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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Payable to affiliates:    
Accrued litigation settlement $ 11.9 $ 11.8
Employee benefits 32.9 37.5
Operating lease liabilities 5.6 6.7
Accrued sales discounts and rebates 19.5 30.2
Deferred income 15.5 20.1
Environmental remediation and related costs 3.9 3.4
Interest 5.6 5.7
Other 34.5 39.4
Total 252.1 300.0
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 87.5 111.0
CompX    
Accounts payable:    
Accounts payable 3.8 2.6
BMI and LandWell    
Accounts payable:    
Accounts payable 9.1 3.6
Other    
Accounts payable:    
Accounts payable 0.2 0.4
Contran | Income Taxes Payable    
Payable to affiliates:    
Payable to affiliates 5.3 8.3
Louisiana Pigment Company, L.P. ("LPC")    
Payable to affiliates:    
Payable to affiliates $ 16.8 $ 19.3