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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 stores	Dec. 31, 2012 stores	Dec. 31, 2011 stores
Business Combinations [Abstract]
Number of stores purchased	5	6	1
Amounts incurred related to acquisitions	$ 95.7	$ 203.7	$ 64.2

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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