Franchising Operating Rights and Goodwill - Roll forward (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Franchise Operating Rights
Balance at beginning of period		$ 278.3	$ 585.1
Impairment charge	$ (128.1)		(128.1)
Balance at end of period	457.0	278.3	457.0
Goodwill
Balance at beginning of period		225.1	225.1
Impairment charge	0.0		0.0
Balance at end of period	225.1	225.1	225.1
Franchise operating rights and goodwill
Balance at beginning of the period		503.4	810.2
Impairment			(128.1)
Balance at end of the period	$ 682.1	$ 503.4	$ 682.1