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Stock-Based Compensation (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
Stock-Based Compensation (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stock-Based Compensation expense
Net stock-based compensation expense	$ 3.5	$ 4.1	$ 12.6	$ 11.8

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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