STOCK-BASED COMPENSATION PLANS (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	May 25, 2011
STOCK-BASED COMPENSATION PLANS [Abstract]
Shares of common stock authorized for stock-based compensation plan (in shares)	4,000,000
Additional shares of common stock authorized for stock-based compensation plan ( in shares)				900,000
Number of shares available for grant (in shares)	1,008,234
Term of options	10 years
Options vesting period	5 years
Options [Abstract]
Options outstanding, Shares (in shares)	2,274,891
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 24.03
Options outstanding, Weighted-average Remaining Life (years)	5 years 9 months 22 days
Options exercisable, Shares (in shares)	1,478,489
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 22.40
Weighted-average remaining contractual term of outstanding stock options (in years)	5 years 9 months 18 days
Weighted-average remaining contractual term of outstanding and exercisable stock options (in years)	4 years 8 months 12 days
Aggregate intrinsic value of outstanding stock options	$ 35.6
Aggregate intrinsic value of exercisable stock options	25.5
Fair value assumptions and methodology [Abstract]
Fair value assumptions, method used	Black-Scholes model	Black-Scholes model	Black-Scholes model
Weighted-average fair value of options granted (in dollars per share)	$ 6.24	$ 6.40	$ 6.69
Assumptions [Abstract]
Weighted-average expected life	7 years 2 months 23 days	7 years 4 months 24 days	7 years 8 months 19 days
Future dividend yield (in hundredths)	3.90%	3.90%	3.90%
Share price volatility (in hundredths)	31.21%	31.79%	32.12%
Weighted-average risk-free interest rate (in hundredths)	1.91%	2.34%	3.34%
Unrecognized stock-based compensation expense	3.5
Weighted average period for recognition of unrecognized compensation cost (in years)	2 years 10 months 24 days
Total fair value of shares vested	2.0	1.7	1.8
Proceeds from stock option exercises	16.0	9.6
Related tax benefits from stock option exercises	1.6	1.1
Shares issued in connection with stock option exercise (in shares)	680,705	479,353
Total intrinsic value of options exercised	7.9	4.9	2.3
$0.00 - $18.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 0
Exercise price range, upper range limit (in dollars per share)	$ 18.00
Options [Abstract]
Options outstanding, Shares (in shares)	176,801
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 17.59
Options outstanding, Weighted-average Remaining Life (years)	5 years 1 month 20 days
Options exercisable, Shares (in shares)	176,801
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 17.59
$18.001 - $23.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 18.001
Exercise price range, upper range limit (in dollars per share)	$ 23.00
Options [Abstract]
Options outstanding, Shares (in shares)	742,163
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 19.59
Options outstanding, Weighted-average Remaining Life (years)	4 years 8 months 26 days
Options exercisable, Shares (in shares)	588,118
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 19.75
$23.001 - $28.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 23.001
Exercise price range, upper range limit (in dollars per share)	$ 28.00
Options [Abstract]
Options outstanding, Shares (in shares)	667,072
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 25.22
Options outstanding, Weighted-average Remaining Life (years)	4 years 1 month 20 days
Options exercisable, Shares (in shares)	546,370
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 24.75
$28.001 - $29.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 28.001
Exercise price range, upper range limit (in dollars per share)	$ 29.00
Options [Abstract]
Options outstanding, Shares (in shares)	327,464
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 28.78
Options outstanding, Weighted-average Remaining Life (years)	8 years 2 months 19 days
Options exercisable, Shares (in shares)	107,915
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 28.78
$29.001 - $30.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit (in dollars per share)	$ 29.001
Exercise price range, upper range limit (in dollars per share)	$ 30.00
Options [Abstract]
Options outstanding, Shares (in shares)	361,391
Options outstanding, Weighted-average Exercise Price (in dollars per share)	$ 29.79
Options outstanding, Weighted-average Remaining Life (years)	9 years 2 months 16 days
Options exercisable, Shares (in shares)	59,285
Options exercisable, Weighted-average Exercise Price (in dollars per share)	$ 29.79
Stock Options [Member]
Options, Outstanding [Roll Forward]
Outstanding, Beginning Period (in shares)	2,760,723	2,947,215
Granted (in shares)	369,589	356,765
Exercised (in shares)	(840,556)	(526,141)
Forfeited (in shares)	(14,865)	(17,116)
Outstanding, Ending Period (in shares)	2,274,891	2,760,723	2,947,215
Exercisable (in shares)	1,478,489
Weighted-average exercise price of shares [Abstract]
Outstanding, Beginning Period (in dollars per share)	$ 22.86	$ 21.43
Granted (in dollars per share)	$ 29.79	$ 28.78
Exercised (in dollars per share)	$ 22.70	$ 18.91
Forfeited (in dollars per share)	$ 24.45	$ 21.47
Outstanding, Ending Period (in dollars per share)	$ 24.03	$ 22.86	$ 21.43
Exercisable (in dollars per share)	$ 22.40
Stock-based compensation expense related to restricted stock vesting	2.0	1.8	1.8
Income tax benefit recognized	1.1	0.8	0.8
Restricted Stock [Member]
Weighted-average exercise price of shares [Abstract]
Stock-based compensation expense related to restricted stock vesting	$ 2.0	$ 1.8	$ 2.0
Restricted Shares [Roll Forward]
Unvested, beginning balance (in shares)	192,083	269,641
Awards (in shares)	142,353	64,705
Forfeitures (in shares)	(2,896)	(2,743)
Vestings (in shares)	(70,575)	(139,520)
Unvested, ending balance (in shares)	260,965	192,083	269,641
Weighted-average grant date fair value [Abstract]
Unvested, beginning balance (in dollars per share)	$ 23.98	$ 20.12
Awards (in dollars per share)	$ 22.13	$ 28.77
Forfeitures (in dollars per share)	$ 25.34	$ 23.19
Vestings (in dollars per share)	$ 22.28	$ 18.76
Unvested, ending balance (in dollars per share)	$ 23.42	$ 23.98	$ 20.12