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Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance		$ 1,479.2	[1]	$ 1,439.1
Decreases for positions taken in prior years		(31.9)		(71.4)
Increases for positions taken in prior years		26.1		38.5
Increases for positions related to the current year		60.7		89.6
Settlements with taxing authorities		(16.8)		(3.9)
Lapsing of statutes of limitations		(12.4)		(12.7)
Unrecognized tax benefits	[1]	$ 1,504.9		$ 1,479.2
[1] Of this amount, $1,157.5 million and $1,137.8 million are included in Long-term income taxes for 2021 and 2020, respectively, and $332.0 million and $325.0 million are included in Prepaid expenses and other current assets for 2021 and 2020, respectively, on the Consolidated Balance Sheet. The remainder is included in Deferred income taxes on the Consolidated Balance Sheet.

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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
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-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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

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