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Fair Value Measurements and Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Kronos Worldwide, Inc. | Revolving North American Credit Facility    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount $ 16.3  
Long term debt, fair value 16.3  
Kronos Worldwide, Inc. | Term Loan | 2014 Term Loan    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 334.9 $ 335.9
Long term debt, fair value 340.3 334.6
VALHI, INC. | Contran Credit Facility    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 282.7 278.9
Long term debt, fair value 282.7 278.9
VALHI, INC. | Term Loan | Snake River    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 250.0 250.0
Long term debt, fair value 250.0 250.0
Tremont | Promissory Note    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 14.5 14.5
Long term debt, fair value 14.5 14.5
BMI | Bank note payable | Meadows Term Loan    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount   8.4
Long term debt, fair value   8.5
BMI | Loan Agreement | Western Alliance Bank    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 18.7  
Long term debt, fair value 19.7  
LandWell | Unsecured Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 2.7 2.9
Long term debt, fair value 2.7 2.9
Financing capital lease | Waste Control Specialists | Financing Capital Lease Obligation | Andrews County capital lease    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 63.1 64.0
Long term debt, fair value 63.1 64.0
Reported Value Measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash equivalents 267.0 191.0
Deferred payment obligation 9.2 9.0
Estimate of Fair Value Measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash equivalents 267.0 191.0
Deferred payment obligation $ 9.2 $ 9.0