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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

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