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Stock-Based Compensation (Compensation Cost And Related Tax Benefits) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stock-Based Compensation [Abstract]
Stock-based compensation expense	$ 3.5	$ 3.1	$ 9.5	$ 8.6
Tax benefit	(1.2)	(1.1)	(3.3)	(3.0)
Stock-based compensation expense, net of taxes	$ 2.3	$ 2.0	$ 6.2	$ 5.6

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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