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Other assets - Other Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | $ 126.1 | $ 105.7
Other assets: |  |
Restricted cash | 20.9 | 7.6
Deferred financing costs | 7.0 | 2.0
IBNR receivables | 6.7 | 6.5
Capital lease deposit | 6.2 | 6.2
Assets held for sale | 2.6 | 7.3
Other | 46.7 | 67.9
Total | 155.8 | 164.1
Ti02manufacturing Joint Venture [Member] |  |
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | 109.9 | 89.2
Basic Management and Landwell [Member] |  |
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | 16.2 | 16.5
Capitalized Operating Permits [Member] |  |
Other assets: |  |
Waste disposal site operating permits, net | $ 65.7 | $ 66.6

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- Definition Other assets that are held for sale apart from normal operations, not otherwise included elsewhere in the taxonomy and which are anticipated to be sold in less than one year, but by their nature which are not considered current (originally classified based on not being realized or converted to working capital within one year of the date of the statement of financial position or operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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