100,000 852,100,000
Liabilities:    
Total liabilities at fair value 398,700,000 769,100,000
Fair value measured on recurring basis | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 8,000,000.0 6,300,000
Fair value measured on recurring basis | Commodity contracts    
Assets:    
Derivative assets 393,000,000.0 841,200,000
Liabilities:    
Derivative liabilities 394,800,000 767,900,000
Fair value measured on recurring basis | Foreign currency contracts    
Assets:    
Derivative assets 2,100,000 4,600,000
Liabilities:    
Derivative liabilities 3,800,000 1,200,000
Fair value measured on recurring basis | Level 1 Inputs    
Assets:    
Total assets at fair value 282,200,000 585,600,000
Liabilities:    
Total liabilities at fair value 302,100,000 556,500,000
Fair value measured on recurring basis | Level 1 Inputs | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 0 0
Fair value measured on recurring basis | Level 1 Inputs | Commodity contracts    
Assets:    
Derivative assets 282,200,000 585,600,000
Liabilities:    
Derivative liabilities 302,100,000 556,500,000
Fair value measured on recurring basis | Level 1 Inputs | Foreign currency contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Fair value measured on recurring basis | Level 2 Inputs    
Assets and liabilities measured at estimated fair value on a recurring basis    
Debt 700,000,000 700,000,000
Notes receivable 27,500,000 28,200,000
Assets:    
Total assets at fair value 116,400,000 265,600,000
Liabilities:    
Total liabilities at fair value 95,400,000 212,400,000
Fair value measured on recurring basis | Level 2 Inputs | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 8,000,000.0 6,300,000
Fair value measured on recurring basis | Level 2 Inputs | Commodity contracts    
Assets:    
Derivative assets 106,200,000 254,600,000
Liabilities:    
Derivative liabilities 91,500,000 211,200,000
Fair value measured on recurring basis | Level 2 Inputs | Foreign currency contracts    
Assets:    
Derivative assets 2,100,000 4,600,000
Liabilities:    
Derivative liabilities 3,800,000 1,200,000
Fair value measured on recurring basis | Level 3 Inputs    
Assets:    
Total assets at fair value 4,500,000 900,000
Liabilities:    
Total liabilities at fair value 1,200,000 200,000
Fair value measured on recurring basis | Level 3 Inputs | Cash surrender value of life insurance    
Assets:    
Cash surrender value of life insurance 0 0
Fair value measured on recurring basis | Level 3 Inputs | Commodity contracts    
Assets:    
Derivative assets 4,500,000 900,000
Liabilities:    
Derivative liabilities 1,200,000 200,000
Fair value measured on recurring basis | Level 3 Inputs | Foreign currency contracts    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities $ 0 $ 0