The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

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-Name Accounting Standards Codification
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- Definition

The effective interest rate during the reporting period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Long-term debt - Revolving Credit Facility - Additional Information (Details) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Jul. 17, 2025 USD ($)	Jul. 17, 2025 EUR (€)	Jul. 16, 2025 USD ($)	Jul. 16, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Long-term debt
Borrowings on credit facilities	$ 484.4	$ 148.6
Kronos Worldwide
Long-term debt
Revolving credit facility	70.2						$ 10.0
Kronos Worldwide \| Global Revolver Credit Facility
Long-term debt
Revolving credit facility	70.2
Line of credit maximum borrowing capacity			$ 350.0		$ 300.0
Kronos Worldwide \| Global Revolver Credit Facility
Long-term debt
Borrowings on credit facilities	492.8
Repayment of credit facility	$ 432.6
Debt instrument, Interest rate during period	6.40%
Debt instrument, Interest rate at period end	5.70%
Amount available for borrowing	$ 342.0
Kronos Worldwide \| Belgian Subsidiary Revolving Borrowings Maximum \| Global Revolver
Long-term debt
Line of credit maximum borrowing capacity \| €				€ 55		€ 30
Kronos Worldwide \| German Subsidiary Revolving Borrowings Maximum \| Global Revolver
Long-term debt
Line of credit maximum borrowing capacity \| €				€ 85		€ 60