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EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Stock-based compensation expense
Pre-tax stock-based compensation expense	$ 10.4	$ 4.5	$ 30.9	$ 14.1
Net tax benefit related to stock-based compensation expense	(3.6)	(1.8)	(10.7)	(4.0)
Stock options
Stock-based compensation expense
Pre-tax stock-based compensation expense	1.6	0.9	4.4	2.9
Performance share awards
Stock-based compensation expense
Pre-tax stock-based compensation expense	6.0	1.2	18.2	3.8
Restricted stock units
Stock-based compensation expense
Pre-tax stock-based compensation expense	$ 2.8	$ 2.4	$ 8.3	$ 7.4

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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