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Summary of Significant Accounting Policies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Summary of Significant Accounting Policies (Textual) [Abstract]
Component of lease exit expense in interest expense, other, net			$ 0.3
Component of lease exit expense in selling, general and administrative expenses			0.4
Component of lease exit expense in income (loss) from operations and the sale of dealerships			3.6
Component of lease exit payments in selling, general and administrative expenses			1.0
Component of lease exit payments in income (loss) from operations and the sale of dealerships			5.6
Effective tax rate from continuing operations	40.00%	38.40%	34.60%	39.60%
Effective tax benefit from continuing operations, amount					$ 3.6

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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