INCOME TAXES (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred income tax assets:
F&I chargeback liabilities	$ 11.8	$ 11.0
Other accrued liabilities	2.1	3.2
Stock-based compensation	2.2	2.4
Operating lease right-of-use assets	18.7	0.0
Other, net	9.0	3.9
Total deferred income tax assets	43.8	20.5
Deferred income tax liabilities:
Intangible asset amortization	(16.4)	(12.5)
Depreciation	(33.4)	(26.4)
Operating lease liabilities	(17.7)	0.0
Other, net	(2.3)	(3.3)
Total deferred income tax liabilities	(69.8)	(42.2)
Net deferred income tax (liabilities) assets	$ (26.0)	$ (21.7)