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Related Party Transactions - Receivables from and Payables to Affiliates (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current receivables from affiliates:    
Receivable from affiliates $ 7.3 $ 13.5
Current payables to affiliates:    
Payable to affiliates 20.4 26.7
Contran    
Current receivables from affiliates:    
Contran trade items 0.4 0.5
Current payables to affiliates:    
Contran income taxes 4.0 10.0
Noncurrent payable to affiliates:    
Contran - income taxes 56.3 56.3
Louisiana Pigment Company    
Current receivables from affiliates:    
Receivable from affiliates 4.7 10.2
Current payables to affiliates:    
Payable to affiliates 16.4 16.7
VALHI, INC. | Contran | Credit Facility    
Noncurrent payable to affiliates:    
Payables to affiliate included in long-term debt 313.0 314.3
Other    
Current receivables from affiliates:    
Receivable from affiliates $ 2.2 $ 2.8