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Employee Stock Benefit Plans (Schedule Of Stock-Based Compensation Expense) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Employee Stock Benefit Plans
Stock options	$ 1.4	$ 0.8	$ 2.8	$ 2.0
Performance share awards	7.1	1.3	12.2	2.6
Restricted stock units	3.0	2.4	5.5	5.0
Total pre-tax stock-based compensation expense	11.5	4.5	20.5	9.6
Net tax benefit related to stock-based compensation expense	$ (4.0)	$ (1.8)	$ (7.1)	$ (2.2)

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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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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