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Fair value measurements and financial instruments - Financial instruments recorded on a fair value (Details) € in Millions, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 EUR (€)	Sep. 15, 2025 EUR (€)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Fair value measurements and financial instruments
Market value, current		$ 3.1	$ 3.1					$ 1.9
Market value, noncurrent		5.8	5.8					5.7
Earn-out liability								$ (4.3)
Foreign currency transaction loss		0.4
Foreign currency transaction gain			2.8
Currency transactions, net			3.2	$ 4.9
Foreign exchange forward | Kronos | Kronos International, Inc
Fair value measurements and financial instruments
Contract to purchase | €							€ 25
Exchange rate							1.05
Cash received from contract settlement	$ 2.8
Currency forward contract		$ 0.0	$ 0.0
3.75% Senior Secured Notes due 2025 | Kronos | Kronos International, Inc
Fair value measurements and financial instruments
Debt instrument principal amount | €					€ 75	€ 75
Debt instrument interest rate		3.75%	3.75%		3.75%	3.75%		3.75%
Quoted prices in active markets (Level 1)
Fair value measurements and financial instruments
Market value, noncurrent		$ 2.9	$ 2.9					$ 2.6
Significant other observable input (Level 2)
Fair value measurements and financial instruments
Market value, current		3.1	3.1					1.9
Market value, noncurrent		$ 2.9	$ 2.9					3.1
Significant unobservable inputs (Level 3)
Fair value measurements and financial instruments
Earn-out liability								$ (4.3)

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