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Business segment information - Segment Operating Performance (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 16, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business segment information [Line Items] |  |  |  |  |  |
Net sales |  | $ 533.6 | $ 468.9 |  | $ 1,623.9 | $ 1,468.7
Cost of sales |  | 417.3 | 408.3 |  | 1,300.0 | 1,288.5
Gross margin |  | 116.3 | 60.6 |  | 323.9 | 180.2
Operating income |  | 67.7 | 2.5 |  | 154.0 | 17.0
Interest income and other |  | 5.4 | 4.9 |  | 16.6 | 14.5
Gain on remeasurement of investment in TiO2 manufacturing joint venture | $ 64.5 | 64.5 |  |  | 64.5 | 0.0
Insurance recoveries |  |  |  |  | 1.3 | 2.9
Gain on land sales |  |  |  | $ 1.5 | 0.0 | 1.5
Other components of net periodic pension and OPEB expense |  | (0.6) | (1.3) |  | (1.8) | (10.0)
Changes in market value of Valhi common stock held by subsidiaries |  | 3.7 | 0.1 |  | 4.3 | (2.1)
General expenses, net |  | (8.5) | (8.8) |  | (26.8) | (26.3)
Interest expense |  | (13.4) | (7.2) |  | (36.6) | (21.4)
Income (loss) before income taxes |  | 119.9 | (9.5) |  | 175.5 | (26.4)
Chemicals |  |  |  |  |  |
Business segment information [Line Items] |  |  |  |  |  |
Net sales |  | 484.7 | 396.9 |  | 1,464.0 | 1,266.4
Cost of sales |  | 384.4 | 362.8 |  | 1,193.0 | 1,158.0
Gross margin |  | 100.3 | 34.1 |  | 271.0 | 108.4
Operating income |  | 42.6 | (21.8) |  | 105.9 | (39.5)
Insurance recoveries |  |  | 0.3 |  |  | 2.5
Component products |  |  |  |  |  |
Business segment information [Line Items] |  |  |  |  |  |
Net sales |  | 33.6 | 40.3 |  | 107.5 | 118.1
Cost of sales |  | 24.1 | 27.7 |  | 77.2 | 82.5
Gross margin |  | 9.5 | 12.6 |  | 30.3 | 35.6
Operating income |  | 3.3 | 6.6 |  | 12.1 | 18.0
Real estate management and development |  |  |  |  |  |
Business segment information [Line Items] |  |  |  |  |  |
Net sales |  | 15.3 | 31.7 |  | 52.4 | 84.2
Cost of sales |  | 8.8 | 17.8 |  | 29.8 | 48.0
Gross margin |  | 6.5 | 13.9 |  | 22.6 | 36.2
Operating income |  | $ 21.8 | $ 17.7 |  | $ 36.0 | $ 38.5

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