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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - VALHI, INC. - Contran Credit Facility
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Debt Instrument [Line Items]  
Debt instrument, Interest rate at period end 4.50%
Debt instrument, Interest rate during period 4.29%
Amount available for borrowing $ 57.8
Borrowings of credit facility 0.0
Repaid credit facility $ 5.7