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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Gross Amounts Recognized $ 472.8 $ 845.8
Gross Amounts Offset 386.6 647.0
Net Amounts Presented 86.3 198.8
Cash Collateral 1.6 3.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 84.7 195.8
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 436.8 769.1
Gross Amounts Offset 386.6 647.0
Net Amounts Presented 50.2 122.2
Cash Collateral 6.9 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 43.3 122.2
Commodity contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 461.4 841.2
Gross Amounts Offset 384.7 646.0
Net Amounts Presented 76.8 195.1
Cash Collateral 1.6 3.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 75.2 192.1
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 433.9 767.9
Gross Amounts Offset 384.7 646.0
Net Amounts Presented 49.2 121.9
Cash Collateral 6.9 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 42.3 121.9
Foreign currency contracts    
Offsetting Assets [Line Items]    
Gross Amounts Recognized 11.4 4.6
Gross Amounts Offset 1.9 0.9
Net Amounts Presented 9.5 3.7
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts 9.5 3.7
Offsetting Liabilities [Line Items]    
Gross Amounts Recognized 2.9 1.2
Gross Amounts Offset 1.9 0.9
Net Amounts Presented 1.0 0.3
Cash Collateral 0.0 0.0
Gross Amounts without Right of Offset 0.0 0.0
Net Amounts $ 1.0 $ 0.3