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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Payable to affiliates:    
Accrued litigation settlement $ 11.8 $ 11.8
Employee benefits 40.0 37.5
Operating lease liabilities 4.6 6.7
Accrued sales discounts and rebates 24.0 30.2
Deferred income 35.3 20.1
Environmental remediation and related costs 3.6 3.4
Interest 1.5 5.7
Other 44.2 39.4
Total 321.7 300.0
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 123.4 111.0
CompX    
Accounts payable:    
Accounts payable 4.5 2.6
BMI and LandWell    
Accounts payable:    
Accounts payable 5.8 3.6
Other    
Accounts payable:    
Accounts payable 0.3 0.4
Contran | Income Taxes Payable    
Payable to affiliates:    
Payable to affiliates 5.1 8.3
LPC    
Payable to affiliates:    
Payable to affiliates $ 17.6 $ 19.3