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Business Segment Information - Segment Operating Performance (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 491.7 | $ 516.0 | $ 954.1 | $ 1,015.2
Cost of sales | 387.5 | 498.8 | 764.1 | 985.1
Gross margin | 104.2 | 17.2 | 190.0 | 30.1
Operating income (loss) | 46.7 | (46.8) | 69.5 | (92.0)
Equity in earnings of investees |  |  |  | (0.8)
Securities earnings | 6.6 | 6.7 | 13.4 | 13.3
Insurance recoveries | 0.4 | 1.0 | 1.2 | 1.6
Loss on prepayment of debt |  |  |  | (6.6)
General expenses, net | (13.9) | (21.6) | (22.2) | (31.3)
Interest expense | (14.6) | (14.7) | (28.3) | (30.1)
Income (loss) before income taxes | 25.2 | (75.9) | 33.6 | (145.9)
Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 443.5 | 481.1 | 863.6 | 944.7
Cost of sales | 350.3 | 472.1 | 690.5 | 932.4
Gross margin | 93.2 | 9.0 | 173.1 | 12.3
Operating income (loss) | 46.3 | (45.3) | 73.9 | (90.4)
Component products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 26.8 | 24.0 | 52.6 | 45.5
Cost of sales | 18.3 | 16.4 | 36.3 | 31.9
Gross margin | 8.5 | 7.6 | 16.3 | 13.6
Operating income (loss) | 3.9 | 2.9 | 7.2 | 4.4
Waste management |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 11.9 | 10.9 | 18.9 | 25.0
Cost of sales | 11.9 | 10.3 | 22.6 | 20.8
Gross margin |  | 0.6 | (3.7) | 4.2
Operating income (loss) | (5.0) | (4.4) | (13.5) | (6.0)
Real Estate Management And Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 9.5 |  | 19.0 |
Cost of sales | 7.0 |  | 14.7 |
Gross margin | 2.5 |  | 4.3 |
Operating income (loss) | 1.5 |  | 1.9 |
Corporate segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity in earnings of investees |  | $ (0.5) |  | $ (0.8)

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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=26872669&loc=d3e20235-122688 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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