Income Taxes - Tabular Reconciliation of Total Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Balance at January 1	$ 241.4	$ 391.9	$ 521.0
Increases related to business combinations	0.6
Increases related to prior periods	1.4	80.9	68.7
Decreases related to prior periods	(0.3)	(136.8)	(206.2)
Increases related to current period	4.8	4.3	8.7
Decreases related to settlements with taxing authorities		(98.4)
Decreases related to lapse of statute of limitations	(0.5)	(0.5)	(0.3)
Balance at December 31	247.4	241.4	391.9
Amounts impacting effective tax rate, if recognized balance at December 31	$ 213.2	$ 204.1	$ 251.6

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 217
-Publisher FASB
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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 acquisitions.

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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 increase 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 lapses of applicable statutes of limitations.

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

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