Intangibles - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) dealership
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge		$ 10.7
Brazil
Finite-Lived Intangible Assets [Line Items]
Number Of Dealerships Impaired | dealership		1
Goodwill impairment charge		$ 10.7
U.K.
Finite-Lived Intangible Assets [Line Items]
Number Of Dealerships Impaired | dealership		6
Goodwill impairment charge		$ 0.0
U.S.
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge		$ 0.0
Franchise rights | Brazil
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible asset	$ 0.1
Franchise rights | U.K.
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible asset	11.1
Brazil
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 10.7