XML 21 R50.htm IDEA: XBRL DOCUMENT

Stock-Based Compensation (Compensation Cost and Related Tax Benefits) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock-based Compensation
Stock-based compensation expense	$ 2.6	$ 2.7	$ 6.0	$ 5.5
Tax benefit	(0.9)	(0.9)	(2.1)	(1.9)
Stock-based compensation expense, net of taxes	$ 1.7	$ 1.8	$ 3.9	$ 3.6

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.

+ References+ Details