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Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 398.6 | $ 408.8 | $ 752.1 | $ 824.9
Cost of sales | 336.4 | 352.5 | 647.9 | 679.3
Gross margin | 62.2 | 56.3 | 104.2 | 145.6
Operating income (loss) | 9.8 | (10.1) | (0.5) | 24.5
Securities earnings | 6.9 | 6.7 | 13.7 | 13.4
Insurance recoveries | 0.2 | 0.3 | 0.3 | 3.4
General expenses, net | (8.6) | (11.2) | (20.1) | (19.4)
Interest expense | (15.8) | (14.5) | (31.5) | (29.1)
Loss before income taxes | (7.5) | (28.8) | (38.1) | (7.2)
Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 356.0 | 360.2 | 674.5 | 725.3
Cost of sales | 301.0 | 314.2 | 579.5 | 602.4
Gross margin | 55.0 | 46.0 | 95.0 | 122.9
Operating income (loss) | 12.7 | (7.9) | 15.7 | 26.1
Component Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 27.1 | 28.9 | 54.2 | 56.8
Cost of sales | 18.6 | 19.8 | 37.5 | 39.1
Gross margin | 8.5 | 9.1 | 16.7 | 17.7
Operating income (loss) | 3.7 | 4.3 | 7.1 | 8.0
Waste Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 11.1 | 10.0 | 16.3 | 25.0
Cost of sales | 13.6 | 12.4 | 25.3 | 24.5
Gross margin | (2.5) | (2.4) | (9.0) | 0.5
Operating income (loss) | (7.1) | (8.1) | (17.9) | (11.0)
Real Estate Management And Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 4.4 | 9.7 | 7.1 | 17.8
Cost of sales | 3.2 | 6.1 | 5.6 | 13.3
Gross margin | 1.2 | 3.6 | 1.5 | 4.5
Operating income (loss) | $ 0.5 | $ 1.6 | $ (5.4) | $ 1.4

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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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