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Net Income per Common Share - Additional Information (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]        
Anti-dilutive securities excluded from computation of earnings per share amount (in shares) 0.2 0 0.2 0