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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

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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