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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Restricted shares, performance-based restricted share units and performance share unit activity
The following table presents activity for non-vested RSUs and performance share units under the Plan in 2021.
Number of AwardsWeighted Average Grant Date Fair Value
Balance as of January 1, 20212,439,141 $40.56 
Awards granted1,044,772 45.82 
Awards vested(789,495)46.13 
Awards forfeited, canceled or expired(355,881)40.19 
Performance-based adjustment37,061 43.70 
Balance as of December 31, 20212,375,598 41.21