Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Accounts Payable And Accrued Liabilities [Line Items]
Accounts payable	$ 93.4	$ 96.1
Accrued sales discounts and rebates	13.5	18.9
Employee benefits	15.7	14.2
Accrued workforce reduction costs	4.8	5.3
Interest rate swap contract	3.4	3.3
Accrued interest	0.1	0.2
Payable to affiliates:
Other	36.7	34.7
Total	182.1	192.2
Louisiana Pigment Company, L.P.
Payable to affiliates:
Payable to affiliates	$ 14.5	19.4
Valhi
Payable to affiliates:
Payable to affiliates		$ 0.1