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Income Taxes - Gross Unrecognized Tax Benefit (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits at January	$ 13.4	$ 11.7
Increases in tax positions for current year	14.6	3.8
Settlements	(2.9)	(1.7)
Lapse in statute of limitations	(3.4)	(1.4)
Increases in tax positions for prior years	3.6	3.1
Decreases in tax positions for prior years	0.0	(2.1)
Gross unrecognized tax benefits at December	$ 25.3	$ 13.4

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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