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Other Noncurrent Assets - Other Noncurrent Assets (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Other Noncurrent Assets [Line Items]    
Investment in affiliates $ 121.3 $ 126.1
Other assets:    
Restricted cash 22.4 20.9
Deferred financing costs 2.6 7.0
IBNR receivables 7.0 6.7
Capital lease deposit 6.2 6.2
Pension asset 5.8 5.1
Assets held for sale 1.1 2.6
Other 68.0 46.9
Total 174.6 161.1
TiO2 manufacturing joint venture, Louisiana Pigment Company, L.P. (“LPC”)
   
Other Noncurrent Assets [Line Items]    
Investment in affiliates 105.9 109.9
Other
   
Other Noncurrent Assets [Line Items]    
Investment in affiliates 15.4 16.2
Capitalized Operating Permits
   
Other assets:    
Waste disposal site operating permits, net $ 61.5 $ 65.7