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Share-Based Compensation (Narrative) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-Based Compensation
Share-based compensation expense	$ 1.3	$ 1.3	$ 2.7	$ 2.6
Share-based compensation expense, net of tax	$ 0.9	$ 0.9	$ 1.8	$ 1.7

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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