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Amount, after accumulated amortization, of debt premium.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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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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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Long-term debt - Senior Notes (Details) € in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Long-term debt
Revolving credit facility		$ 43.2		$ 10.0
3.75% Senior Secured Notes due 2025
Long-term debt
Debt instrument interest rate		3.75%	3.75%	3.75%
Debt instrument principal amount \| €			€ 75,000
9.50% Senior Secured Notes due 2029
Long-term debt
Debt instrument interest rate		9.50%	9.50%	9.50%
Kronos International, Inc \| 3.75% Senior Secured Notes due 2025
Long-term debt
Debt instrument interest rate		3.75%	3.75%	3.75%
Debt instrument principal amount \| €			€ 75,000
Principal amount outstanding		$ 81.2		$ 78.3
Kronos International, Inc \| 9.50% Senior Secured Notes due 2029
Long-term debt
Debt instrument interest rate		9.50%	9.50%	9.50%
Debt instrument principal amount \| €			€ 351,174
Principal amount outstanding		$ 379.1		$ 365.4
Unamortized premium		5.1
Debt issuance costs		$ 6.1
Interest expense	$ 1.5