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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Earnings Per Share [Abstract]          
Dilutive effect of share-based compensation 6.8 8.2 7.3 7.6  
Document Fiscal Year Focus     2018    
Stock options that were not included in diluted weighted-average shares 2.5 0.1 2.5 0.7  
Dividends Payable, Amount Per Share $ 1.16   $ 1.16    
Dividends payable $ 888.0   $ 888.0   $ 0.0