XML 36 R22.htm IDEA: XBRL DOCUMENT v3.8.0.1
Per Common Share Information (Additional Information) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Earnings Per Share [Abstract]          
Dilutive effect of share-based compensation 8.2 6.3 7.6 7.1  
Stock options that were not included in diluted weighted-average shares 0.1 4.2 0.7 1.2  
Dividends Payable, Amount Per Share $ 1.01   $ 1.01    
Dividends payable $ 797.4   $ 797.4   $ 0.0