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Business segment information - Segment Operating Performance (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Business segment information        
Net sales $ 503.5 $ 533.6 $ 1,582.5 $ 1,623.9
Cost of sales 442.9 417.3 1,321.3 1,300.0
Gross margin 60.6 116.3 261.2 323.9
Operating income 8.6 67.7 94.2 154.0
Interest income and other 4.6 5.4 12.6 16.6
Gain on remeasurement of investment in TiO2 manufacturing joint venture   64.5   64.5
Gain on remeasurement of earn-out liability 4.6   4.6  
Insurance recoveries   1.1   1.3
Other components of net periodic pension and OPEB expense (0.9) (0.6) (2.4) (1.8)
Changes in market value of Valhi common stock held by subsidiaries (0.1) 3.7 (1.8) 4.3
General expenses, net (9.5) (8.5) (26.6) (26.8)
Interest expense (14.9) (13.4) (41.9) (36.6)
Income (loss) before income taxes (7.6) 119.9 38.7 175.5
Chemicals        
Business segment information        
Net sales 456.9 484.7 1,441.1 1,464.0
Cost of sales 410.4 384.4 1,225.9 1,193.0
Gross margin 46.5 100.3 215.2 271.0
Operating income (15.9) 42.6 35.6 105.9
Component products        
Business segment information        
Net sales 40.0 33.6 120.6 107.5
Cost of sales 29.0 24.1 84.5 77.2
Gross margin 11.0 9.5 36.1 30.3
Operating income 4.8 3.3 17.0 12.1
Real estate management and development        
Business segment information        
Net sales 6.6 15.3 20.8 52.4
Cost of sales 3.5 8.8 10.9 29.8
Gross margin 3.1 6.5 9.9 22.6
Operating income $ 19.7 $ 21.8 $ 41.6 $ 36.0