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Business Segments - Summary of Operating Results and Capital Expenditures by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Net sales $ 1,593.1 $ 1,453.8 $ 1,434.4 $ 1,507.1 $ 1,353.4 $ 1,240.3 $ 1,283.2 $ 905.5 $ 5,988.4 $ 4,782.4 $ 5,432.5
Cost of materials and other 1,300.7 1,132.4 1,228.6 1,221.2 1,128.1 1,005.7 976.9 736.8 4,882.9 3,847.5 4,190.4
Direct operating expenses (exclusive of depreciation and amortization as reflected below) 176.1 161.1 124.2 138.1 132.6 129.5 138.3 141.4 599.5 541.8 584.7
Depreciation and amortization                 214.0 193.1 164.1
Operating income (loss) 30.0 $ 78.9 $ 1.3 $ 67.6 12.9 $ 27.2 $ 90.7 $ (39.9) 177.8 90.9 421.6
Capital expenditures                 118.6 132.7 218.7
Total assets 3,806.7       4,050.2       3,806.7 4,050.2 3,299.4
Goodwill 41.0       41.0       41.0 41.0 41.0
Operating Segments | Petroleum                      
Segment Reporting Information [Line Items]                      
Net sales                 5,664.2 4,431.3 5,161.9
Cost of materials and other                 4,804.7 3,759.2 4,143.6
Direct operating expenses (exclusive of depreciation and amortization as reflected below)                 443.8 393.4 478.5
Depreciation and amortization                 133.1 129.0 130.2
Operating income (loss)                 203.8 77.8 361.7
Capital expenditures                 99.7 102.3 194.7
Total assets 2,269.9       2,331.9       2,269.9 2,331.9 2,189.0
Goodwill 0.0       0.0       0.0 0.0 0.0
Operating Segments | Nitrogen Fertilizer                      
Segment Reporting Information [Line Items]                      
Net sales                 330.8 356.3 289.2
Cost of materials and other                 84.9 93.7 65.2
Direct operating expenses (exclusive of depreciation and amortization as reflected below)                 155.5 148.3 106.1
Depreciation and amortization                 74.0 58.2 28.4
Operating income (loss)                 (9.2) 26.8 68.7
Capital expenditures                 14.5 23.2 17.0
Total assets 1,234.3       1,312.2       1,234.3 1,312.2 536.3
Goodwill 41.0       41.0       41.0 41.0 41.0
Intersegment elimination                      
Segment Reporting Information [Line Items]                      
Net sales                 (6.6) (5.2) (18.6)
Cost of materials and other                 (6.7) (5.4) (18.4)
Other                      
Segment Reporting Information [Line Items]                      
Direct operating expenses (exclusive of depreciation and amortization as reflected below)                 0.2 0.1 0.1
Depreciation and amortization                 6.9 5.9 5.5
Operating income (loss)                 (16.8) (13.7) (8.8)
Capital expenditures                 4.4 7.2 7.0
Total assets 302.5       406.1       302.5 406.1 574.1
Goodwill $ 0.0       $ 0.0       $ 0.0 $ 0.0 $ 0.0