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Business Segments - Additional Information (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 2  
Net sales $ 1,507.1 $ 905.5
Cost of materials and other 1,221.2 736.8
Intersegment elimination    
Segment Reporting Information [Line Items]    
Net sales (1.7) (1.6)
Cost of materials and other (1.9) (1.8)
Intersegment elimination | Petroleum    
Segment Reporting Information [Line Items]    
Net sales (0.4) (0.4)
Cost of materials and other (0.1) (1.1)
Intersegment elimination | Nitrogen Fertilizer    
Segment Reporting Information [Line Items]    
Net sales (1.2) (1.1)
Cost of materials and other $ (0.5) $ (0.7)