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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | $ 765,300,000 | $ 910,200,000
Assets: |  |
Derivative assets | 533,900,000 | 312,000,000.0
Liabilities: |  |
Derivative liabilities | 549,200,000 | 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 | 515,000,000.0 | 303,600,000
Liabilities: |  |
Derivative liabilities | 540,400,000 | 323,900,000
Foreign currency contracts |  |
Assets: |  |
Derivative assets | 18,900,000 | 8,500,000
Liabilities: |  |
Derivative liabilities | 8,800,000 | 8,700,000
Fair value measured on recurring basis |  |
Assets: |  |
Total assets at fair value | 540,000,000.0 | 317,700,000
Liabilities: |  |
Total liabilities at fair value | 549,200,000 | 332,500,000
Fair value measured on recurring basis | Cash surrender value of life insurance |  |
Assets: |  |
Cash surrender value of life insurance | 6,000,000.0 | 5,600,000
Fair value measured on recurring basis | Commodity contracts |  |
Assets: |  |
Derivative assets | 515,000,000.0 | 303,600,000
Liabilities: |  |
Derivative liabilities | 540,400,000 | 323,900,000
Fair value measured on recurring basis | Foreign currency contracts |  |
Assets: |  |
Derivative assets | 18,900,000 | 8,500,000
Liabilities: |  |
Derivative liabilities | 8,800,000 | 8,700,000
Level 1 Inputs | Fair value measured on recurring basis |  |
Assets: |  |
Total assets at fair value | 371,600,000 | 196,300,000
Liabilities: |  |
Total liabilities at fair value | 364,200,000 | 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 | 371,600,000 | 196,300,000
Liabilities: |  |
Derivative liabilities | 364,200,000 | 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 | 765,300,000 | 910,200,000
Notes receivable | 26,800,000 | 44,900,000
Assets: |  |
Total assets at fair value | 166,200,000 | 120,200,000
Liabilities: |  |
Total liabilities at fair value | 182,600,000 | 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 | 6,000,000.0 | 5,600,000
Level 2 Inputs | Fair value measured on recurring basis | Commodity contracts |  |
Assets: |  |
Derivative assets | 141,200,000 | 106,100,000
Liabilities: |  |
Derivative liabilities | 173,800,000 | 111,800,000
Level 2 Inputs | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets: |  |
Derivative assets | 18,900,000 | 8,500,000
Liabilities: |  |
Derivative liabilities | 8,800,000 | 8,700,000
Level 3 Inputs | Fair value measured on recurring basis |  |
Assets: |  |
Total assets at fair value | 2,200,000 | 1,200,000
Liabilities: |  |
Total liabilities at fair value | 2,400,000 | 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 | 2,200,000 | 1,200,000
Liabilities: |  |
Derivative liabilities | 2,400,000 | 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

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