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Financial instruments- Financial Instruments not Carried at Fair Value (Details)
€ in Thousands, $ in Millions
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Reported Value Measurement      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Cash, cash equivalents and restricted cash equivalents   $ 378.6 $ 462.0
Estimate of Fair Value Measurement      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Cash, cash equivalents and restricted cash equivalents   378.6 462.0
Kronos Worldwide | Kronos International, Inc      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Long term debt, carrying amount   10.0  
Long term debt, fair value   10.0  
Kronos Worldwide | 9.50% Senior Secured Notes due 2029 | Kronos International, Inc      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Long term debt, carrying amount € 351,174 365.4  
Long term debt, fair value   403.4  
Kronos Worldwide | 3.75% Senior Secured Notes due 2025 | Kronos International, Inc      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Long term debt, carrying amount   78.3 440.9
Long term debt, fair value   77.9 424.5
LandWell | Bank note payable      
Fair Value Balance Sheet Grouping Financial Statement Captions      
Long term debt, carrying amount   11.4 12.2
Long term debt, fair value   $ 11.4 $ 12.2