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Stock-Based Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Information Regarding Restricted Shares
The following table summarizes information regarding Restricted Shares:
 Six Months Ended June 30, 2020
SharesWeighted Average
Grant-Date Fair
Value
Number of unvested shares:  
Outstanding - January 1, 20201,690,600  $46.71  
Granted697,472  47.12  
Vested(458,639) 45.76  
Forfeited(325,048) 49.72  
Outstanding as of June 30, 20201,604,385  $46.55