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Business Segment Information - Segment Operating Performance (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net sales $ 525.3 $ 415.0 $ 1,034.3 $ 874.3
Cost of sales 400.7 311.0 800.4 670.6
Gross margin 124.6 104.0 233.9 203.7
Operating income 55.6 39.3 106.9 110.3
Securities earnings 1.1 1.0 2.0 2.6
Insurance recoveries       1.6
Gain on land and related sales 5.6   5.6 0.5
Changes in market value of Valhi common stock held by subsidiaries 0.9 (0.5) 2.2 (2.9)
Other components of net periodic pension and OPEB expense (4.6) (5.0) (8.9) (9.7)
General expenses, net (9.3) (9.0) (17.4) (17.6)
Interest expense (8.7) (8.8) (17.3) (18.5)
Income before income taxes 40.6 17.0 73.1 66.3
Chemicals        
Segment Reporting Information [Line Items]        
Net sales 478.6 386.0 943.6 807.0
Cost of sales 369.9 291.1 739.6 624.5
Gross margin 108.7 94.9 204.0 182.5
Operating income 47.4 35.9 85.1 82.7
Component Products        
Segment Reporting Information [Line Items]        
Net sales 36.3 23.8 72.2 56.1
Cost of sales 24.9 16.4 49.8 38.3
Gross margin 11.4 7.4 22.4 17.8
Operating income 5.8 2.4 11.6 7.4
Real Estate Management And Development        
Segment Reporting Information [Line Items]        
Net sales 10.4 5.2 18.5 11.2
Cost of sales 5.9 3.5 11.0 7.8
Gross margin 4.5 1.7 7.5 3.4
Operating income $ 2.4 $ 1.0 $ 10.2 $ 20.2