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Other noncurrent assets - Other Noncurrent Assets (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | $ 116.0 | $ 126.1
Other assets: |  |
Restricted cash | 21.3 | 20.9
Deferred financing costs | 3.9 | 7.0
IBNR receivables | 6.8 | 6.7
Capital lease deposit | 6.2 | 6.2
Pension asset | 4.7 | 5.1
Assets held for sale | 1.0 | 2.6
Other | 56.9 | 46.9
Total | 165.1 | 161.1
TiO2 manufacturing joint venture, Louisiana Pigment Company, L.P. ("LPC") [Member] |  |
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | 100.1 | 109.9
Other [Member] |  |
Other Noncurrent Assets [Line Items] |  |
Investment in affiliates | 15.9 | 16.2
Capitalized Operating Permits [Member] |  |
Other assets: |  |
Waste disposal site operating permits, net | $ 64.3 | $ 65.7

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