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Goodwill and Franchise Value - Schedule of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2008
Goodwill [Roll Forward]
Beginning balance	$ 977.3
Additions through acquisitions	45.7	$ 395.5
Reductions through divestitures	(3.7)	(11.2)
Ending balance	1,019.3	593.0
Accumulated impairment loss			$ 299.3
Domestic
Goodwill [Roll Forward]
Beginning balance	304.0
Additions through acquisitions	11.2	101.0
Reductions through divestitures	(3.7)	(1.5)
Ending balance	311.5	204.5
Import
Goodwill [Roll Forward]
Beginning balance	468.2
Additions through acquisitions	21.2	188.7
Reductions through divestitures	0.0	(8.4)
Ending balance	489.4	287.9
Luxury
Goodwill [Roll Forward]
Beginning balance	205.1
Additions through acquisitions	13.3	105.8
Reductions through divestitures	0.0	(1.3)
Ending balance	$ 218.4	$ 100.6

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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