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Summary of Significant Accounting Policies Activity in Goodwill by Segment (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Goodwill [Line Items]  
Beginning balance $ 2,677.4
Business Acquisition, Goodwill, Expected Tax Deductible Amount 9.8
Net restaurant purchases (sales) 9.7
Impairment losses 0.0
Currency translation 76.2
Ending balance 2,773.1
U.S.  
Goodwill [Line Items]  
Beginning balance 1,615.8
Business Acquisition, Goodwill, Expected Tax Deductible Amount 9.8
Net restaurant purchases (sales) (0.1)
Impairment losses 0.0
Currency translation 0.0
Ending balance 1,625.5
International Operated Markets [Member]  
Goodwill [Line Items]  
Beginning balance 1,061.6
Business Acquisition, Goodwill, Expected Tax Deductible Amount 0.0
Net restaurant purchases (sales) 9.8
Impairment losses 0.0
Currency translation 76.2
Ending balance 1,147.6
International Developmental Licensed Markets and Corporate [Member]  
Goodwill [Line Items]  
Beginning balance 0.0
Business Acquisition, Goodwill, Expected Tax Deductible Amount 0.0
Net restaurant purchases (sales) 0.0
Impairment losses 0.0
Currency translation 0.0
Ending balance $ 0.0