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Business Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Business Acquisition [Line Items]
Intangible assets	$ 10.9
Goodwill	19.3
Total cash consideration	$ 37.5
Finite-Lived Intangible Assets, Useful Life	20 years

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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