CAPITAL STOCK (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock authorized (in shares)	1,000,000	1,000,000
Par value per share of preferred stock (in dollars per share)	$ 0.01	$ 0.01
Stock Repurchase Program, Authorized Amount				$ 100	$ 100
Stock repurchased (in shares)				4,254,397	809,236
Total purchase price, including commissions				93.2	26.6
Total purchase price, including commissions per share (in dollars per share)				$ 21.90	$ 32.92
Authorized amount remaining for future stock repurchases	80.3
Shares tendered for tax withholding for share-based compensation (in shares)	9,802	7,929	14,447
Adjustments related to tax withholding for share based compensation	$ 0.1	$ 0.1	$ 0.2
Stock Incentive Plans [Abstract]
Shares available for issuance	3,465,832
Stock Options [Member]
Stock Incentive Plans [Abstract]
Vesting period, maximum (in years)	4
Vesting period, minimum (in years)	1
Maximum term (in years)	7
Restricted Stock Units (RSUs) [Member]
Stock Incentive Plans [Abstract]
Shares available for issuance	428,508
Employee Stock Purchase Plan [Member]
Stock Incentive Plans [Abstract]
Shares available for issuance	612,507