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Business and Geographic Segments - Segment Operating Performance (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net sales $ 516.8 $ 458.6 $ 415.0 $ 459.3 $ 414.1 $ 475.2 $ 528.6 $ 479.6 $ 1,849.7 $ 1,897.5 $ 1,820.1
Cost of sales                 1,437.6 1,462.9 1,210.9
Gross margin 118.7 89.7 104.0 99.7 91.2 98.4 123.2 121.8 412.1 434.6 609.2
Operating income $ 46.9 $ 28.9 $ 39.3 $ 71.0 25.0 $ 41.4 65.9 $ 60.4 186.1 192.7 370.7
Securities earnings                 4.7 11.2 38.5
Insurance recoveries             7.7   1.6 7.7 1.3
Gain on land sales                 0.5 4.4 12.5
Gain on sale of business         $ 3.0       4.9 3.0 58.4
Other components of net periodic pension and OPEB expense                 (20.1) (16.5) (14.5)
Litigation settlement expense, net             $ (19.3)     (19.3) (62.0)
Changes in market value of Valhi common stock held by subsidiaries                 (1.7) (0.2) (12.2)
General expenses, net                 (34.3) (37.5) (42.4)
Interest expense                 (36.2) (40.8) (55.7)
Income from continuing operations before income taxes                 100.6 104.7 236.2
Depreciation and amortization                 68.5 56.8 58.4
Capital expenditures                 65.5 59.9 61.4
Chemicals                      
Segment Reporting Information [Line Items]                      
Net sales                 1,638.8 1,731.2 1,661.9
Cost of sales                 1,291.0 1,346.8 1,101.7
Gross margin                 347.8 384.4 560.2
Operating income                 126.5 160.1 342.9
Chemicals | Operating Segment                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 61.9 50.2 52.0
Capital expenditures                 62.8 55.1 56.3
Component Products                      
Segment Reporting Information [Line Items]                      
Net sales                 114.5 124.2 118.2
Cost of sales                 81.7 85.3 79.9
Gross margin                 32.8 38.9 38.3
Operating income                 11.8 17.8 17.8
Component Products | Operating Segment                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 3.8 3.7 3.5
Capital expenditures                 1.7 3.2 3.1
Real Estate Management And Development                      
Segment Reporting Information [Line Items]                      
Net sales                 96.4 42.1 40.0
Cost of sales                 64.9 30.8 29.3
Gross margin                 31.5 11.3 10.7
Operating income                 47.8 14.8 10.0
Real Estate Management And Development | Operating Segment                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 2.8 2.9 2.9
Capital expenditures                 $ 1.0 $ 1.6 1.9
Waste Management | Operating Segment                      
Segment Reporting Information [Line Items]                      
Capital expenditures                     $ 0.1