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EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 9.6	$ 9.0
Net tax benefit related to stock-based compensation expense	(3.8)	(3.1)
Stock Options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.8	1.4
Performance Share Awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	5.4	5.1
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.4	$ 2.5

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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