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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | $ 910,200,000 | $ 1,186,300,000
Total derivative assets | 312,000,000.0 | 347,200,000
Gross Amounts Recognized | 332,500,000 | 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 |  |
Total derivative assets | 303,600,000 | 331,200,000
Gross Amounts Recognized | 323,900,000 | 326,100,000
Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 8,500,000 | 16,000,000.0
Gross Amounts Recognized | 8,700,000 | 6,400,000
Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 317,700,000 | 351,200,000
Total liabilities | 332,500,000 | 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 | 5,600,000 | 4,000,000.0
Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 303,600,000 | 331,200,000
Gross Amounts Recognized | 323,900,000 | 326,100,000
Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 8,500,000 | 16,000,000.0
Gross Amounts Recognized | 8,700,000 | 6,400,000
Level 1 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 196,300,000 | 273,600,000
Total liabilities | 210,600,000 | 236,600,000
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 |  |
Total derivative assets | 196,300,000 | 273,600,000
Gross Amounts Recognized | 210,600,000 | 236,600,000
Level 1 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 0 | 0
Gross Amounts Recognized | 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 | 5,600,000 |
Level 2 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | 900,000,000 | 1,200,000,000
Notes receivable | 44,900,000 | 16,900,000
Total assets | 120,200,000 | 75,300,000
Total liabilities | 120,500,000 | 95,200,000
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 |  | 4,000,000.0
Level 2 | Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 106,100,000 | 55,300,000
Gross Amounts Recognized | 111,800,000 | 88,800,000
Level 2 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 8,500,000 | 16,000,000.0
Gross Amounts Recognized | 8,700,000 | 6,400,000
Level 3 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 1,200,000 | 2,300,000
Total liabilities | 1,400,000 | 700,000
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 |  |
Total derivative assets | 1,200,000 | 2,300,000
Gross Amounts Recognized | 1,400,000 | 700,000
Level 3 | Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 0 | 0
Gross Amounts Recognized | $ 0 | $ 0

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