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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Accounting Policies [Line Items]                      
Document Period End Date                 Dec. 31, 2018    
Derivative Liability, Fair Value, Gross Liability $ (16.6)       $ (45.4)       $ (16.6) $ (45.4)  
Advertising costs of Company-operated restaurants                 388.8 532.9 $ 645.8
Other marketing-related expenses                 88.0 100.2 88.8
Unrecognized compensation cost related to nonvested share-based compensation that is expected to be recognized 114.3               $ 114.3    
Weighted-average expected recognition period for unrecognized share-based compensation costs                 2 years 1 month 6 days    
Long lived assets impairment test period                 12 months    
GoodiwillWrittenOffRelatedToSaleOfCompanyRestaurantMonthsFromAcquisition                 24 months    
Fair Value Goodwill Written Off Related To Sale Of Restaurant Minimum Months Company Operated                 24 months    
Goodwill, Impaired, Accumulated Impairment Loss 15.6       14.5       $ 15.6 14.5  
Debt obligations, carrying amount 31,100.0               31,100.0    
Net increase (decrease) after-tax related to the cash flow hedges component of accumulate OCI in shareholders' equity                 48.9 $ (39.4) $ 2.9
Cumulative deferred hedging losses, after tax, included in accumulated other comprehensive income (32.4)               $ (32.4)    
Dilutive effect of share-based compensation                 7.3 8.1 6.8
Stock options that were not included in diluted weighted-average shares                 0.5 0.1 1.2
Revenues from franchised restaurants 2,791.8 $ 2,858.4 $ 2,759.0 $ 2,603.3 2,667.1 $ 2,690.3 $ 2,480.1 $ 2,264.0 $ 11,012.5 $ 10,101.5 $ 9,326.9
Level 2                      
Significant Accounting Policies [Line Items]                      
Debt obligations, fair value 31,700.0               31,700.0    
Interest Rate Swap [Member]                      
Significant Accounting Policies [Line Items]                      
Derivative, Notional Amount 738.0               $ 738.0    
Building [Member]                      
Significant Accounting Policies [Line Items]                      
Property and equipment, estimated useful life maximum                 40 years    
Leasehold Improvements [Member]                      
Significant Accounting Policies [Line Items]                      
Property and equipment, estimated useful life                 the lesser of useful lives of assets or lease terms    
Minimum | Equipment [Member]                      
Significant Accounting Policies [Line Items]                      
Property and equipment, estimated useful life maximum                 3 years    
Maximum | Equipment [Member]                      
Significant Accounting Policies [Line Items]                      
Property and equipment, estimated useful life maximum                 12 years    
Intercompany Debt [Member]                      
Significant Accounting Policies [Line Items]                      
Notional Amount of Nonderivative Instruments                 $ 3,500.0    
Debt [Member]                      
Significant Accounting Policies [Line Items]                      
Notional Amount of Nonderivative Instruments                 $ 10,800.0    
Royalty Arrangement                      
Significant Accounting Policies [Line Items]                      
Period covered by hedge                 18 months    
Derivative, Notional Amount 726.3               $ 726.3    
Not Designated as Hedging Instrument [Member]                      
Significant Accounting Policies [Line Items]                      
Derivative Liability, Fair Value, Gross Liability (2.7)       (6.8)       (2.7) (6.8)  
Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member] | Foreign currency                      
Significant Accounting Policies [Line Items]                      
Derivative Liability, Fair Value, Gross Liability 0.0       (5.5)       0.0 (5.5)  
Accrued payroll and other liabilities | Not Designated as Hedging Instrument [Member] | Equity                      
Significant Accounting Policies [Line Items]                      
Derivative Liability, Fair Value, Gross Liability $ (2.7)       $ (1.3)       $ (2.7) $ (1.3)