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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Accrued liabilities:    
Employee benefits $ 25.5 $ 24.7
Deferred income 21.3 21.8
Sales discounts and rebates 19.6 23.9
Environmental remediation and related costs 14.2 11.7
Reserve for uncertain tax positions 5.6  
Workforce reduction costs 3.3 5.3
Other 33.7 30.4
Total 270.3 271.4
Kronos Worldwide, Inc.    
Accounts payable:    
Accounts payable 89.3 96.1
CompX    
Accounts payable:    
Accounts payable 3.2 2.7
WCS    
Accounts payable:    
Accounts payable 1.8 1.3
BMI and LandWell    
Accounts payable:    
Accounts payable 3.7 2.1
Other    
Accounts payable:    
Accounts payable 2.8 2.6
Contran | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates 28.7 26.1
LPC | Trade Accounts Payables    
Payable to affiliates:    
Payable to affiliates 14.2 19.4
Interest Rate Swap    
Accrued liabilities:    
Hedging liabilities $ 3.4 $ 3.3