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Per Common Share Information
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Per Common Share Information
Per Common Share Information
Diluted earnings per common share is calculated using net income divided by diluted weighted-average shares. Diluted weighted-average shares include weighted-average shares outstanding plus the dilutive effect of share-based compensation, calculated using the treasury stock method, of 4.9 million shares and 6.3 million shares for the first quarter 2015 and 2014, respectively. Stock options that would have been antidilutive and therefore were not included in the calculation of diluted weighted-average shares totaled 12.7 million shares and 9.2 million shares for the first quarter 2015 and 2014, respectively.