Other Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Gross	$ 215.8	$ 215.3
Accumulated Amortization	(122.9)	(111.1)
Net	92.9	104.2	$ 2.4
Franchising rights
Finite-Lived Intangible Assets [Line Items]
Gross	200.0	200.0
Accumulated Amortization	(121.0)	(111.0)
Net	79.0	89.0
Reacquired Franchise Rights
Finite-Lived Intangible Assets [Line Items]
Gross	11.6	11.6
Accumulated Amortization	(1.8)	(0.1)
Net	9.8	11.5
Leaseholds
Finite-Lived Intangible Assets [Line Items]
Gross	4.2	3.7
Accumulated Amortization	(0.1)	(0.0)
Net	$ 4.1	$ 3.7