STOCK-BASED COMPENSATION (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Restricted Share Units
Performance Stock Rights and Restricted Stock Units Activity
Outstanding at the beginning of the period (in shares)	505,690
Granted (in shares)	196,894
Dividend equivalents (in shares)	17,830
Vested and released (in shares)	(207,411)
Forfeited (in shares)	(5,997)
Outstanding at the end of period (in shares)	507,006
Weighted-Average Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 48.38
Granted (in dollars per share)	$ 55.93	$ 53.24
Dividend equivalents (in dollars per share)	$ 52.19
Vested and released (in dollars per share)	$ 46.32
Forfeited (in dollars per share)	$ 53.16
Outstanding at the end of the period (in dollars per share)	$ 52.24
Total intrinsic value
Total intrinsic value of restricted share units vested and released (in dollars)	$ 11.6	$ 10.5
Additional disclosures
Compensation cost not yet recognized	12.6
Weighted-average period over which compensation cost is to be recognized	2 years 4 months
Tax benefit realized from the distribution of shares	4.7	4.2
Performance Stock Rights Accounted For As Liability Awards
Performance Stock Rights and Restricted Stock Units Activity
Outstanding at the beginning of the period (in shares)	189,093
Granted (in shares)	90,496
Award modifications (in shares)	(28,789)
Distributed (in shares)	(61,753)
Adjustment for final payout (in shares)	14,255
Forfeited (in shares)	(4,398)
Outstanding at the end of period (in shares)	198,904
Weighted-Average Fair Value
Outstanding at the end of the period, fair value as of the reporting date (in dollars per share)	$ 47.32
Additional disclosures
Period prior to the end of the performance period during which employees cannot change their election to defer the value of award into deferred compensation plan	6 months
Performance Stock Rights Accounted For As Equity Awards
Performance Stock Rights and Restricted Stock Units Activity
Outstanding at the beginning of the period (in shares)	108,314
Granted (in shares)	22,636
Award modifications (in shares)	28,789
Distributed (in shares)	(94,758)
Adjustment for final payout (in shares)	21,867
Forfeited (in shares)	(1,099)
Outstanding at the end of period (in shares)	85,749
Weighted-Average Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 65.38
Granted (in dollars per share)	$ 48.50	$ 52.70
Award modifications (in dollars per share)	$ 39.80
Distributed (in dollars per share)	$ 72.36
Adjustment for final payout (in dollars per shares)	$ 72.36
Forfeited (in dollars per share)	$ 48.50
Outstanding at the end of the period (in dollars per share)	$ 46.62
Additional disclosures
Period prior to the end of the performance period during which employees cannot change their election to defer the value of award into deferred compensation plan	6 months
Performance Stock Rights
Total intrinsic value
Total intrinsic value of performance stock rights distributed during the period (in dollars)	8.8	4.7
Additional disclosures
Compensation cost not yet recognized	3.0
Weighted-average 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
Performance Stock Rights | Minimum
Assumptions Incorporated into Valuation Models
Period of historical volatility used to estimate expected volatility	2 years
Risk-free interest rate, minimum (as a percent)	0.26%
Expected dividend yield (as a percent)	5.18%
Expected volatility, minimum (as a percent)	19.00%
Performance Stock Rights | Maximum
Assumptions Incorporated into Valuation Models
Period of historical volatility used to estimate expected volatility	3 years
Risk-free interest rate, maximum (as a percent)	1.27%
Expected dividend yield (as a percent)	5.34%
Expected volatility rate, maximum (as a percent)	36.00%