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v3.21.1

Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Net sales | $ 509.0 | $ 459.3
Cost of sales | 399.7 | 359.6
Gross margin | 109.3 | 99.7
Operating income | 51.3 | 71.0
Securities earnings | 0.9 | 1.6
Insurance recoveries |  | 1.6
Changes in market value of Valhi common stock held by subsidiaries | 1.3 | (2.4)
Other components of net periodic pension and OPEB expense | (4.3) | (4.7)
General expenses, net | (8.1) | (8.1)
Interest expense | (8.6) | (9.7)
Income before income taxes | 32.5 | 49.3
Chemicals |  |
Segment Reporting Information [Line Items] |  |
Net sales | 465.0 | 421.0
Cost of sales | 369.7 | 333.3
Gross margin | 95.3 | 87.7
Operating income | 37.7 | 46.8
Component Products |  |
Segment Reporting Information [Line Items] |  |
Net sales | 35.9 | 32.3
Cost of sales | 24.9 | 21.9
Gross margin | 11.0 | 10.4
Operating income | 5.8 | 5.0
Real Estate Management And Development |  |
Segment Reporting Information [Line Items] |  |
Net sales | 8.1 | 6.0
Cost of sales | 5.1 | 4.4
Gross margin | 3.0 | 1.6
Operating income | $ 7.8 | $ 19.2

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