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Stock-based Compensation Plans (Tables)
6 Months Ended
Jun. 30, 2021
Stock-Based Compensation Plans [Abstract]  
Summary of RSUs and PSUs Granted A summary of the RSUs and PSUs granted during 2021 is presented below (units in thousands):
Grant YearAward Type
Number of Units Awarded (1)
Vesting Terms
2021RSU63
Vest equally over three service periods ending in 2024
2021PSU27
Three-year performance and service period ending in 2023
2021RSU5
One-year service period ending in 2022
(1) PSUs reflect the target number of units for the original PSU grant.