STOCK-BASED COMPENSATION (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Apr. 23, 2009
STOCK-BASED COMPENSATION [Abstract]
Stock-based compensation	$ 8.8	$ 10.1	$ 8.6
Mark-to-market adjustments	(0.5)	1.2	0.8
Total expense	8.3	11.3	9.4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, restricted stock and performance shares vesting period (in years)	three
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)				3,000,000
Stock Options Activity [Rollforward]
Outstanding at January 1, 2011 (in shares)	3,849,411
Granted (in shares)	575,000	803,750	866,250
Exercised (in shares)	(508,247)	(200,000)	0
Canceled (in shares)	(151,294)
Outstanding, December 31, 2011 (in shares)	3,764,870	3,849,411
Option Price, outstanding, beginning of period, minimum (in dollars per share)	$ 6.98
Option price, outstanding, beginning of period, maximum (in dollars per share)	$ 23.78
Option price, granted (in dollars per share)	$ 18.78
Option price, exercised, minimum (in dollars per share)	$ 6.98
Option price exercised, maximum (in dollars per share)	$ 23.78
Option price, canceled, minimum (in dollars per share)	$ 6.98
Option price, canceled, maximum (in dollars per share)	$ 20.67
Option price, outstanding, minimum, end of period (in dollars per share)	$ 14.28
Option price, outstanding, maximum, end of period (in dollars per share)	$ 23.78
Weighted average option price, beginning of period (in dollars per share)	$ 17.53
Weighted average option price, granted (in dollars per share)	$ 18.78	$ 15.68	$ 14.28
Weighted average option price, exercised (in dollars per share)	$ 16.59
Weighted average option price, canceled (in dollars per share)	$ 17.69
Weighted average option price, outstanding, end of period (in dollars per share)	$ 17.84	$ 17.53
Options exercisable, beginning of period (in shares)	2,336,195
Options exercisable, end of period (in shares)	2,415,347	2,336,195
Weighted average exercise price, exercisable , beginning of period (in dollars per share)	$ 18.73
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 18.46	$ 18.73
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options exercisable (in shares)	2,415,347
Options outstanding (in shares)	3,764,870
Under $16 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, maximum, (in dollars per share)	$ 16.00
Options exercisable (in shares)	669,241
Weighted average exercise price, exercisable (in dollars per share)	$ 14.83
Options outstanding (in shares)	1,443,764
Weighted average exercise price, outstanding (in dollars per share)	$ 15.03
$16-$20[Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 16.00
Range of exercise price, maximum, (in dollars per share)	$ 20.00
Options exercisable (in shares)	586,914
Weighted average exercise price, exercisable (in dollars per share)	$ 16.99
Options outstanding (in shares)	1,161,914
Weighted average exercise price, outstanding (in dollars per share)	$ 17.88
Over $20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise price, minimum, (in dollars per share)	$ 20.00
Options exercisable (in shares)	1,159,192
Weighted average exercise price, exercisable (in dollars per share)	$ 21.30
Options outstanding (in shares)	1,159,192
Weighted average exercise price, outstanding (in dollars per share)	$ 21.30
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option and long-term incentive plans, exercisable period (in years)	10
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	7,071,722
Number of shares available for grant or purchase (in shares)	2,635,972
Sub-limit for all types of stock awards included in available to be issued stock options (in shares)	1,710,972
Average exercise period for outstanding options (in months)	74
Average exercise period for exercisable options (in months)	59
Aggregate intrinsic value for outstanding options	9.1
Aggregate intrinsic value for exercisable options	4.9
Total intrinsic value of options exercised	4.2	0.9
Total unrecognized compensation, unvested	3.4
Total unrecognized compensation, unvested, weighted average recognition period (in years)	1.2
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance share award cycle (in years)	3
Liability recorded for performance shares to be settled in cash	4.0
Total unrecognized compensation, unvested	$ 2.5
Total unrecognized compensation, unvested, weighted average recognition period (in years)	1.1
Performance Shares [Member] | To Settle in Cash [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at January 1, 2011, performance shares (in shares)	312,625
Granted, performance shares (in shares)	65,250
Paid/Issued, performance shares (in shares)	(112,083)
Converted from shares to cash (in shares)	5,972
Canceled, performance shares (in shares)	(4,028)
Shares outstanding at December 31, 2011, performance shares (in shares)	267,736
Total vested, at December 31, 2011, performance shares (in shares)	200,236
Weighted average fair value, outstanding, at January 1, 2011, performance shares (in dollars per share)	$ 20.65
Weighted average fair value, granted, performance shares (in dollars per share)	$ 18.78
Weighted average fair value, paid/issued, performance shares (in dollars per share)	$ 20.65
Weighted average fair value, converted from shares to cash, performance shares (in dollars per share)	$ 14.62
Weighted average fair value, canceled, performance shares (in dollars per share)	$ 20.65
Weighted average fair value, outstanding, at December 31, 2011, performance shares (in dollars per share)	$ 19.78
Weighted average fair value, total vested, at December 31, 2011, performance shares (in dollars per share)	$ 19.78
Performance Shares [Member] | To Settle in Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding at January 1, 2011, performance shares (in shares)	303,875
Granted, performance shares (in shares)	65,250
Paid/Issued, performance shares (in shares)	(105,000)
Converted from shares to cash (in shares)	(5,972)
Canceled, performance shares (in shares)	(4,028)
Shares outstanding at December 31, 2011, performance shares (in shares)	254,125
Total vested, at December 31, 2011, performance shares (in shares)	186,625
Weighted average fair value, outstanding, at January 1, 2011, performance shares (in dollars per share)	$ 16.71
Weighted average fair value, granted, performance shares (in dollars per share)	$ 18.78
Weighted average fair value, paid/issued, performance shares (in dollars per share)	$ 20.29
Weighted average fair value, converted from shares to cash, performance shares (in dollars per share)	$ 14.62
Weighted average fair value, canceled, performance shares (in dollars per share)	$ 15.08
Weighted average fair value, outstanding, at December 31, 2011, performance shares (in dollars per share)	$ 15.83
Weighted average fair value, total vested, at December 31, 2011, performance shares (in dollars per share)	$ 15.16
Unvested Performance Shares [Rollforward]
Unvested, beginning of period (in shares)	91,542
Granted (in shares)	65,250
Vested (in shares)	(85,264)
Canceled (in shares)	(4,028)
Unvested, end of period (in shares)	67,500
Weighted average fair value per share, beginning of period (in dollars per share)	$ 20.65
Weighted average fair value per share, granted (in dollars per share)	$ 18.78
Weighted average fair value, vested (in dollars per share)	$ 19.78
Weighted average fair value, end of period (in dollars per share)	$ 19.78
Weighted average fair value, canceled (in dollars per share)	$ 20.65
2000 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	629,563
Number of shares available for grant or purchase (in shares)	24,780
2003 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	919,496
Number of shares available for grant or purchase (in shares)	63,676
2006 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	2,456,127
Number of shares available for grant or purchase (in shares)	122,516
2009 Long Term Incentive Plan[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	3,000,000
Number of shares available for grant or purchase (in shares)	2,425,000
Stock Option Plan 1996 (Plan Expired) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	66,536
Number of shares available for grant or purchase (in shares)	0
Long Term Incentive Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	7,005,186
Number of shares available for grant or purchase (in shares)	2,635,972
1997 Stock Plan For Non Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	603,507
Number of shares available for grant or purchase (in shares)	269,763
Employee deferral Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	46,561
Number of shares available for grant or purchase (in shares)	45,669
Stock Purchase Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long Term Incentive Plan authorized additional shares reserved for issuance (in shares)	650,068
Number of shares available for grant or purchase (in shares)	315,432
Committed shares reserved under the stock purchase plans for non employee Directors (in shares)	334,631