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Business segment information - Segment Operating Performance (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |
Net sales | $ 499.2 | $ 582.8
Cost of sales | 486.3 | 322.4
Gross margin | 12.9 | 260.4
Operating income (loss) | (45.2) | 203.3
Equity in earnings of investee | (0.3) | 0.1
Securities earnings | 6.6 | 7.1
Insurance recoveries | 0.6 | 1.1
Loss on prepayment of debt | (6.6) |
General expenses, net | (9.7) | (20.3)
Interest expense | (15.4) | (13.5)
Income (loss) from continuing operations before income taxes | (70.0) | 177.8
Chemicals [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 463.6 | 561.3
Cost of sales | 460.3 | 300.4
Gross margin | 3.3 | 260.9
Operating income (loss) | (45.1) | 211.3
Component Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 21.5 | 20.4
Cost of sales | 15.5 | 14.4
Gross margin | 6.0 | 6.0
Operating income (loss) | 1.5 | 1.6
Waste Management [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 14.1 | 1.1
Cost of sales | 10.5 | 7.6
Gross margin | 3.6 | (6.5)
Operating income (loss) | $ (1.6) | $ (9.6)

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 Reference 2: 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=6880815&loc=d3e20235-122688 + Details
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