EMPLOYEE STOCK BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 6.5	$ 8.0	$ 15.5	$ 15.3
Net tax benefit related to stock-based compensation expense	(2.1)	(2.7)	(5.2)	(5.3)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	2.0	1.8	3.9	3.5
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.1	3.6	5.5	6.8
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 3.4	$ 2.6	$ 6.1	$ 5.0