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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Net sales $ 905.5 $ 1,388.9  
Cost of product sold (exclusive of depreciation and amortization) 736.8 1,073.6  
Direct operating expenses (exclusive of depreciation and amortization) 141.4 111.4  
Depreciation and amortization 40.0 42.0  
Operating income (loss) (39.9) 136.6  
Capital expenditures 47.5 45.5  
Total assets 3,183.5   $ 3,299.4
Goodwill 41.0   41.0
Operating Segments | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 834.0 1,304.4  
Cost of product sold (exclusive of depreciation and amortization) 722.3 1,056.1  
Direct operating expenses (exclusive of depreciation and amortization) 117.7 87.0  
Depreciation and amortization 31.5 34.0  
Operating income (loss) (56.0) 109.2  
Capital expenditures 44.0 41.7  
Total assets 2,116.9   2,189.0
Goodwill 0.0   0.0
Operating Segments | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 73.1 93.1  
Cost of product sold (exclusive of depreciation and amortization) 16.3 25.8  
Direct operating expenses (exclusive of depreciation and amortization) 23.7 24.4  
Depreciation and amortization 7.0 6.8  
Operating income (loss) 19.7 31.5  
Capital expenditures 1.7 2.7  
Total assets 529.2   536.3
Goodwill 41.0   41.0
Intersegment elimination      
Segment Reporting Information [Line Items]      
Net sales (1.6) (8.6)  
Cost of product sold (exclusive of depreciation and amortization) (1.8) (8.3)  
Intersegment elimination | Petroleum      
Segment Reporting Information [Line Items]      
Net sales 0.4 2.1  
Cost of product sold (exclusive of depreciation and amortization) 1.1 6.5  
Intersegment elimination | Nitrogen Fertilizer      
Segment Reporting Information [Line Items]      
Net sales 1.1 6.5  
Cost of product sold (exclusive of depreciation and amortization) 0.7 1.8  
Other      
Segment Reporting Information [Line Items]      
Direct operating expenses (exclusive of depreciation and amortization) 0.0 0.0  
Depreciation and amortization 1.5 1.2  
Operating income (loss) (3.6) (4.1)  
Capital expenditures 1.8 $ 1.1  
Total assets 537.4   574.1
Goodwill $ 0.0   $ 0.0