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Revenues from Franchised Restaurants (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Franchisor Disclosure [Line Items]      
Rents $ 6,844.7 $ 7,500.2 $ 7,082.2
Royalties 3,831.5 4,107.1 3,886.3
Initial Fees 49.9 48.4 44.0
Revenues from franchised restaurants $ 10,726.1 $ 11,655.7 $ 11,012.5