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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Payment Arrangement [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 Six Months Ended June 30, 2022
SharesWeighted Average
Grant-Date Fair
Value
Number of unvested shares:  
Outstanding as of January 1, 20221,671,011 $43.06 
Granted967,278 32.93 
Vested(523,055)43.03 
Forfeited(214,147)45.72 
Outstanding as of June 30, 20221,901,087 $37.62