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Acquisitions And Other Investments (Spider Purchase Price Allocation) (Details) (USD $) In Millions	Dec. 31, 2010	Jul. 06, 2010
Total consideration transferred including interest held prior to acquisition	$ (1.7)
Spider [Member]
Total consideration transferred including interest held prior to acquisition		56.9
Fair value of equity interest before acquisition		51.9
Goodwill	$ 75.2

This element represents the sum of the: (1) acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer and (2) the acquisition-date fair value of any equity interest in the acquiree held by the acquirer prior to the business combination (for example, a step acquisition).

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