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Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2007
Sep. 30, 2012
Subsequent Event [Line Items]        
Common stock sold through the program (in shares) 15,333,340 869,565 3,833,108 6,500,000
Proceeds from issuance of common stock $ 21.1 $ 2.7 $ 13.3 $ 14.6
Amount available under the program assuming sufficient shares are available to be issued       24.5
Subsequent Event [Member]
        
Subsequent Event [Line Items]        
Common stock sold through the program (in shares)       1,700,000
Proceeds from issuance of common stock       3.0
Amount available under the program assuming sufficient shares are available to be issued       $ 21.5