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Commitments and Contingencies - Environmental, Health and Safety Matters (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Loss Contingencies [Line Items]      
Environmental expenditures capitalized $ 4.7 $ 3.6  
EHS      
Loss Contingencies [Line Items]      
Environmental accruals 4.5   $ 4.8
EHS | CRRM      
Loss Contingencies [Line Items]      
Cost of renewable identification numbers expense (6.4) $ 43.1  
Biofuel blending obligation recorded in other current liabilities $ 180.3   $ 186.3