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Earnings Per Common Share (Narrative) (Details)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Effect of options to purchase common stock 7.0 5.8 7.9 5.0