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Equity Method Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 0.0		$ 0.0		$ 0.0
Joint-venture interest	50.00%		50.00%
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		$ 11.6		$ 11.6
Carrols Restaurant Group, Inc.
Schedule of Equity Method Investments [Line Items]
Quoted market price	$ 115.3		$ 115.3
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Accounts receivable from equity method investments	$ 23.0		$ 23.0		25.7
Canada \| TIMWEN Partnership
Schedule of Equity Method Investments [Line Items]
Joint-venture interest	50.00%		50.00%
Tim Hortons \| Wendy's Company TIMWEN Partnership
Schedule of Equity Method Investments [Line Items]
Cash distributions	$ 3.0	3.1	$ 5.4	5.6
Contingent rent expense	4.9	$ 5.2	9.4	$ 9.6
Other assets
Schedule of Equity Method Investments [Line Items]
Investment in subsidiaries	$ 152.7		$ 152.7		$ 151.1