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Stock-Based Compensation Plans (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Allocation of recognized period costs of employee service share-based compensation
Stock based compensation expense, gross	$ 9.8	$ 8.7	$ 18.9	$ 16.2
Stock based compensation expense, net of tax	6.7	5.9	12.9	11.0
Tax benefit on stock based compensation	3.1	2.8	6.0	5.2
Cost of revenue
Allocation of recognized period costs of employee service share-based compensation
Stock based compensation expense, gross	4.9	4.5	9.6	8.2
Selling, general and administrative expenses
Allocation of recognized period costs of employee service share-based compensation
Stock based compensation expense, gross	$ 4.9	$ 4.2	$ 9.3	$ 8.0

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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