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Business Segment Information - Segment Operating Performance (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 510.2 | $ 481.8 | $ 976.2 | $ 887.1
Cost of sales | 326.2 | 338.0 | 606.9 | 626.7
Gross margin | 184.0 | 143.8 | 369.3 | 260.4
Operating income (loss) | 130.0 | 83.1 | 248.8 | 147.2
Securities earnings | 8.5 | 7.1 | 16.8 | 14.1
Insurance recoveries | 0.2 |  | 0.4 | 0.1
Gain on land sales |  |  | 12.5 |
Other components of net periodic pension and OPEB expense | (3.8) | (4.3) | (7.5) | (8.4)
Litigation settlement expense | (62.0) |  | (62.0) |
General expenses, net | (14.9) | (8.7) | (29.2) | (19.2)
Interest expense | (16.0) | (14.7) | (31.4) | (29.2)
Income from continuing operations before income taxes | 42.0 | 62.5 | 148.4 | 104.6
Chemicals |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 471.8 | 441.4 | 902.2 | 811.2
Cost of sales | 300.5 | 309.6 | 556.6 | 573.8
Gross margin | 171.3 | 131.8 | 345.6 | 237.4
Operating income (loss) | 123.6 | 77.2 | 234.2 | 136.3
Component Products |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 32.4 | 30.1 | 60.8 | 60.0
Cost of sales | 21.2 | 20.5 | 40.1 | 40.8
Gross margin | 11.2 | 9.6 | 20.7 | 19.2
Operating income (loss) | 6.0 | 4.6 | 10.4 | 9.1
Real Estate Management And Development |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 6.0 | 10.3 | 13.2 | 15.9
Cost of sales | 4.5 | 7.9 | 10.2 | 12.1
Gross margin | 1.5 | 2.4 | 3.0 | 3.8
Operating income (loss) | $ 0.4 | $ 1.3 | $ 4.2 | $ 1.8

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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://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=115205541&loc=SL114868664-224227 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 + Details
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