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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net sales $ 1,240.3 $ 1,408.8 $ 3,429.0 $ 4,421.9  
Cost of product sold (exclusive of depreciation and amortization) 1,005.7 1,076.7 2,719.3 3,342.5  
Direct operating expenses (exclusive of depreciation and amortization) 129.5 145.8 409.2 372.7  
Depreciation and amortization 50.1 38.7 140.8 123.2  
Operating income 27.2 121.5 78.0 532.3  
Capital expenditures 22.8 55.2 105.6 141.9  
Total assets 4,055.0   4,055.0   $ 3,299.4
Goodwill 41.0   41.0   41.0
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,163.5 1,361.6 3,161.9 4,213.6  
Cost of product sold (exclusive of depreciation and amortization) 987.5 1,063.7 2,651.7 3,300.8  
Direct operating expenses (exclusive of depreciation and amortization) 97.0 112.6 298.7 289.9  
Depreciation and amortization 32.5 29.9 95.6 98.1  
Operating income 28.4 137.2 62.5 497.2  
Capital expenditures 15.4 45.5 83.4 123.6  
Total assets 2,277.3   2,277.3   2,189.0
Goodwill 0.0   0.0   0.0
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 78.5 49.3 271.4 223.2  
Cost of product sold (exclusive of depreciation and amortization) 19.9 14.5 72.2 55.7  
Direct operating expenses (exclusive of depreciation and amortization) 32.5 33.2 110.4 82.7  
Depreciation and amortization 16.4 7.4 41.0 21.2  
Operating income 2.4 (11.8) 25.8 48.4  
Capital expenditures 6.4 6.4 18.3 12.4  
Total assets 1,326.9   1,326.9   536.3
Goodwill 41.0   41.0   41.0
Intersegment elimination          
Segment Reporting Information [Line Items]          
Net sales (1.7) (2.1) (4.3) (14.9)  
Cost of product sold (exclusive of depreciation and amortization) (1.7) (1.5) (4.6) (14.0)  
Intersegment elimination | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 0.4 1.7 1.3 5.9  
Cost of product sold (exclusive of depreciation and amortization) 1.2 0.5 2.9 9.0  
Intersegment elimination | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 1.2 0.5 2.9 9.0  
Cost of product sold (exclusive of depreciation and amortization) 0.5 1.1 1.7 5.0  
Other          
Segment Reporting Information [Line Items]          
Direct operating expenses (exclusive of depreciation and amortization) 0.0 0.0 0.1 0.1  
Depreciation and amortization 1.2 1.4 4.2 3.9  
Operating income (3.6) (3.9) (10.3) (13.3)  
Capital expenditures 1.0 $ 3.3 3.9 $ 5.9  
Total assets 450.8   450.8   574.1
Goodwill $ 0.0   $ 0.0   $ 0.0