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Per Common Share Information
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share [Text Block] 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 5.2 million shares and 5.9 million shares for the quarters 2021 and 2020, respectively. Share-based compensation awards that would have been antidilutive, and therefore were not included in the calculation of diluted weighted-average shares, totaled 3.6 million shares and 2.0 million shares for the quarters 2021 and 2020, respectively.