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SEGMENT INFORMATION - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($) segment
Segment Reporting Information
Number of reportable segments | segment			3	3
Asset impairments	$ 0.0	$ 23.8	$ 0.0	$ 23.8
Loss on extinguishment of debt	0.0	10.4	0.0	10.4
U.S.
Segment Reporting Information
Net pre-tax gain (loss) on dealership dispositions			1.8
Asset impairments			2.2
Gain (loss) on legal matters			1.0
Share-based Payment Arrangement, Expense		10.6		10.6
Loss on extinguishment of debt		10.4		10.4
U.S. | Interest Rate Swaps
Segment Reporting Information
Loss of derivative instruments	2.3		2.3
U.S. | Dealership
Segment Reporting Information
Net pre-tax gain (loss) on dealership dispositions	$ 0.8		1.7
U.K.
Segment Reporting Information
Net pre-tax gain (loss) on dealership dispositions			$ (0.6)
Asset impairments		12.8		12.8
Severance expense		1.2		1.2
Brazil
Segment Reporting Information
Asset impairments		$ 11.1		11.1
Severance expense				$ 0.9

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