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Per Common Share Information (Additional Information) (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Dilutive effect of share-based compensation 6.9 7.1 6.9 7.6
Stock options that were not included in diluted weighted-average shares 1.1 2.6 2.0 2.6