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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Payable to affiliates:    
Employee benefits $ 27.8 $ 29.2
Deferred income 25.8 32.0
Accrued sales discounts and rebates 21.4 22.6
Environmental remediation and related costs 14.8 15.3
Reserve for uncertain tax positions 3.3 3.3
Accrued workforce reduction costs 0.2 1.2
Other 43.8 28.8
Total 301.0 281.2
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 95.8 84.9
CompX    
Accounts payable:    
Accounts payable 3.5 2.6
Waste Control Specialists    
Accounts payable:    
Accounts payable 2.1 1.6
BMI and LandWell    
Accounts payable:    
Accounts payable 4.4 2.2
NL    
Accounts payable:    
Accounts payable 1.1 2.4
Other    
Accounts payable:    
Accounts payable 0.3 0.7
Contran | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates 33.6 31.4
Contran | Income Taxes Payables    
Payable to affiliates:    
Payable to affiliates 6.4 5.5
LPC | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates 14.7 14.7
Interest Rate Swap    
Payable to affiliates:    
Hedging liabilities $ 2.0 $ 2.8