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Accounts Payable and Accrued Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts Payable And Accrued Liabilities [Line Items]    
Accounts payable $ 139.4 $ 103.2
Employee benefits 21.1 27.9
Accrued sales discounts and rebates 19.1 29.7
Operating lease liabilities 6.7  
Other 41.5 35.0
Total 247.3 222.9
LPC    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate 13.9 16.7
Valhi | Income taxes, net    
Accounts Payable And Accrued Liabilities [Line Items]    
Payables to affiliate $ 5.6 $ 10.4