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Detail of Rent Expense (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases Disclosure [Line Items]      
Document Fiscal Year Focus 2017    
Rent Expense $ 1,644.5 $ 1,814.2 $ 1,839.0
Company-operated restaurants:      
Leases Disclosure [Line Items]      
Rents in excess of minimum rents 115.6 135.0 146.6
Rent Expense 464.6 661.9 711.9
Franchised restaurants:      
Leases Disclosure [Line Items]      
Rents in excess of minimum rents 204.9 186.4 178.8
Rent Expense 1,097.9 1,061.0 1,028.7
Other      
Leases Disclosure [Line Items]      
Rent Expense 82.0 91.3 98.4
U.S. | Company-operated restaurants:      
Leases Disclosure [Line Items]      
Rent Expense 37.4 48.6 59.2
U.S. | Franchised restaurants:      
Leases Disclosure [Line Items]      
Rent Expense 488.6 471.2 463.7
Outside the U.S. | Company-operated restaurants:      
Leases Disclosure [Line Items]      
Rent Expense 427.2 613.3 652.7
Outside the U.S. | Franchised restaurants:      
Leases Disclosure [Line Items]      
Rent Expense $ 609.3 $ 589.8 $ 565.0