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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	20.20%	27.20%	17.80%	25.30%
Income tax reconciliation nondeductible expense executive compensation		$ 5.0		$ 5.0
Effective tax rate increased related to limitations on deduction of executive compensation		9.80%		7.50%
Gross unrecognized tax benefits excluding interest and penalties	$ 45.0		$ 45.0		$ 43.5
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate	36.9		36.9
Accrued interest on unrecognized tax benefits	$ 0.6		0.6		$ 0.5
Net unrecognized tax benefits, excluding interest and penalties, related to foreign tax positions			$ 0.6

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- Definition

Effective income tax rate increased related to limitations on deduction of executive compensation.

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Represents income tax reconciliation nondeductible expense executive compensation.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-Section 50
-Paragraph 15A
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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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-Name Accounting Standards Codification
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