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Cost of Revenue (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cost of Revenue (Textual) [Abstract]
Corporate office costs	$ 47.6	$ 41.7
Stock-based compensation expense	$ 10.5	$ 9.9

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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