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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Net sales $ 1,536.5 $ 1,507.1  
Cost of materials and other 1,238.3 1,221.2  
Direct operating expenses (exclusive of depreciation and amortization) 131.9 138.1  
Depreciation and amortization 51.9 51.1  
Operating income (loss) 90.5 67.6  
Capital expenditures 20.0 24.2  
Total assets 3,823.3   $ 3,806.7
Goodwill 41.0   41.0
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 1,458.2 1,423.5  
Cost of materials and other 1,217.7 1,201.3  
Direct operating expenses (exclusive of depreciation and amortization) 93.0 102.1  
Depreciation and amortization 33.7 34.1  
Operating income (loss) 97.2 66.0  
Capital expenditures 16.0 19.6  
Total assets 2,295.3   2,269.9
Goodwill 0.0   0.0
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 79.9 85.3  
Cost of materials and other 22.3 21.8  
Direct operating expenses (exclusive of depreciation and amortization) 38.9 35.9  
Depreciation and amortization 16.4 15.4  
Operating income (loss) (3.4) 5.3  
Capital expenditures 2.7 4.1  
Total assets 1,239.5   1,234.3
Goodwill 41.0   41.0
Intersegment elimination      
Segment Reporting Information [Line Items]      
Net sales (1.6) (1.7)  
Cost of materials and other (1.7) (1.9)  
Other      
Segment Reporting Information [Line Items]      
Direct operating expenses (exclusive of depreciation and amortization) 0.0 0.1  
Depreciation and amortization 1.8 1.6  
Operating income (loss) (3.3) (3.7)  
Capital expenditures 1.3 $ 0.5  
Total assets 288.5   302.5
Goodwill $ 0.0   $ 0.0