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Fair Value Measurements - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | $ 1,186.3 | $ 772.2
Total derivative assets | 347.2 | 529.6
Gross Amounts Recognized | 332.5 | 468.5
Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 331.2 | 517.3
Gross Amounts Recognized | 326.1 | 463.4
Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 16.0 | 12.4
Gross Amounts Recognized | 6.4 | 5.0
Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 351.2 | 532.1
Total liabilities | 332.5 | 468.5
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 | 4.0 | 2.4
Fair value measured on recurring basis | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 331.2 | 517.3
Gross Amounts Recognized | 326.1 | 463.4
Fair value measured on recurring basis | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 16.0 | 12.4
Gross Amounts Recognized | 6.4 | 5.0
Level 1 |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 273.6 | 262.0
Total liabilities | 236.6 | 339.8
Level 1 | 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 | 0.0
Level 1 | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 273.6 | 262.0
Gross Amounts Recognized | 236.6 | 339.8
Level 1 | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 0.0 | 0.0
Gross Amounts Recognized | 0.0 | 0.0
Level 2 |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 75.3 | 266.8
Total liabilities | 95.2 | 128.4
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 | 4.0 | 2.4
Level 2 | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 55.3 | 252.0
Gross Amounts Recognized | 88.8 | 123.4
Level 2 | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 16.0 | 12.4
Gross Amounts Recognized | 6.4 | 5.0
Level 3 |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total assets | 2.3 | 3.3
Total liabilities | 0.7 | 0.2
Level 3 | 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 | 0.0
Level 3 | Commodity contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 2.3 | 3.3
Gross Amounts Recognized | 0.7 | 0.2
Level 3 | Foreign currency contracts |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Total derivative assets | 0.0 | 0.0
Gross Amounts Recognized | 0.0 | 0.0
Level 3 | Fair value measured on recurring basis |  |
Assets and liabilities measured at estimated fair value on a recurring basis |  |
Debt | 1,200.0 | 772.2
Notes receivable | $ 16.9 | $ 12.7

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