Summary of Significant Accounting Policies - Schedule of Goodwill, Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill	$ 1,225.8	$ 1,260.1	$ 1,297.1
Finite-lived:
Gross	494.9	481.4
Accumulated Amortization	425.4	389.4
Net	69.5	92.0
Indefinite-lived:
Gross	179.1	176.6
Total intangible assets
Gross	674.0	658.0
Accumulated Amortization	425.4	389.4
Net	248.6	268.6
Tradenames
Indefinite-lived:
Gross	52.0	52.0
Reacquired franchise rights
Indefinite-lived:
Gross	127.1	124.6
Customer relationships
Finite-lived:
Gross	473.0	460.5
Accumulated Amortization	403.8	375.7
Net	69.2	84.8
Other
Finite-lived:
Gross	21.9	20.9
Accumulated Amortization	21.6	13.7
Net	$ 0.3	$ 7.2