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Business and geographic segments - Segment Operating Performance (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 427.4 | $ 508.7 | $ 568.4 | $ 582.8 | $ 456.7 | $ 568.6 | $ 558.9 | $ 440.9 | $ 2,087.3 | $ 2,025.1 | $ 1,533.5
Cost of sales |  |  |  |  |  |  |  |  | 1,512.1 | 1,278.4 | 1,184.3
Gross margin | 55.3 | 97.4 | 162.1 | 260.4 | 192.9 | 210.2 | 197.3 | 146.3 | 575.2 | 746.7 | 349.2
Operating income (loss) | (2.2) | 41.1 | 103.2 | 203.3 | 136.5 | 149.4 | 139.1 | 96.4 | 345.4 | 521.4 | 158.3
Equity in earnings of joint venture General corporate items: |  |  |  |  |  |  |  |  | (0.2) | (0.5) | (0.4)
Securities earnings |  |  |  |  |  |  |  |  | 50.2 | 28.6 | 26.3
Insurance recoveries |  |  |  |  |  | 8.7 |  |  | 3.3 | 16.9 | 18.8
Litigation settlement gains |  |  |  |  |  |  |  |  | 14.7 |  | 6.3
Gain on sale of excess property |  |  |  |  |  |  |  |  | 3.2 |  |
Litigation settlement expense |  |  |  |  |  |  |  |  |  |  | (32.2)
Goodwill impairment | (5.3) |  |  |  |  |  |  |  | (6.4) |  |
General expenses, net |  |  |  |  |  |  |  |  | (45.3) | (40.7) | (29.9)
Loss on prepayment of debt, net |  |  | 3.7 |  |  |  |  | 1.7 | (7.2) | (3.1) |
Interest expense |  |  |  |  |  |  |  |  | (56.3) | (61.8) | (68.4)
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 301.4 | 460.8 | 78.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 69.4 | 63.8 | 62.1
Capital expenditures |  |  |  |  |  |  |  |  | 98.8 | 146.2 | 44.7
Chemicals [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,976.3 | 1,943.3 | 1,449.7
Cost of sales |  |  |  |  |  |  |  |  | 1,418.2 | 1,197.5 | 1,106.7
Gross margin |  |  |  |  |  |  |  |  | 558.1 | 745.8 | 343.0
Operating income (loss) |  |  |  |  |  |  |  |  | 366.8 | 553.0 | 183.2
Depreciation and amortization |  |  |  |  |  |  |  |  | 50.4 | 50.2 | 47.4
Capital expenditures |  |  |  |  |  |  |  |  | 74.9 | 68.6 | 37.7
Component Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 83.2 | 79.8 | 76.1
Cost of sales |  |  |  |  |  |  |  |  | 58.9 | 55.6 | 53.7
Gross margin |  |  |  |  |  |  |  |  | 24.3 | 24.2 | 22.4
Operating income (loss) |  |  |  |  |  |  |  |  | 5.4 | 6.4 | 5.9
Depreciation and amortization |  |  |  |  |  |  |  |  | 5.8 | 6.8 | 7.7
Capital expenditures |  |  |  |  |  |  |  |  | 4.3 | 3.2 | 2.1
Waste Management [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 27.8 | 2.0 | 7.7
Cost of sales |  |  |  |  |  |  |  |  | 35.0 | 25.3 | 23.9
Gross margin |  |  |  |  |  |  |  |  | (7.2) | (23.3) | (16.2)
Operating income (loss) |  |  |  |  |  |  |  |  | (26.8) | (38.0) | (30.8)
Depreciation and amortization |  |  |  |  |  |  |  |  | 13.2 | 6.8 | 7.0
Capital expenditures |  |  |  |  |  |  |  |  | 19.6 | 74.3 | 4.9
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | $ 0.1 |

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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