Other Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 211.7	$ 211.7
Accumulated Amortization	(144.5)	(133.7)
Net	67.2	78.0
Franchising Rights
Finite-Lived Intangible Assets [Line Items]
Gross	200.0	200.0
Accumulated Amortization	(141.0)	(131.0)
Net	59.0	69.0	$ 79.0	$ 89.0
Reacquired Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Gross	8.3	8.3
Accumulated Amortization	(3.2)	(2.6)
Net	5.1	5.7	9.8	11.5
Favorable leaseholds
Finite-Lived Intangible Assets [Line Items]
Gross	3.4	3.4
Accumulated Amortization	(0.3)	(0.2)
Net	$ 3.1	$ 3.2	$ 4.1	$ 3.6