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Per Common Share Information (Additional Information) (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Dilutive effect of share-based compensation 6.7 7.8
Document Fiscal Year Focus 2019  
Stock options that were not included in diluted weighted-average shares 2.0 2.5