EMPLOYEE STOCK BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 4.1	$ 7.5	$ 19.6	$ 22.8
Net tax benefit related to stock-based compensation expense	(1.3)	(2.5)	(6.5)	(7.8)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.8	1.8	5.7	5.3
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	(1.1)	2.9	4.4	9.7
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 3.4	$ 2.8	$ 9.5	$ 7.8