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Stock-based Compensation
 3 Months Ended
Mar. 31, 2022
Share-based Payment Arrangement [Abstract]  
Stock-based Compensation STOCK-BASED COMPENSATION
Stock Unit Awards
Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.
RSU Shares
(in 000's)		PSU Shares
(in 000's)		Total Shares
(in 000's)		Weighted Average
Grant Date
Fair Value		Weighted Average
Remaining
Contractual Life
(in years)
Unvested as of December 31, 2021912.4 646.0 1,558.4 $152.27 1.99
Granted— — — — 
Vested(122.8)(175.1)(297.9)150.29 
Forfeited(2.8)(4.8)(7.6)174.32 
Unvested as of March 31, 2022786.8 466.1 1,252.9 $152.62 1.84
Unvested as of December 31, 20201,096.2 531.5 1,627.7 $137.42 1.69
Granted56.6 — 56.6 145.93 
Vested(207.5)(79.0)(286.5)150.76 
Forfeited(5.0)(13.4)(18.4)149.11 
Unvested as of March 31, 2021940.3 439.1 1,379.4 $134.84 1.70
As of March 31, 2022, we had $86.5 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2026.