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Long-Term Debt - Senior Notes - Additional Information (Detail) € in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 460.4		$ 485.7
Kronos International, Inc | 3.75% Senior Secured Notes due September 15, 2025
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 460.4	€ 400	$ 485.7
Debt instrument interest rate	3.75%	3.75%
Unamortized debt issuance costs	$ 3.8
Debt instrument maturity date	Sep. 15, 2025

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Contractual interest rate for funds borrowed, under the debt agreement.

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