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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounts Payable And Accrued Liabilities [Line Items]    
Accounts payable $ 108.9 $ 137.2
Employee benefits 29.0 21.1
Accrued sales discounts and rebates 23.7 32.4
Operating lease liabilities 6.7 6.2
Other 30.7 40.8
Total 211.6 259.0
LPC    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate 5.6 16.4
Valhi | Income taxes    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate $ 7.0 $ 4.9