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Revenue - Revenue Disaggregated by Major Product (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]  
Total revenue $ 1,536.5
Gasoline  
Disaggregation of Revenue [Line Items]  
Total revenue 711.7
Distillates  
Disaggregation of Revenue [Line Items]  
Total revenue 652.2
Ammonia  
Disaggregation of Revenue [Line Items]  
Total revenue 11.6
UAN  
Disaggregation of Revenue [Line Items]  
Total revenue 52.8
Urea products  
Disaggregation of Revenue [Line Items]  
Total revenue 4.9
Freight revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 14.2
Other product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 87.6
Revenue from product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 1,535.0
Other revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 1.5
Petroleum | Revenue from product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 1,456.7
Operating Segments | Petroleum  
Disaggregation of Revenue [Line Items]  
Total revenue 1,458.2
Operating Segments | Petroleum | Gasoline  
Disaggregation of Revenue [Line Items]  
Total revenue 711.7
Operating Segments | Petroleum | Distillates  
Disaggregation of Revenue [Line Items]  
Total revenue 652.2
Operating Segments | Petroleum | Ammonia  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Operating Segments | Petroleum | UAN  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Operating Segments | Petroleum | Urea products  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Operating Segments | Petroleum | Freight revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 5.5
Operating Segments | Petroleum | Other product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 87.3
Operating Segments | Petroleum | Other revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 1.5
Operating Segments | Nitrogen Fertilizer  
Disaggregation of Revenue [Line Items]  
Total revenue 79.9
Operating Segments | Nitrogen Fertilizer | Gasoline  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Operating Segments | Nitrogen Fertilizer | Distillates  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Operating Segments | Nitrogen Fertilizer | Ammonia  
Disaggregation of Revenue [Line Items]  
Total revenue 11.6
Operating Segments | Nitrogen Fertilizer | UAN  
Disaggregation of Revenue [Line Items]  
Total revenue 52.8
Operating Segments | Nitrogen Fertilizer | Urea products  
Disaggregation of Revenue [Line Items]  
Total revenue 4.9
Operating Segments | Nitrogen Fertilizer | Freight revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 8.7
Operating Segments | Nitrogen Fertilizer | Other product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 1.9
Operating Segments | Nitrogen Fertilizer | Revenue from product sales  
Disaggregation of Revenue [Line Items]  
Total revenue 79.9
Operating Segments | Nitrogen Fertilizer | Other revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations  
Disaggregation of Revenue [Line Items]  
Total revenue (1.6)
Other / Eliminations | Gasoline  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | Distillates  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | Ammonia  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | UAN  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | Urea products  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | Freight revenue  
Disaggregation of Revenue [Line Items]  
Total revenue 0.0
Other / Eliminations | Other product sales  
Disaggregation of Revenue [Line Items]  
Total revenue (1.6)
Other / Eliminations | Revenue from product sales  
Disaggregation of Revenue [Line Items]  
Total revenue (1.6)
Other / Eliminations | Other revenue  
Disaggregation of Revenue [Line Items]  
Total revenue $ 0.0