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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | $ 701,000,000.0 | $ 910,200,000
Derivative assets | 845,800,000 | 312,000,000.0
Derivative liabilities | 769,100,000 | 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 and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 841,200,000 | 303,600,000
Derivative liabilities | 767,900,000 | 323,900,000
Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 4,600,000 | 8,500,000
Derivative liabilities | 1,200,000 | 8,700,000
Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 852,100,000 | 317,700,000
Total liabilities | 769,100,000 | 332,500,000
Fair value measured on recurring basis | Cash surrender value of life insurance |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Cash surrender value of life insurance | 6,300,000 | 5,600,000
Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 841,200,000 | 303,600,000
Derivative liabilities | 767,900,000 | 323,900,000
Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 4,600,000 | 8,500,000
Derivative liabilities | 1,200,000 | 8,700,000
Level 1 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 585,600,000 | 196,300,000
Total liabilities | 556,500,000 | 210,600,000
Level 1 | Fair value measured on recurring basis | Cash surrender value of life insurance |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Cash surrender value of life insurance | 0 | 0
Level 1 | Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 585,600,000 | 196,300,000
Derivative liabilities | 556,500,000 | 210,600,000
Level 1 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Level 2 | Cash surrender value of life insurance |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Cash surrender value of life insurance | 6,300,000 |
Level 2 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | 700,000,000 | 900,000,000
Notes receivable | 28,200,000 | 44,900,000
Total assets | 265,600,000 | 120,200,000
Total liabilities | 212,400,000 | 120,500,000
Level 2 | Fair value measured on recurring basis | Cash surrender value of life insurance |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Cash surrender value of life insurance |  | 5,600,000
Level 2 | Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 254,600,000 | 106,100,000
Derivative liabilities | 211,200,000 | 111,800,000
Level 2 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 4,600,000 | 8,500,000
Derivative liabilities | 1,200,000 | 8,700,000
Level 3 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 900,000 | 1,200,000
Total liabilities | 200,000 | 1,400,000
Level 3 | Fair value measured on recurring basis | Cash surrender value of life insurance |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Cash surrender value of life insurance | 0 | 0
Level 3 | Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 900,000 | 1,200,000
Derivative liabilities | 200,000 | 1,400,000
Level 3 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Derivative assets | 0 | 0
Derivative liabilities | $ 0 | $ 0

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