COMMON STOCK (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Treasury stock transactions [Abstract]
Number of shares of common stock repurchased (in shares)	7,244,450	740,000
Treasury stock acquired	$ (78.0)	$ (10.7)
Value of authorized repurchases still available	$ 215.4