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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross Amounts Recognized | $ 559.1 | $ 312.0
Gross Amounts Offset | 475.4 | 235.2
Net Amounts Presented | 83.7 | 76.9
Cash Collateral | 0.0 | 21.2
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | 83.7 | 55.7
Offsetting Liabilities [Line Items] |  |
Gross Amounts Recognized | 581.6 | 332.5
Gross Amounts Offset | 475.4 | 235.2
Net Amounts Presented | 106.2 | 97.4
Cash Collateral | 0.0 | 39.2
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | 106.2 | 58.2
Commodity contracts |  |
Offsetting Assets [Line Items] |  |
Gross Amounts Recognized | 556.7 | 303.6
Gross Amounts Offset | 474.2 | 228.4
Net Amounts Presented | 82.5 | 75.1
Cash Collateral | 0.0 | 21.2
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | 82.5 | 53.9
Offsetting Liabilities [Line Items] |  |
Gross Amounts Recognized | 579.0 | 323.9
Gross Amounts Offset | 474.2 | 228.4
Net Amounts Presented | 104.8 | 95.4
Cash Collateral | 0.0 | 39.2
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | 104.8 | 56.2
Foreign currency contracts |  |
Offsetting Assets [Line Items] |  |
Gross Amounts Recognized | 2.4 | 8.5
Gross Amounts Offset | 1.2 | 6.7
Net Amounts Presented | 1.2 | 1.7
Cash Collateral | 0.0 | 0.0
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | 1.2 | 1.7
Offsetting Liabilities [Line Items] |  |
Gross Amounts Recognized | 2.6 | 8.7
Gross Amounts Offset | 1.2 | 6.7
Net Amounts Presented | 1.4 | 2.0
Cash Collateral | 0.0 | 0.0
Gross Amounts without Right of Offset | 0.0 | 0.0
Net Amounts | $ 1.4 | $ 2.0

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