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Income Taxes Significant Differences Between U.S. Federal Statutory Rate and Effective Income Tax Rate Footnote (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Effective Tax Rates Line Items
Foreign income tax rate differential	8.40%	3.70%	0.30%
Income tax expense related to transition tax on foreign earnings	$ 42.3
Jordan Bromine Company Limited
Schedule Of Effective Tax Rates Line Items
Foreign income tax rate differential	11.90%	8.00%	3.30%
Change in valuation allowance, change in expected profitability
Schedule Of Effective Tax Rates Line Items
Change in valuation allowance	$ 2.1	$ 1.5
Change in valuation allowance, foreign restructuring plan
Schedule Of Effective Tax Rates Line Items
Change in valuation allowance	$ 8.2

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Schedule Of Effective Tax Rates Line Items

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Tax Cuts And Jobs Act of 2017, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense (Benefit)

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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