EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 8.0	$ 9.8	$ 15.3	$ 18.4
Net tax benefit related to stock-based compensation expense	(2.7)	(3.3)	(5.3)	(6.2)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.8	1.6	3.5	3.3
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	3.6	5.2	6.8	9.4
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.6	$ 3.0	$ 5.0	$ 5.7