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Goodwill and Franchise Value - Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2008
Goodwill [Roll Forward]
Balance		$ 256.3	$ 259.4
Adjustments to purchase price allocations	$ (2.2)		(2.2)
Additions through acquisitions		180.7
Reductions through divestitures		(2.1)	(0.9)
Balance		434.9	256.3
Accumulated impairment losses				$ 299.3
Domestic
Goodwill [Roll Forward]
Balance		114.0	114.8
Adjustments to purchase price allocations			(0.8)
Additions through acquisitions		51.4
Reductions through divestitures		(0.9)	0.0
Balance		164.5	114.0
Import
Goodwill [Roll Forward]
Balance		104.3	106.2
Adjustments to purchase price allocations			(1.0)
Additions through acquisitions		85.8
Reductions through divestitures		(1.2)	(0.9)
Balance		188.9	104.3
Luxury
Goodwill [Roll Forward]
Balance		38.0	38.4
Adjustments to purchase price allocations			(0.4)
Additions through acquisitions		43.5
Reductions through divestitures		0.0	0.0
Balance		$ 81.5	$ 38.0

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- Definition

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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