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Related Party Transactions - Receivables from and Payables to Affiliates (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current receivables from affiliates:    
Receivable from affiliates $ 32.6 $ 3.2
Current payables to affiliates:    
Payable to affiliates 16.2 20.2
Contran    
Current receivables from affiliates:    
Trade items 1.0 0.4
Income taxes 19.4  
Current payables to affiliates:    
Contran income taxes   5.5
Noncurrent payable to affiliates:    
Contran – income taxes 70.1  
Louisiana Pigment Company    
Current receivables from affiliates:    
Receivable from affiliates 8.9  
Current payables to affiliates:    
Payable to affiliates 16.2 14.7
VALHI, INC. | Contran | Credit Facility    
Noncurrent payable to affiliates:    
Payables to affiliate included in long-term debt 284.3 278.9
Other    
Current receivables from affiliates:    
Receivable from affiliates $ 3.3 $ 2.8