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Per Common Share Information (Additional Information) (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]        
Dilutive effect of share-based compensation 5.5 7.3 5.4 7.0
Stock options that were not included in diluted weighted-average shares 1.8 0.1 1.9 0.1