EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 7.5	$ 7.3	$ 22.8	$ 25.7
Net tax benefit related to stock-based compensation expense	(2.5)	(2.6)	(7.8)	(8.8)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.8	1.6	5.3	4.9
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	2.9	3.5	9.7	12.9
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.8	$ 2.2	$ 7.8	$ 7.9