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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Net sales $ 1,434.4 $ 1,283.2 $ 2,941.5 $ 2,188.7  
Cost of materials and other 1,228.6 976.9 2,449.8 1,713.7  
Direct operating expenses (exclusive of depreciation and amortization) 124.2 138.3 262.3 279.7  
Depreciation and amortization 54.0 50.7 105.1 90.7  
Operating income (loss) 1.3 90.7 68.9 50.8  
Capital expenditures 33.2 35.3 57.4 82.8  
Total assets 4,029.1   4,029.1   $ 4,050.2
Goodwill 41.0   41.0   41.0
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,338.2 1,164.4 2,761.7 1,998.4  
Cost of materials and other 1,208.0 941.9 2,409.3 1,664.2  
Direct operating expenses (exclusive of depreciation and amortization) 86.3 84.0 188.4 201.7  
Depreciation and amortization 32.4 31.6 66.5 63.1  
Operating income (loss) (7.4) 90.1 58.6 34.1  
Capital expenditures 27.8 24.0 47.4 68.0  
Total assets 2,447.1   2,447.1   2,331.9
Goodwill 0.0   0.0   0.0
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 97.9 119.8 183.2 192.9  
Cost of materials and other 22.1 36.0 43.9 52.4  
Direct operating expenses (exclusive of depreciation and amortization) 37.8 54.2 73.7 77.9  
Depreciation and amortization 20.0 17.6 35.4 24.5  
Operating income (loss) 12.2 3.7 17.5 23.4  
Capital expenditures 4.5 10.1 8.6 11.9  
Total assets 1,280.6   1,280.6   1,312.2
Goodwill 41.0   41.0   41.0
Intersegment elimination          
Segment Reporting Information [Line Items]          
Net sales (1.7) (1.0) (3.4) (2.6)  
Cost of materials and other (1.5) (1.0) (3.4) (2.9)  
Intersegment elimination | Petroleum          
Segment Reporting Information [Line Items]          
Net sales (0.8) (0.5) (1.2) (0.9)  
Cost of materials and other 0.0 (0.5) (0.1) (1.6)  
Intersegment elimination | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales (0.9) (0.5) (2.1) (1.6)  
Cost of materials and other (0.5) (0.5) (1.0) (1.3)  
Other          
Segment Reporting Information [Line Items]          
Direct operating expenses (exclusive of depreciation and amortization) 0.1 0.1 0.2 0.1  
Depreciation and amortization 1.6 1.5 3.2 3.1  
Operating income (loss) (3.5) (3.1) (7.2) (6.7)  
Capital expenditures 0.9 $ 1.2 1.4 $ 2.9  
Total assets 301.4   301.4   406.1
Goodwill $ 0.0   $ 0.0   $ 0.0