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Long-term debt - Valhi Contran Credit Facility - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Debt Instrument [Line Items] |
Repayments of credit facility | $ 148.9
VALHI, INC. | Contran Credit Facility |
Debt Instrument [Line Items] |
Line of credit maximum borrowing capacity | $ 150.0
Interest rate spread | 1.00%
Debt instrument, Interest rate at period end | 8.50%
Debt due date, start date | Dec. 31, 2026
Debt instrument, interest rate during period | 9.27%
Borrowings | $ 0.0
Repayments of credit facility | 48.8
Amount available for borrowing | $ 105.4

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