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Activity in Goodwill by Segment (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Goodwill [Line Items]  
Beginning balance $ 2,336.5
Net restaurant purchases (sales) (64.3)
Currency translation 107.5
Ending balance 2,379.7
U.S.  
Goodwill [Line Items]  
Beginning balance 1,283.3
Net restaurant purchases (sales) (9.3)
Ending balance 1,274.0
International Lead Markets [Member]  
Goodwill [Line Items]  
Beginning balance 681.2
Net restaurant purchases (sales) 2.5
Currency translation 66.8
Ending balance 750.5
High-Growth Markets [Member]  
Goodwill [Line Items]  
Beginning balance 280.1
Net restaurant purchases (sales) 0.7
Currency translation 35.9
Ending balance 316.7
Foundational Markets and Corporate [Member]  
Goodwill [Line Items]  
Beginning balance 91.9
Net restaurant purchases (sales) (58.2)
Currency translation 4.8
Ending balance $ 38.5