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Business segment information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Business segment information [Line Items] |  |  |  |
Net sales | $ 559.7 | $ 507.1 | $ 1,090.3 | $ 999.8
Cost of sales | 438.4 | 441.6 | 882.7 | 880.2
Gross margin | 121.3 | 65.5 | 207.6 | 119.6
Operating income | 54.8 | 12.0 | 86.3 | 14.5
Interest income and other | 5.5 | 4.7 | 11.2 | 9.6
Gain on land sales |  | 1.5 | 0.0 | 1.5
Other components of net periodic pension and OPEB expense | (0.6) | (7.5) | (1.2) | (8.7)
Changes in market value of Valhi common stock held by subsidiaries | 0.1 | (1.1) | 0.6 | (2.2)
General expenses, net | (10.3) | (9.5) | (18.1) | (17.4)
Interest expense | (11.9) | (7.2) | (23.2) | (14.2)
Income (loss) before income taxes | 37.6 | (7.1) | 55.6 | (16.9)
Insurance recoveries |  |  | 0.2 | 2.2
Chemicals |  |  |  |
Business segment information [Line Items] |  |  |  |
Net sales | 500.5 | 443.2 | 979.3 | 869.5
Cost of sales | 400.7 | 399.4 | 808.6 | 795.2
Gross margin | 99.8 | 43.8 | 170.7 | 74.3
Operating income | 40.5 | (2.6) | 63.3 | (17.7)
Insurance recoveries |  | 0.5 |  | 2.2
Component products |  |  |  |
Business segment information [Line Items] |  |  |  |
Net sales | 35.9 | 36.6 | 73.9 | 77.8
Cost of sales | 24.8 | 26.3 | 53.1 | 54.8
Gross margin | 11.1 | 10.3 | 20.8 | 23.0
Operating income | 5.1 | 4.4 | 8.8 | 11.4
Real estate management and development |  |  |  |
Business segment information [Line Items] |  |  |  |
Net sales | 23.3 | 27.3 | 37.1 | 52.5
Cost of sales | 12.9 | 15.9 | 21.0 | 30.2
Gross margin | 10.4 | 11.4 | 16.1 | 22.3
Operating income | $ 9.2 | $ 10.2 | $ 14.2 | $ 20.8

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