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Business combinations, dispositions and related transactions - Acquisition of Remaining Joint Venture Interest in LPC (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 16, 2024
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Business combinations, dispositions and related transactions        
Borrowings on credit facilities     $ 638.5 $ 158.6
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)        
Business combinations, dispositions and related transactions        
Aggregate carrying value at the acquisition date $ 113.7      
Louisiana Pigment Company, L.P. (LPC) | Kronos Worldwide Inc        
Business combinations, dispositions and related transactions        
Earn-out payment       $ 4.3
Louisiana Pigment Company, L.P. (LPC) | Kronos        
Business combinations, dispositions and related transactions        
Percentage acquired 50.00%      
Percentage held through wholly-owned subsidiary 50.00%      
Earn-out payment $ 15.0      
Goodwill expected to be deductible for tax purposes 0.1      
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 | Minimum        
Business combinations, dispositions and related transactions        
Property and equipment useful life 5 years      
Louisiana Pigment Company, L.P. (LPC) | Kronos | Maximum        
Business combinations, dispositions and related transactions        
Property and equipment useful life 20 years