EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 7.3	$ 5.9	$ 25.7	$ 23.8
Net tax benefit related to stock-based compensation expense	(2.6)	(2.5)	(8.8)	(9.1)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.6	1.8	4.9	5.5
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	3.5	2.0	12.9	11.8
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.2	$ 2.1	$ 7.9	$ 6.5