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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 stores	Dec. 31, 2011 stores	Dec. 31, 2010 stores
Business Acquisition [Line Items]
Number of stores purchased	6	1	5
Aggregate purchase price	$ 203.7	$ 64.2	$ 73.1
Goodwill	65.2
Reporting Unit, Domestic [Member]
Business Acquisition [Line Items]
Goodwill	8.8
Reporting Unit, Import [Member]
Business Acquisition [Line Items]
Goodwill	15.8
Reporting Unit, Premium Luxury [Member]
Business Acquisition [Line Items]
Goodwill	$ 40.6

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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