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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounts Payable And Accrued Liabilities [Line Items]    
Accounts payable $ 123.4 $ 111.0
Employee benefits 29.8 27.8
Accrued sales discounts and rebates 22.7 29.1
Operating lease liabilities $ 4.6 $ 6.7
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total Total
Other $ 42.5 $ 41.3
Total 246.9 243.8
LPC    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate 17.6 19.3
Valhi | Income taxes    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate $ 6.3 $ 8.6