STOCK-BASED COMPENSATION (Details 2) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Options
Stock based compensation
Period of historical volatility used to estimate expected volatility	10 years
Weighted-average fair values per stock option along with the assumptions incorporated into the valuation models
Weighted-average fair value per option (in dollars per share)	$ 6.03
Expected term	5 years
Risk-free interest rate, (as a percent)	0.18%
Risk-free interest rate, (as a percent)	2.11%
Expected dividend yield (as a percent)	5.33%
Expected volatility (as a percent)	24.00%
Stock Options
Outstanding, at the beginning of the period (in shares)	2,046,355
Granted (in shares)	319,234
Exercised (in shares)	(145,955)
Outstanding at the end of the period (in shares)	2,219,634
Exercisable at the end of the period (in shares)	1,463,836
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 49.25
Granted (in dollars per share)	$ 56.00
Exercised (in dollars per share)	$ 44.03
Outstanding at the end of the period (in dollars per share)	$ 50.56
Exercisable at the end of the period (in dollars per share)	$ 49.78
Weighted-Average Remaining Contractual Life (in Years)
Outstanding at the beginning of the period	6 years 4 days
Exercisable at the end of the period	4 years 6 months 22 days
Outstanding at the end of the period	6 years 4 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 16.9
Exercisable at the end of the period (in dollars)	12.4
Additional disclosures
Compensation cost not yet recognized	2.6
Period over which compensation cost is to be recognized	2 years
Intrinsic value of options exercised	$ 1.9	$ 2.0