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Fair Value Measurements - Assets and Liabilities (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Assets:
Derivative assets	$ 472,800,000	$ 845,800,000
Liabilities:
Derivative liabilities	436,800,000	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	461,400,000	841,200,000
Liabilities:
Derivative liabilities	433,900,000	767,900,000
Foreign currency contracts
Assets:
Derivative assets	11,400,000	4,600,000
Liabilities:
Derivative liabilities	2,900,000	1,200,000
Fair value measured on recurring basis
Assets:
Total assets at fair value	481,600,000	852,100,000
Liabilities:
Total liabilities at fair value	436,800,000	769,100,000
Fair value measured on recurring basis | Cash surrender value of life insurance
Assets:
Cash surrender value of life insurance	8,700,000	6,300,000
Fair value measured on recurring basis | Commodity contracts
Assets:
Derivative assets	461,400,000	841,200,000
Liabilities:
Derivative liabilities	433,900,000	767,900,000
Fair value measured on recurring basis | Foreign currency contracts
Assets:
Derivative assets	11,400,000	4,600,000
Liabilities:
Derivative liabilities	2,900,000	1,200,000
Fair value measured on recurring basis | Level 1 Inputs
Assets:
Total assets at fair value	346,000,000.0	585,600,000
Liabilities:
Total liabilities at fair value	352,300,000	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	346,000,000.0	585,600,000
Liabilities:
Derivative liabilities	352,300,000	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	20,500,000	28,200,000
Assets:
Total assets at fair value	119,200,000	265,600,000
Liabilities:
Total liabilities at fair value	74,000,000.0	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	8,700,000	6,300,000
Fair value measured on recurring basis | Level 2 Inputs | Commodity contracts
Assets:
Derivative assets	99,000,000.0	254,600,000
Liabilities:
Derivative liabilities	71,100,000	211,200,000
Fair value measured on recurring basis | Level 2 Inputs | Foreign currency contracts
Assets:
Derivative assets	11,400,000	4,600,000
Liabilities:
Derivative liabilities	2,900,000	1,200,000
Fair value measured on recurring basis | Level 3 Inputs
Assets:
Total assets at fair value	16,400,000	900,000
Liabilities:
Total liabilities at fair value	10,500,000	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	16,400,000	900,000
Liabilities:
Derivative liabilities	10,500,000	200,000
Fair value measured on recurring basis | Level 3 Inputs | Foreign currency contracts
Assets:
Derivative assets	0	0
Liabilities:
Derivative liabilities	$ 0	$ 0

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