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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

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