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Acquisition of Remaining Joint Venture Interest in LPC (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 16, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jul. 15, 2024
Business combinations, dispositions and related transactions
Borrowings on credit facilities				$ 484.4	$ 148.6
Gain on remeasurement of investment in TiO2 manufacturing joint venture			$ 64.5		$ 64.5
Non-cash gain		$ 4.6		$ 4.6
Louisiana Pigment Company, L.P. (LPC) | Kronos
Business combinations, dispositions and related transactions
Percentage acquired	50.00%					50.00%
Percentage held through wholly-owned subsidiary	50.00%
Cash consideration	$ 185.0
Louisiana Pigment Company, L.P. (LPC) | Kronos | Global Revolver Credit Facility
Business combinations, dispositions and related transactions
Borrowings on credit facilities	132.1
Louisiana Pigment Company, L.P. (LPC) | Kronos | Maximum
Business combinations, dispositions and related transactions
Earn-out payment	$ 15.0

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