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Business and Geographic Segments - Segment Operating Performance (Detail) - 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 | $ 495.9 | $ 496.5 | $ 481.7 | $ 405.3 | $ 390.5 | $ 393.1 | $ 387.5 | $ 348.3 | $ 1,879.4 | $ 1,519.4 | $ 1,487.9
Cost of sales |  |  |  |  |  |  |  |  | 1,277.4 | 1,219.2 | 1,259.5
Gross margin | 185.3 | 161.5 | 141.2 | 114.0 | 101.4 | 85.7 | 64.7 | 48.4 | 602.0 | 300.2 | 228.4
Operating income | $ 125.4 | 98.6 | $ 78.8 | $ 60.1 | $ 55.2 | $ 34.8 | $ 16.9 | $ 0.5 | 362.9 | 107.4 | 21.1
Securities earnings |  |  |  |  |  |  |  |  | 29.5 | 27.2 | 26.4
Insurance recoveries |  |  |  |  |  |  |  |  | 0.4 | 0.4 | 3.7
General expenses, net |  |  |  |  |  |  |  |  | (35.0) | (37.3) | (39.5)
Loss on prepayment of debt |  | $ (7.1) |  |  |  |  |  |  | (7.1) |  |
Interest expense |  |  |  |  |  |  |  |  | (58.9) | (58.1) | (53.6)
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 291.8 | 39.6 | (41.9)
Depreciation and amortization |  |  |  |  |  |  |  |  | 59.0 | 67.5 | 69.9
Capital expenditures |  |  |  |  |  |  |  |  | 71.3 | 58.9 | 54.6
Chemicals |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,729.0 | 1,364.3 | 1,348.8
Cost of sales |  |  |  |  |  |  |  |  | 1,172.1 | 1,109.2 | 1,158.5
Gross margin |  |  |  |  |  |  |  |  | 556.9 | 255.1 | 190.3
Operating income |  |  |  |  |  |  |  |  | 341.1 | 91.0 | 7.1
Chemicals | Operating Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 43.4 | 42.6 | 44.3
Capital expenditures |  |  |  |  |  |  |  |  | 64.3 | 53.0 | 47.5
Component Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 112.0 | 108.9 | 109.0
Cost of sales |  |  |  |  |  |  |  |  | 77.2 | 73.8 | 75.6
Gross margin |  |  |  |  |  |  |  |  | 34.8 | 35.1 | 33.4
Operating income |  |  |  |  |  |  |  |  | 15.2 | 15.6 | 14.0
Component Products | Operating Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.7 | 3.7 | 3.5
Capital expenditures |  |  |  |  |  |  |  |  | 2.8 | 3.2 | 4.2
Real Estate Management And Development |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 38.4 | 46.2 | 30.1
Cost of sales |  |  |  |  |  |  |  |  | 28.1 | 36.2 | 25.4
Gross margin |  |  |  |  |  |  |  |  | 10.3 | 10.0 | 4.7
Operating income |  |  |  |  |  |  |  |  | 6.6 | 0.8 |
Real Estate Management And Development | Operating Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 3.0 | 2.9 | 2.8
Capital expenditures |  |  |  |  |  |  |  |  | 3.3 | 2.0 | 1.2
Waste Management | Operating Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 8.9 | 18.3 | 19.3
Capital expenditures |  |  |  |  |  |  |  |  | $ 0.9 | $ 0.7 | $ 1.7

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