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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]
Employee stock-based compensation expense	$ 8.4	$ 5.8	$ 14.2	$ 10.7

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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