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Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 408.8 | $ 491.7 | $ 824.9 | $ 954.1
Cost of sales | 352.5 | 387.5 | 679.3 | 764.1
Gross margin | 56.3 | 104.2 | 145.6 | 190.0
Operating income (loss) | (10.1) | 46.7 | 24.5 | 69.5
Securities earnings | 6.7 | 6.6 | 13.4 | 13.4
Insurance recoveries | 0.3 | 0.4 | 3.4 | 1.2
General expenses, net | (11.2) | (13.9) | (19.4) | (22.2)
Interest expense | (14.5) | (14.6) | (29.1) | (28.3)
Income (loss) before income taxes | (28.8) | 25.2 | (7.2) | 33.6
Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 360.2 | 443.5 | 725.3 | 863.6
Cost of sales | 314.2 | 350.3 | 602.4 | 690.5
Gross margin | 46.0 | 93.2 | 122.9 | 173.1
Operating income (loss) | (7.9) | 46.3 | 26.1 | 73.9
Component Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 28.9 | 26.8 | 56.8 | 52.6
Cost of sales | 19.8 | 18.3 | 39.1 | 36.3
Gross margin | 9.1 | 8.5 | 17.7 | 16.3
Operating income (loss) | 4.3 | 3.9 | 8.0 | 7.2
Waste Management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 10.0 | 11.9 | 25.0 | 18.9
Cost of sales | 12.4 | 11.9 | 24.5 | 22.6
Gross margin | (2.4) |  | 0.5 | (3.7)
Operating income (loss) | (8.1) | (5.0) | (11.0) | (13.5)
Real Estate Management And Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9.7 | 9.5 | 17.8 | 19.0
Cost of sales | 6.1 | 7.0 | 13.3 | 14.7
Gross margin | 3.6 | 2.5 | 4.5 | 4.3
Operating income (loss) | $ 1.6 | $ 1.5 | $ 1.4 | $ 1.9

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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=26872669&loc=d3e20235-122688 + Details
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