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Stock Based Compensation (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
Stock Based Compensation (Details) (USD $) In Millions	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock Based Compensation (Textuals) [Abstract]
Stock based compensation expense	$ 2.4	$ 3.1	$ 5.1	$ 6.0

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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