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Business and Geographic Segments - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 324.8 | $ 383.2 | $ 408.8 | $ 416.1 | $ 432.0 | $ 476.5 | $ 491.7 | $ 462.4 | $ 1,532.9 | $ 1,862.6 | $ 1,863.6
Cost of sales |  |  |  |  |  |  |  |  | 1,310.0 | 1,459.8 | 1,729.4
Gross margin | 27.5 | 49.8 | 56.3 | 89.3 | 97.0 | 115.8 | 104.2 | 85.8 | 222.9 | 402.8 | 134.2
Operating income (loss) | $ (24.9) | $ (5.0) | $ (10.1) | $ 34.6 | $ 40.5 | $ 60.2 | $ 46.7 | $ 22.8 | (5.4) | 170.2 | (138.7)
Equity in earnings of investee |  |  |  |  |  |  |  |  |  |  | 0.5
Securities earnings |  |  |  |  |  |  |  |  | 26.5 | 26.9 | 26.6
Insurance recoveries |  |  |  |  |  |  |  |  | 3.7 | 10.4 | 9.4
Gain on bargain purchase and remeasurement of our existing investment in acquiree |  |  |  |  |  |  |  |  |  |  | 54.6
General expenses, net |  |  |  |  |  |  |  |  | (39.6) | (38.8) | (105.3)
Loss on prepayment of debt, net |  |  |  |  |  |  |  |  |  |  | (8.9)
Interest expense |  |  |  |  |  |  |  |  | (59.0) | (56.7) | (56.1)
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (73.8) | 112.0 | (217.9)
Depreciation and amortization |  |  |  |  |  |  |  |  | 69.9 | 78.4 | 74.5
Capital expenditures |  |  |  |  |  |  |  |  | 54.6 | 72.7 | 74.6
Operating Segment | Chemicals |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,348.8 | 1,651.9 | 1,732.4
Cost of sales |  |  |  |  |  |  |  |  | 1,158.5 | 1,304.6 | 1,622.6
Gross margin |  |  |  |  |  |  |  |  | 190.3 | 347.3 | 109.8
Operating income (loss) |  |  |  |  |  |  |  |  | 7.1 | 156.8 | (125.4)
Depreciation and amortization |  |  |  |  |  |  |  |  | 44.3 | 51.9 | 52.8
Capital expenditures |  |  |  |  |  |  |  |  | 47.5 | 61.3 | 67.6
Operating Segment | Component Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 109.0 | 103.9 | 92.0
Cost of sales |  |  |  |  |  |  |  |  | 75.6 | 71.6 | 64.5
Gross margin |  |  |  |  |  |  |  |  | 33.4 | 32.3 | 27.5
Operating income (loss) |  |  |  |  |  |  |  |  | 14.0 | 13.6 | 9.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.5 | 3.5 | 3.3
Capital expenditures |  |  |  |  |  |  |  |  | 4.2 | 2.8 | 3.5
Operating Segment | Waste Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 45.0 | 66.5 | 39.2
Cost of sales |  |  |  |  |  |  |  |  | 50.5 | 49.7 | 42.3
Gross margin |  |  |  |  |  |  |  |  | (5.5) | 16.8 | (3.1)
Operating income (loss) |  |  |  |  |  |  |  |  | (26.5) | (2.2) | (22.6)
Depreciation and amortization |  |  |  |  |  |  |  |  | 19.3 | 20.3 | 18.4
Capital expenditures |  |  |  |  |  |  |  |  | 1.7 | 4.5 | $ 3.5
Operating Segment | Real Estate Management And Development |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 30.1 | 40.3 |
Cost of sales |  |  |  |  |  |  |  |  | 25.4 | 33.9 |
Gross margin |  |  |  |  |  |  |  |  | 4.7 | 6.4 |
Operating income (loss) |  |  |  |  |  |  |  |  |  | 2.0 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2.8 | 2.7 |
Capital expenditures |  |  |  |  |  |  |  |  | $ 1.2 | 4.0 |
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 0.1 |

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