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Long-Term Debt - Valhi Contran Credit Facility - Additional Information (Detail) - VALHI, INC. - Contran Credit Facility
$ in Millions
6 Months Ended
Jun. 30, 2022
USD ($)
Debt Instrument [Line Items]  
Debt instrument, Interest rate at period end 5.75%
Debt instrument, Interest rate during period 4.61%
Amount available for borrowing $ 71.6
Borrowings of credit facility 0.1
Repayments of credit facility $ 19.6