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Stock-Based Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 Six Months Ended June 30, 2021
SharesWeighted Average
Grant-Date Fair
Value
Number of unvested shares:  
Outstanding - January 1, 20211,373,657 $46.76 
Granted995,204 39.59 
Vested(550,370)44.27 
Forfeited(117,090)48.01 
Outstanding as of June 30, 20211,701,401 $43.29