Acquisitions and Dispositions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) franchise dealership
Acquisitions and Dispositions (Textual) [Abstract]
Net gain on dispositions | $	$ 5.4
U.S.
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships opened | dealership	1
Number of franchises opened	1
Number of dealerships disposed	3
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	3
Number of franchises disposed	4
Brazil
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships disposed	1
Number of franchises disposed	1