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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accounts Payable And Accrued Liabilities [Line Items]    
Accounts payable $ 81.2 $ 96.1
Employee benefits 20.9 14.2
Accrued sales discounts and rebates 19.6 18.9
Reserve for uncertain tax positions 3.3  
Interest rate swap contract 3.3 3.3
Accrued workforce reduction costs 3.0 5.3
Accrued interest 0.1 0.2
Payable to affiliates:    
Other 35.0 34.7
Total 179.1 192.2
Louisiana Pigment Company, L.P.    
Payable to affiliates:    
Payable to affiliates $ 12.7 19.4
Valhi    
Payable to affiliates:    
Payable to affiliates   $ 0.1