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TREASURY STOCK PURCHASE (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Oct. 31, 2011
2011 Repurchase Plan
Mar. 31, 2010
2010 Repurchase Plan
Dec. 31, 2011
2010 Repurchase Plan
TREASURY STOCK PURCHASE      
Amount of common stock the board of directors authorized to repurchase $ 250.0 $ 200.0  
Common stock repurchased (in shares)     5.0
Average purchase price (in dollars per share)     $ 35.63
Common stock repurchased     $ 176.4