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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Net sales $ 1,507.1 $ 905.5  
Cost of materials and other 1,221.2 736.8  
Direct operating expenses (exclusive of depreciation and amortization) 138.1 141.4  
Depreciation and amortization 51.1 40.0  
Operating income (loss) 67.6 (39.9)  
Capital expenditures 24.2 47.5  
Total assets 4,053.2   $ 4,050.2
Goodwill 41.0   41.0
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 1,423.5 834.0  
Cost of materials and other 1,201.3 722.3  
Direct operating expenses (exclusive of depreciation and amortization) 102.1 117.7  
Depreciation and amortization 34.1 31.5  
Operating income (loss) 66.0 (56.0)  
Capital expenditures 19.6 44.0  
Total assets 2,371.8   2,331.9
Goodwill 0.0   0.0
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 85.3 73.1  
Cost of materials and other 21.8 16.3  
Direct operating expenses (exclusive of depreciation and amortization) 35.9 23.7  
Depreciation and amortization 15.4 7.0  
Operating income (loss) 5.3 19.7  
Capital expenditures 4.1 1.7  
Total assets 1,328.4   1,312.2
Goodwill 41.0   41.0
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)  
Other      
Segment Reporting Information [Line Items]      
Direct operating expenses (exclusive of depreciation and amortization) 0.1 0.0  
Depreciation and amortization 1.6 1.5  
Operating income (loss) (3.7) (3.6)  
Capital expenditures 0.5 $ 1.8  
Total assets 353.0   406.1
Goodwill $ 0.0   $ 0.0