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Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 406.8 | $ 383.2 | $ 1,158.9 | $ 1,208.1
Cost of sales | 321.5 | 333.4 | 969.4 | 1,012.7
Gross margin | 85.3 | 49.8 | 189.5 | 195.4
Operating income (loss) | 29.7 | (5.0) | 29.2 | 19.5
Securities earnings | 6.8 | 6.5 | 20.5 | 19.9
Insurance recoveries | 0.1 | 0.1 | 0.4 | 3.5
General expenses, net | (9.1) | (10.0) | (29.2) | (29.4)
Interest expense | (15.9) | (14.4) | (47.4) | (43.5)
Income (loss) before income taxes | 11.6 | (22.8) | (26.5) | (30.0)
Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 356.1 | 336.5 | 1,030.6 | 1,061.8
Cost of sales | 281.1 | 293.7 | 860.6 | 896.1
Gross margin | 75.0 | 42.8 | 170.0 | 165.7
Operating income (loss) | 30.1 | (1.3) | 45.8 | 24.8
Component Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 28.4 | 26.5 | 82.6 | 83.3
Cost of sales | 19.0 | 18.4 | 56.5 | 57.5
Gross margin | 9.4 | 8.1 | 26.1 | 25.8
Operating income (loss) | 4.4 | 3.4 | 11.5 | 11.4
Waste Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 13.6 | 9.9 | 29.9 | 34.9
Cost of sales | 14.1 | 13.3 | 39.4 | 37.8
Gross margin | (0.5) | (3.4) | (9.5) | (2.9)
Operating income (loss) | (5.1) | (8.3) | (23.0) | (19.3)
Real Estate Management And Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 8.7 | 10.3 | 15.8 | 28.1
Cost of sales | 7.3 | 8.0 | 12.9 | 21.3
Gross margin | 1.4 | 2.3 | 2.9 | 6.8
Operating income (loss) | $ 0.3 | $ 1.2 | $ (5.1) | $ 2.6

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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