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Per Common Share Information	3 Months Ended
Per Common Share Information	Mar. 31, 2017
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 6.4 million shares and 7.4 million shares for the first quarter 2017 and 2016, respectively. Stock options that would have been antidilutive, and therefore were not included in the calculation of diluted weighted-average shares, totaled 4.6 million shares and 4.2 million shares for the first quarter 2017 and 2016, respectively.