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Acquisitions and Divestitures - Dynamic Acquisition - Unaudited Pro Forma Results of Operations (Parenthetical) (Details) (Dynamic Acquisition, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Dynamic Acquisition
Business Acquisition [Line Items]
Business combination, acquisition related costs, pro forma adjustment	$ 2.5
Fees to secure financing for acquisition, pro forma adjustment	$ 10.9

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- Definition

Business Combination, Acquisition Related Costs, Pro Forma Adjustment

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- Definition

Fees To Secure Financing For Acquisition, Pro Forma Adjustment

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