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Summary of Significant Accounting Policies Activity in Goodwill by Segment (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Goodwill [Line Items]  
Beginning balance $ 2,379.7
Net restaurant purchases (sales) 21.1
Impairment losses (1.1)
Currency translation (68.2)
Ending balance 2,331.5
U.S.  
Goodwill [Line Items]  
Beginning balance 1,274.0
Net restaurant purchases (sales) 2.5
Impairment losses 0.0
Ending balance 1,276.5
International Lead Markets [Member]  
Goodwill [Line Items]  
Beginning balance 750.5
Net restaurant purchases (sales) 20.2
Impairment losses 0.0
Currency translation (52.4)
Ending balance 718.3
High-Growth Markets [Member]  
Goodwill [Line Items]  
Beginning balance 316.7
Net restaurant purchases (sales) (1.3)
Impairment losses 0.0
Currency translation (14.1)
Ending balance 301.3
Foundational Markets and Corporate [Member]  
Goodwill [Line Items]  
Beginning balance 38.5
Net restaurant purchases (sales) (0.3)
Impairment losses (1.1)
Currency translation (1.7)
Ending balance $ 35.4