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Stock-Based Compensation (Compensation Cost And Related Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock-Based Compensation [Abstract]
Stock-based compensation expense	$ 4.1	$ 3.4
Tax benefit	(1.4)	(1.2)
Stock-based compensation expense, net of taxes	$ 2.7	$ 2.2

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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