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Stock-based Compensation
 6 Months Ended
Jun. 30, 2023
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 March 31, 2023
688.4 316.4 1,004.8 $192.36 1.66
Granted345.2 151.8 497.0 137.67 
Vested(15.1)— (15.1)131.67 
Forfeited(15.1)(4.6)(19.7)186.15 
Unvested as of June 30, 2023
1,003.4 463.6 1,467.0 $174.54 1.85
Unvested as of March 31, 2022
786.8 466.1 1,252.9 $152.62 1.84
Granted188.5 113.0 301.5 224.59 
Vested(28.6)— (28.6)129.96 
Forfeited(7.7)(2.2)(9.9)173.02 
Unvested as of June 30, 2022
939.0 576.9 1,515.9 $167.23 1.98
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, 2022
841.3 567.0 1,408.3 $170.78 1.79
Granted345.2 182.8 528.0 136.13 
Vested(160.7)(257.2)(417.9)116.49 
Forfeited(22.4)(29.0)(51.4)148.89 
Unvested as of June 30, 2023
1,003.4 463.6 1,467.0 $174.54 1.85
Unvested as of December 31, 2021
912.4 646.0 1,558.4 $152.27 1.99
Granted188.5 113.0 301.5 223.61 
Vested(151.4)(175.1)(326.5)147.57 
Forfeited(10.5)(7.0)(17.5)173.44 
Unvested as of June 30, 2022
939.0 576.9 1,515.9 $167.23 1.98
As of June 30, 2023, we had $104.5 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2027.