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Summary of Significant Accounting Policies Activity in Goodwill by Segment (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Goodwill [Line Items]
Beginning balance	$ 2,773.1
Net restaurant purchases (sales)	64.8
Currency translation	(55.4)
Ending balance	2,782.5
U.S.
Goodwill [Line Items]
Beginning balance	1,625.5
Net restaurant purchases (sales)	47.9
Currency translation	0.0
Ending balance	1,673.4
International Operated Markets
Goodwill [Line Items]
Beginning balance	1,147.6
Net restaurant purchases (sales)	16.9
Currency translation	(55.4)
Ending balance	1,109.1
International Developmental Licensed Markets & Corporate
Goodwill [Line Items]
Beginning balance	0.0
Net restaurant purchases (sales)	0.0
Currency translation	0.0
Ending balance	$ 0.0

X

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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