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EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 8.6	$ 9.6
Net tax benefit related to stock-based compensation expense	(2.9)	(3.8)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.7	1.8
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	4.2	5.4
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.7	$ 2.4

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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