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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Gross Amounts Recognized $ 312.0 $ 347.2
Gross Amounts Offset 235.2 254.8
Net Amounts Presented 76.9 92.4
Cash Collateral 21.2 27.1
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 55.7 65.3
Liabilities:    
Gross Amounts Recognized 332.5 332.5
Gross Amounts Offset 235.2 254.8
Net Amounts Presented 97.4 77.7
Cash Collateral 39.2 2.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 58.2 75.7
Commodity contracts    
Assets:    
Gross Amounts Recognized 303.6 331.2
Gross Amounts Offset 228.4 249.7
Net Amounts Presented 75.1 81.5
Cash Collateral 21.2 27.1
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 53.9 54.5
Liabilities:    
Gross Amounts Recognized 323.9 326.1
Gross Amounts Offset 228.4 249.7
Net Amounts Presented 95.4 76.5
Cash Collateral 39.2 2.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 56.2 74.5
Foreign currency contracts    
Assets:    
Gross Amounts Recognized 8.5 16.0
Gross Amounts Offset 6.7 5.1
Net Amounts Presented 1.7 10.9
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 1.7 10.9
Liabilities:    
Gross Amounts Recognized 8.7 6.4
Gross Amounts Offset 6.7 5.1
Net Amounts Presented 2.0 1.2
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts $ 2.0 $ 1.2