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Commitments and Contingencies - Environmental, Health and Safety ("EHS") Matters (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Loss Contingencies [Line Items]          
Environmental expenditures capitalized $ 4.5 $ 6.5 $ 11.5 $ 12.5  
Recurring | Biofuels blending obligation          
Loss Contingencies [Line Items]          
Biofuel blending obligation, fair value 127.0   127.0    
Recurring | Biofuels blending obligation | Level 2          
Loss Contingencies [Line Items]          
Biofuel blending obligation, fair value 127.0   127.0   $ 186.3
EHS          
Loss Contingencies [Line Items]          
Environmental accruals 3.8   3.8   4.8
EHS | CRRM          
Loss Contingencies [Line Items]          
Cost of renewable identification numbers expense 64.3 $ 58.3 163.5 $ 152.4  
Biofuel blending obligation recorded in other current liabilities $ 185.3   $ 185.3   $ 186.3