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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]          
Net sales $ 1,283.2 $ 1,624.2 $ 2,188.7 $ 3,013.1  
Cost of product sold (exclusive of depreciation and amortization) 976.9 1,192.2 1,713.7 2,265.8  
Direct operating expenses (exclusive of depreciation and amortization) 138.3 115.4 279.7 226.9  
Depreciation and amortization 50.7 42.5 90.7 84.5  
Operating income 90.7 274.2 50.8 410.8  
Capital expenditures 35.3 41.2 82.8 86.7  
Total assets 4,056.4   4,056.4   $ 3,299.4
Goodwill 41.0   41.0   41.0
Operating Segments | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 1,164.4 1,547.5 1,998.4 2,852.0  
Cost of product sold (exclusive of depreciation and amortization) 941.9 1,180.9 1,664.2 2,237.1  
Direct operating expenses (exclusive of depreciation and amortization) 84.0 90.3 201.7 177.3  
Depreciation and amortization 31.6 34.2 63.1 68.2  
Operating income 90.1 250.8 34.1 360.0  
Capital expenditures 24.0 36.4 68.0 78.1  
Total assets 2,192.7   2,192.7   2,189.0
Goodwill 0.0   0.0   0.0
Operating Segments | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 119.8 80.8 192.9 173.9  
Cost of product sold (exclusive of depreciation and amortization) 36.0 15.4 52.4 41.2  
Direct operating expenses (exclusive of depreciation and amortization) 54.2 25.1 77.9 49.6  
Depreciation and amortization 17.6 7.0 24.5 13.8  
Operating income 3.7 28.7 23.4 60.2  
Capital expenditures 10.1 3.4 11.9 6.0  
Total assets 1,352.6   1,352.6   536.3
Goodwill 41.0   41.0   41.0
Intersegment elimination          
Segment Reporting Information [Line Items]          
Net sales (1.0) (4.1) (2.6) (12.8)  
Cost of product sold (exclusive of depreciation and amortization) (1.0) (4.1) (2.9) (12.5)  
Intersegment elimination | Petroleum          
Segment Reporting Information [Line Items]          
Net sales 0.5 2.1 0.9 4.2  
Cost of product sold (exclusive of depreciation and amortization) 0.5 2.0 1.6 8.5  
Intersegment elimination | Nitrogen Fertilizer          
Segment Reporting Information [Line Items]          
Net sales 0.5 2.0 1.6 8.5  
Cost of product sold (exclusive of depreciation and amortization) 0.5 2.1 1.3 3.9  
Other          
Segment Reporting Information [Line Items]          
Direct operating expenses (exclusive of depreciation and amortization) 0.1 0.0 0.1 0.0  
Depreciation and amortization 1.5 1.3 3.1 2.5  
Operating income (3.1) (5.3) (6.7) (9.4)  
Capital expenditures 1.2 $ 1.4 2.9 $ 2.6  
Total assets 511.1   511.1   574.1
Goodwill $ 0.0   $ 0.0   $ 0.0