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Share-Based Compensation (Narrative) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation [Abstract]
Share-based compensation expense	$ 1.3	$ 1.2	$ 4.0	$ 3.8
Share-based compensation expense, net of tax	$ 0.8	$ 0.8	$ 2.6	$ 2.5

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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