EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 7.3	$ 8.6
Net tax benefit related to stock-based compensation expense	(2.6)	(2.9)
Stock options
Stock-based compensation expense
Total pre-tax stock-based compensation expense	1.7	1.7
Performance share awards
Stock-based compensation expense
Total pre-tax stock-based compensation expense	3.2	4.2
Restricted stock units
Stock-based compensation expense
Total pre-tax stock-based compensation expense	$ 2.4	$ 2.7