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Investment in Affiliates and Other Assets - Investment in Affiliates and Other Assets (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Other Noncurrent Assets [Line Items]    
Investment in affiliates $ 88.6 $ 102.3
Other assets:    
Land held for development 160.4 158.1
Restricted cash 11.0 33.3
Deferred financing costs 7.9 2.6
IBNR receivables 7.0 6.9
Capital lease deposit 6.2 6.2
Intangible assets 5.1 5.2
Pension asset 1.0 0.6
Other 32.6 64.9
Total 287.5 337.3
LPC | TiO2 manufacturing joint venture
    
Other Noncurrent Assets [Line Items]    
Investment in affiliates 88.6 102.3
Capitalized Operating Permits
    
Other assets:    
Waste disposal site operating permits, net $ 56.3 $ 59.5