Franchising Operating Rights and Goodwill - Roll forward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Franchise Operating Rights
Balance at beginning of period	$ 457.0	$ 620.1	$ 585.1	$ 620.1
Impairment charge	(131.7)		(259.8)
Balance at end of period	325.3	620.1	325.3	620.1
Goodwill
Balance at beginning of period	225.1	225.1	225.1	225.1
Impairment charge	0.0		0.0
Balance at end of period	$ 225.1	$ 225.1	$ 225.1	$ 225.1