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Share-Based Compensation Plans - Outstanding Restricted Stock Unit Awards (Detail) - Restricted Stock Unit Awards - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
NUMBER    
Balance at beginning of period (in shares) 2,644,762  
Granted (in shares) 772,848  
Distributed (in shares) (1,245,412)  
Forfeited (in shares) (26,547)  
Balance at end of period (in shares) 2,145,651  
Units Convertible, at the end of year (in shares) 19,770  
AGGREGATE INTRINSIC VALUE    
AGGREGATE INTRINSIC VALUE $ 199.8 $ 281.0
Units Convertible, at the end of year $ 1.8