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Stock-Based Compensation Plans (Tables)
9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 Nine Months Ended September 30, 2021
SharesWeighted Average
Grant-Date Fair
Value
Number of unvested shares:  
Outstanding - January 1, 20211,373,657 $46.76 
Granted1,000,997 39.59 
Vested(555,708)44.27 
Forfeited(133,649)47.19 
Outstanding as of September 30, 20211,685,297 $43.29