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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Offsetting Assets [Line Items]    
Gross Amounts Recognized $ 315.5 $ 312.0
Gross Amounts Offset 245.8 235.2
Net Amounts Presented 69.7 76.9
Cash Collateral 0.0 21.2
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 69.7 55.7
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 320.1 332.5
Gross Amounts Offset 245.8 235.2
Net Amounts Presented 74.3 97.4
Cash Collateral 7.9 39.2
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 66.4 58.2
Commodity contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 308.0 303.6
Gross Amounts Offset 239.4 228.4
Net Amounts Presented 68.6 75.1
Cash Collateral 0.0 21.2
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 68.6 53.9
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 307.0 323.9
Gross Amounts Offset 239.4 228.4
Net Amounts Presented 67.6 95.4
Cash Collateral 7.9 39.2
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 59.7 56.2
Foreign currency contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 7.5 8.5
Gross Amounts Offset 6.4 6.7
Net Amounts Presented 1.1 1.7
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 1.1 1.7
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 13.2 8.7
Gross Amounts Offset 6.4 6.7
Net Amounts Presented 6.8 2.0
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts $ 6.8 $ 2.0