STOCK-BASED COMPENSATION - STOCK OPTIONS (Details) (Stock Options, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Weighted-average fair values along with the assumptions incorporated into the valuation models
Weighted-average fair value per stock option (in dollars per share)	$ 6.70	$ 6.03	$ 6.30
Expected term	8 years	5 years	5 years
Risk-free interest rate, minimum (as a percent)	0.12%	0.18%	0.17%
Risk-free interest rate, maximum (as a percent)	2.88%	2.11%	2.18%
Expected dividend yield (as a percent)	5.28%	5.33%	5.28%
Expected volatility (as a percent)	18.00%	24.00%	25.00%
Stock Options
Outstanding, at the beginning of the period (in shares)	1,550,374
Granted, (in shares)	264,332
Exercised (in shares)	(1,676,831)
Forfeited (in shares)	(3,858)
Outstanding, at the end of the period (in shares)	134,017	1,550,374
Exercisable at the end of the period (in shares)	59,714
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 50.93
Granted (in dollars per share)	$ 55.23
Exercised (in dollars per share)	$ 51.33
Forfeited (in dollars per share)	$ 55.23
Outstanding at the end of the period (in dollars per share)	$ 54.31	$ 50.93
Exercisable at the end of the period (in dollars per share)	$ 55.21
Weighted-Average Remaining Contractual Life (in Years)
Outstanding at the end of the period	6 years 7 months
Exercisable at the end of period	5 years 7 months
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	$ 3.2
Exercisable at the end of the period (in dollars)	1.4
Options exercised (in dollars)	32.0	9.0	11.0
Additional disclosures
Tax benefit realized for the tax deductions from option exercises	$ 12.8	$ 3.6	$ 4.4