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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Gross Amounts Recognized $ 845.8 $ 312.0
Gross Amounts Offset 647.0 235.2
Net Amounts Presented 198.8 76.9
Cash Collateral 3.0 21.2
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 195.8 55.7
Liabilities:    
Gross Amounts Recognized 769.1 332.5
Gross Amounts Offset 647.0 235.2
Net Amounts Presented 122.2 97.4
Cash Collateral 0.0 39.2
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 122.2 58.2
Commodity contracts    
Assets:    
Gross Amounts Recognized 841.2 303.6
Gross Amounts Offset 646.0 228.4
Net Amounts Presented 195.1 75.1
Cash Collateral 3.0 21.2
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 192.1 53.9
Liabilities:    
Gross Amounts Recognized 767.9 323.9
Gross Amounts Offset 646.0 228.4
Net Amounts Presented 121.9 95.4
Cash Collateral 0.0 39.2
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 121.9 56.2
Foreign currency contracts    
Assets:    
Gross Amounts Recognized 4.6 8.5
Gross Amounts Offset 0.9 6.7
Net Amounts Presented 3.7 1.7
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 3.7 1.7
Liabilities:    
Gross Amounts Recognized 1.2 8.7
Gross Amounts Offset 0.9 6.7
Net Amounts Presented 0.3 2.0
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts $ 0.3 $ 2.0