INCOME TAXES (Schedule of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred income tax assets:
F&I chargeback liabilities	$ 16.5	$ 14.8
Other accrued liabilities	4.7	4.4
Stock-based compensation	5.2	4.5
Intangible asset amortization	0.0	0.3
Other, net	8.4	9.2
Total deferred income tax assets	34.8	33.2
Deferred income tax liabilities:
Intangible asset amortization	(7.3)	0.0
Depreciation	(34.9)	(33.4)
Other, net	(1.5)	(1.7)
Total deferred income tax liabilities	(43.7)	(35.1)
Net deferred income tax (liabilities) assets	$ (8.9)	$ (1.9)