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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets:    
Gross Amounts Recognized $ 378.5 $ 261.1
Gross Amounts Offset 294.6 131.1
Net Amounts Presented 83.9 130.0
Cash Collateral 1.2 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 82.7 130.0
Liabilities:    
Gross Derivative Liabilities 349.5 266.6
Gross Amounts Offset 294.6 131.1
Net Amounts Presented 54.9 135.5
Cash Collateral 2.3 29.3
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 52.6 106.3
Commodity contracts    
Assets:    
Gross Amounts Recognized 371.0 259.0
Gross Amounts Offset 287.1 130.0
Net Amounts Presented 83.9 129.0
Cash Collateral 1.2 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 82.7 129.0
Liabilities:    
Gross Derivative Liabilities 326.0 255.0
Gross Amounts Offset 287.1 130.0
Net Amounts Presented 38.9 125.0
Cash Collateral 2.3 29.3
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 36.6 95.7
Interest rate contract    
Liabilities:    
Gross Derivative Liabilities 3.7  
Gross Amounts Offset 0.0  
Net Amounts Presented 3.7  
Cash Collateral 0.0  
Gross Amounts Without Right of Offset 0.0  
Net Amounts 3.7  
Foreign currency contracts    
Assets:    
Gross Amounts Recognized 7.5 2.0
Gross Amounts Offset 7.5 1.0
Net Amounts Presented 0.0 1.0
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts 0.0 1.0
Liabilities:    
Gross Derivative Liabilities 19.8 11.6
Gross Amounts Offset 7.5 1.0
Net Amounts Presented 12.3 10.5
Cash Collateral 0.0 0.0
Gross Amounts Without Right of Offset 0.0 0.0
Net Amounts $ 12.3 $ 10.5