The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.2,3)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Other Income, Net - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Other Income Net Additional Information Detail [Line Items]
Dividends and interest income				$ 29.4	$ 26.7	$ 26.4
Insurance recoveries				0.4	0.4	3.7
Income received from settlement of business interruption insurance claim	$ 0.9	$ 1.4	$ 2.0		4.3
Other Income \| Insurance Claim Arising In 2014 \| Kronos Worldwide, Inc.
Disclosure Other Income Net Additional Information Detail [Line Items]
Income received from settlement of business interruption insurance claim					3.4
Other Income \| Insurance Claim Arising In 2015 \| Kronos Worldwide, Inc.
Disclosure Other Income Net Additional Information Detail [Line Items]
Income received from settlement of business interruption insurance claim	$ 0.9
Amalgamated Sugar Company LLC
Disclosure Other Income Net Additional Information Detail [Line Items]
Dividends and interest income				$ 25.4	$ 25.4	$ 25.4