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Per Common Share Information (Additional Information) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Earnings Per Share [Abstract]          
Dilutive effect of share-based compensation 7.3 6.8 7.0 7.3  
Stock options that were not included in diluted weighted-average shares 0.1 2.5 0.1 2.5  
Dividends Payable, Amount Per Share $ 1.25   $ 1.25    
Dividends payable $ 934.0   $ 934.0   $ 0.0