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Subsequent Events (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 1 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2007
Jun. 30, 2012
Aug. 08, 2012
Subsequent Event [Member]
Subsequent Event [Line Items]          
Common stock sold through the program (in shares) 15,333,340 869,565 3,833,108 1,800,000 1,200,000
Proceeds from issuance of common stock $ 21.1 $ 2.7 $ 13.3 $ 5.8 $ 2.5
Amount available under the program assuming sufficient shares are available to be issued       $ 33.6 $ 31.0