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Stock-Based Compensation (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Net stock-based compensation expense	$ 3.8	$ 4.9
Stock Based Compensation (Textual) [Abstract]
Benefit in Loss from discontinued operations for shares	0.5
Selling General And Administrative Expense [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Net stock-based compensation expense	$ 4.3

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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