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Net Income per Common Share (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Restricted Stock [Member]
   
Share-based compensation arrangement by share-based payment award [Line Items]    
Weighted average number of awards outstanding for computation of diluted earnings per share (in shares) 0 0
Weighted average number of awards outstanding excluded from the computation of diluted earnings per share (in shares) 0 0.1
Stock Option [Member]
   
Share-based compensation arrangement by share-based payment award [Line Items]    
Weighted average number of awards outstanding for computation of diluted earnings per share (in shares) 0 0
Weighted average number of awards outstanding excluded from the computation of diluted earnings per share (in shares) 1.1 1.3