STOCK-BASED COMPENSATION (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Performance Stock Rights
Weighted-average fair values per stock option along with the assumptions incorporated into the valuation models
Risk-free interest rate, minimum (as a percent)	0.17%
Risk-free interest rate, maximum (as a percent)	1.27%
Expected volatility, minimum (as a percent)	19.00%
Expected volatility, maximum (as a percent)	36.00%
Weighted-Average Grant Date Fair Value
Granted (in dollars per share)	$ 48.50	$ 52.70
Additional disclosures
Compensation cost not yet recognized	$ 5.9
Period over which compensation cost is to be recognized	1 year 6 months
Tax benefit realized from the distribution of shares	3.6	1.9
Total intrinsic value
Total intrinsic value of performance shares distributed during the period	8.8	4.7
Performance Stock Rights | Minimum
Weighted-average fair values per stock option along with the assumptions incorporated into the valuation models
Expected dividend yield (as a percent)	5.18%
Period of historical volatility used to estimate expected volatility	2 years
Performance Stock Rights | Maximum
Weighted-average fair values per stock option along with the assumptions incorporated into the valuation models
Expected dividend yield (as a percent)	5.34%
Period of historical volatility used to estimate expected volatility	3 years
Performance Stock Rights accounted for as Equity awards
Performance Stock Rights and Restricted Shares Units Activity
Outstanding at the beginning of the period (in shares)	108,314
Granted (in shares)	22,636
Distributed (in shares)	(94,758)
Adjustment for final payout (in shares)	21,867
Outstanding at the end of period (in shares)	58,059
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 65.38
Granted (in dollars per share)	$ 48.50
Distributed (in dollars per share)	$ 72.36
Adjustment for final payout (in dollars per shares)	$ 72.36
Outstanding at the end of the period (in dollars per share)	$ 50.04
Performance Stock Rights accounted as Liability awards
Performance Stock Rights and Restricted Shares Units Activity
Outstanding at the beginning of the period (in shares)	189,093
Granted (in shares)	90,496
Distributed (in shares)	(61,753)
Adjustment for final payout (in shares)	14,255
Outstanding at the end of period (in shares)	232,091
Weighted-Average Grant Date Fair Value
Outstanding at the end of the period (in dollars per share)	$ 48.06
Restricted Share Unit Awards
Performance Stock Rights and Restricted Shares Units Activity
Outstanding at the beginning of the period (in shares)	505,690
Granted (in shares)	189,094
Dividend equivalents (in shares)	5,818
Vested and released (in shares)	(204,072)
Forfeited (in shares)	(1,507)
Outstanding at the end of period (in shares)	495,023
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 48.38
Granted (in dollars per share)	$ 56.00	$ 53.24
Dividend equivalents (in dollars per share)	$ 52.20
Vested and released (in dollars per share)	$ 46.28
Forfeited (in dollars per share)	$ 48.47
Outstanding at the end of the period (in dollars per share)	$ 52.20
Additional disclosures
Compensation cost not yet recognized	17.4
Period over which compensation cost is to be recognized	2 years 6 months
Tax benefit realized from the distribution of shares	4.6	4.2
Total intrinsic value
Total intrinsic value of awards vested and released	$ 11.4	$ 10.4
Nonemployee director deferred stock units
Additional disclosures
Vesting period	1 year