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Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Segment Reporting Information [Line Items] |  |
Net sales | $ 353.5 | $ 416.1
Cost of sales | 311.5 | 326.8
Gross margin | 42.0 | 89.3
Operating income (loss) | (10.3) | 34.6
Securities earnings | 6.8 | 6.7
Insurance recoveries | 0.1 | 3.1
General expenses, net | (11.5) | (8.2)
Interest expense | (15.7) | (14.6)
Income (loss) before income taxes | (30.6) | 21.6
Chemicals |  |
Segment Reporting Information [Line Items] |  |
Net sales | 318.5 | 365.1
Cost of sales | 278.5 | 288.2
Gross margin | 40.0 | 76.9
Operating income (loss) | 3.0 | 34.0
Component Products |  |
Segment Reporting Information [Line Items] |  |
Net sales | 27.1 | 27.9
Cost of sales | 18.9 | 19.3
Gross margin | 8.2 | 8.6
Operating income (loss) | 3.4 | 3.7
Waste Management |  |
Segment Reporting Information [Line Items] |  |
Net sales | 5.2 | 15.0
Cost of sales | 11.7 | 12.1
Gross margin | (6.5) | 2.9
Operating income (loss) | (10.8) | (2.9)
Real Estate Management And Development |  |
Segment Reporting Information [Line Items] |  |
Net sales | 2.7 | 8.1
Cost of sales | 2.4 | 7.2
Gross margin | 0.3 | 0.9
Operating income (loss) | $ (5.9) | $ (0.2)

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