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Share-Based Compensation Expense and Effect on Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Share-based compensation expense $ 131.3 $ 110.0 $ 112.8
After tax $ 89.6 $ 76.0 $ 72.8
Earnings per common share-diluted $ 0.11 $ 0.08 $ 0.08