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Other assets - Summary of Financial Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2012 LPC [Member] | Dec. 31, 2011 LPC [Member] | Dec. 31, 2010 LPC [Member] | Dec. 31, 2012 LPC [Member] Kronos Worldwide, Inc. [Member] | Dec. 31, 2011 LPC [Member] Kronos Worldwide, Inc. [Member] | Dec. 31, 2010 LPC [Member] Kronos Worldwide, Inc. [Member] | Dec. 31, 2012 LPC [Member] Tioxide [Member] | Dec. 31, 2011 LPC [Member] Tioxide [Member] | Dec. 31, 2010 LPC [Member] Tioxide [Member] | Sep. 30, 2012 Basic Management and Landwell [Member] | Sep. 30, 2011 Basic Management and Landwell [Member] | Sep. 30, 2010 Basic Management and Landwell [Member]
Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 1,363.4 |  |  |  | $ 944.2 |  |  |  | $ 1,363.4 | $ 944.2 |  | $ 139.8 | $ 108.5 |  |  |  |  |  |  |  | $ 25.7 | $ 16.1 |
Total revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.4 | 10.0 | 6.9
Prepaid costs and other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.6 | 19.9 |
Loss before income taxes |  |  |  |  |  |  |  |  | 301.4 | 460.8 | 78.8 |  |  |  |  |  |  |  |  |  | (1.2) | (2.7) | (4.6)
Property and equipment, net | 763.1 |  |  |  | 723.8 |  |  |  | 763.1 | 723.8 | 646.1 | 126.0 | 140.7 |  |  |  |  |  |  |  | 6.4 | 6.5 |
Investment in undeveloped land and water rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.0 | 40.4 |
Land and development costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.7 | 13.5 |
Total assets | 3,170.5 |  |  |  | 2,838.0 |  |  |  | 3,170.5 | 2,838.0 | 2,714.3 | 265.8 | 249.2 |  |  |  |  |  |  |  | 98.4 | 96.4 |
Current liabilities | 398.5 |  |  |  | 415.6 |  |  |  | 398.5 | 415.6 |  |  |  |  |  |  |  |  |  |  | 14.2 | 5.7 |
Other liabilities, primarily current | 42.5 |  |  |  | 71.7 |  |  |  | 42.5 | 71.7 |  | 43.2 | 68.0 |  |  |  |  |  |  |  |  |  |
Long-term debt | 880.5 |  |  |  | 717.4 |  |  |  | 880.5 | 717.4 |  |  |  |  |  |  |  |  |  |  | 14.3 | 16.2 |
Partners' equity |  |  |  |  |  |  |  |  |  |  |  | 222.6 | 181.2 |  |  |  |  |  |  |  |  |  |
Deferred income taxes | 454.8 |  |  |  | 457.2 |  |  |  | 454.8 | 457.2 |  |  |  |  |  |  |  |  |  |  | 6.0 | 5.9 |
Other noncurrent liabilities | 78.3 |  |  |  | 55.4 |  |  |  | 78.3 | 55.4 |  |  |  |  |  |  |  |  |  |  | 3.4 | 6.7 |
Equity | 733.6 |  |  |  | 657.2 |  |  |  | 733.6 | 657.2 |  |  |  |  |  |  |  |  |  |  | 60.5 | 61.9 |
Total liabilities and equity | 3,170.5 |  |  |  | 2,838.0 |  |  |  | 3,170.5 | 2,838.0 |  | 265.8 | 249.2 |  |  |  |  |  |  |  | 98.4 | 96.4 |
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 | 477.7 | 290.5 | 268.2 | 250.2 | 144.8 | 133.7 | 227.5 | 145.7 | 134.5 |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 1,512.1 | 1,278.4 | 1,184.3 | 477.3 | 290.1 | 267.7 |  |  |  |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  | 273.3 | 268.9 | 227.1 | 0.4 | 0.4 | 0.5 |  |  |  |  |  |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 1,856.5 | 1,613.3 | 1,513.6 | 477.7 | 290.5 | 268.2 |  |  |  |  |  |  |  |  |
Net income | $ 9.2 | $ 31.8 | $ 61.5 | $ 119.6 | $ 75.8 | $ 93.1 | $ 72.9 | $ 53.2 | $ 222.1 | $ 295.0 | $ 63.8 |  |  |  |  |  |  |  |  |  | $ (1.4) | $ (2.1) | $ (3.6)

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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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- 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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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Paragraph 5A -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E + Details
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- Definition Investment In Undeveloped Land And Water Rights + References No definition available. + Details
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