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Fair value measurements and financial instruments - Financial Instruments not Carried at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Reported Value Measurement
Fair value measurements and financial instruments
Cash, cash equivalents and restricted cash equivalents	$ 223.0	$ 378.6
Estimate of Fair Value Measurement
Fair value measurements and financial instruments
Cash, cash equivalents and restricted cash equivalents	223.0	378.6
Kronos Worldwide | Kronos International, Inc
Fair value measurements and financial instruments
Long term debt, carrying amount	37.0	10.0
Long term debt, fair value	37.0	10.0
Kronos Worldwide | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc
Fair value measurements and financial instruments
Long term debt, carrying amount	410.7	365.4
Long term debt, fair value	444.3	403.4
Kronos Worldwide | 3.75% Senior Secured Notes due 2025 | Kronos International, Inc
Fair value measurements and financial instruments
Long term debt, carrying amount	87.9	78.3
Long term debt, fair value	87.8	77.9
LandWell | Bank note payable
Fair value measurements and financial instruments
Long term debt, carrying amount	11.1	11.4
Long term debt, fair value	$ 11.1	$ 11.4

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