Acquisitions and Dispositions (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019 franchise dealership	Dec. 31, 2019 USD ($) franchise dealership
Acquisitions and Dispositions (Textual) [Abstract]
Net gain on dispositions | $		$ 5.2
U.S.
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships opened | dealership	1	3
Number of franchises opened	1
Number of franchises disposed		6
U.K.
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships opened | dealership	1
Number of franchises opened	1
Number of dealerships disposed		1
Number of franchises disposed		1