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Common Shareholders' Equity (Narrative) (Details) (USD $)
In Millions, except Share data
1 Months Ended3 Months Ended9 Months Ended12 Months Ended
Jun. 30, 2011
Oct. 27, 2010
Sep. 30, 2011
Dec. 31, 2010
Mar. 31, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2009
Common Shareholders' Equity [Abstract]        
Common stock, shares authorized  250,000,000250,000,000 250,000,000  
Common stock, shares outstanding  117,724,111116,924,844 117,724,111  
Amount authorized to be repurchased $ 200      
Stock repurchased, shares   2,040,000145,9150  
Shares repurchase average per share price   $ 25.75$ 26.71   
Amount available to be used to repurchase stock  147.5     
Amount of stock repurchase       3.9
Warrants exercised700,000       
Proceeds from exercise of warrants$ 14.7    $ 14.7$ 0 
Repurchase of warrants outstanding  1,000,000  1,000,000  
Common shares exercise price$ 130