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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2022
Share-based Payment Arrangement [Abstract]  
Restricted Stock Unit and Performance Stock Unit Activity
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, 2022786.8 466.1 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, 2022939.0 576.9 1,515.9 $167.23 1.98
Unvested as of March 31, 2021940.3 439.1 1,379.4 $134.84 1.70
Granted200.5 107.2 307.7 186.21 
Vested(10.7)— (10.7)142.07 
Forfeited(12.0)(1.1)(13.1)123.85 
Unvested as of June 30, 20211,118.1 545.2 1,663.3 $144.01 1.92
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
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, 2022939.0 576.9 1,515.9 $167.23 1.98
Unvested as of December 31, 20201,096.2 531.5 1,627.7 $137.42 1.69
Granted257.1 107.2 364.3 179.95 
Vested(218.1)(79.0)(297.1)150.45 
Forfeited(17.1)(14.5)(31.6)138.47 
Unvested as of June 30, 20211,118.1 545.2 1,663.3 $144.01 1.92