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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

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