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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Payable to affiliates:    
Employee benefits $ 36.8 $ 36.3
Deferred income 24.7 28.3
Accrued sales discounts and rebates 28.8 14.3
Environmental remediation and related costs 19.7 6.8
Interest 1.3 5.5
Other 39.6 33.6
Total 290.0 257.1
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 117.3 107.9
CompX    
Accounts payable:    
Accounts payable 2.8 2.3
BMI and LandWell    
Accounts payable:    
Accounts payable 3.5 3.7
NL    
Accounts payable:    
Accounts payable 1.2 1.8
Other    
Accounts payable:    
Accounts payable 0.4 0.4
Contran | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates 0.1  
LPC | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates $ 13.8 $ 16.2