COMMON EQUITY (Details) (USD $) In Millions, except Share data			1 Months Ended	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	May 31, 2010 Common Stock	Jun. 30, 2011 Common Stock
Common equity
Common stock issued under various compensation and dividend reinvestment plans, including the exercise of stock options				$ 50.1
Exercise of stock options				19,600
Number of shares underlying forward sales contracts (in shares)			6,600,000
Common Stock, Shares Authorized	200,000,000	150,000,000