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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Offsetting Assets [Line Items]    
Gross Amounts Recognized $ 243.2 $ 347.2
Gross Amounts Offset 189.0 254.8
Net Amounts Presented 54.2 92.4
Cash Collateral 0.7 27.1
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 53.5 65.3
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 212.8 332.5
Gross Amounts Offset 189.0 254.8
Net Amounts Presented 23.8 77.7
Cash Collateral 1.6 2.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 22.2 75.7
Commodity contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 233.3 331.2
Gross Amounts Offset 179.8 249.7
Net Amounts Presented 53.5 81.5
Cash Collateral 0.7 27.1
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 52.8 54.5
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 198.8 326.1
Gross Amounts Offset 179.8 249.7
Net Amounts Presented 19.0 76.5
Cash Collateral 1.6 2.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 17.4 74.5
Foreign currency contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 9.9 16.0
Gross Amounts Offset 9.1 5.1
Net Amounts Presented 0.8 10.9
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 0.8 10.9
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 14.0 6.4
Gross Amounts Offset 9.1 5.1
Net Amounts Presented 4.8 1.2
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts $ 4.8 $ 1.2