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Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 0 Months Ended
Oct. 31, 2013
May 31, 2012
Jun. 30, 2009
Nov. 04, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]        
Common stock sold through the equity offering program (in shares) 1.3 1.0 0.1 0.3
Net proceeds from sale of common stock under equity offering program       $ 0.4
Remaining amount available in equity offering program       $ 40.0