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Fair Value Measurements and Financial Instruments - Financial Instruments not Carried at Fair Value (Detail) - USD ($)
$ in Millions
Mar. 31, 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 $ 26.0  
Long term debt, fair value 26.0  
Kronos Worldwide, Inc. | Term Loan | 2014 Term Loan    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 335.4 $ 335.9
Long term debt, fair value 340.8 334.6
VALHI, INC. | Contran Credit Facility    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 278.9 278.9
Long term debt, fair value 278.9 278.9
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    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 19.5  
Long term debt, fair value 20.5  
LandWell | Unsecured Debt    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 2.9 2.9
Long term debt, fair value 2.9 2.9
Financing capital lease | WCS | Financing Capital Lease Obligation | Andrews County capital lease    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long term debt, carrying amount 63.6 64.0
Long term debt, fair value 63.6 64.0
Reported Value Measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash equivalents 246.8 191.0
Deferred payment obligation 9.1 9.0
Estimate of Fair Value Measurement    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Cash, cash equivalents and restricted cash equivalents 246.8 191.0
Deferred payment obligation $ 9.1 $ 9.0