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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 OPTIONS.

The following table summarizes the status of, and changes in, our stock options during the three months ended March 31, 2022.
Options
Weighted-
average
exercise
price
Outstanding at December 31, 20212,846,579 $72.87 
Exercised(214,772)$64.58 
Outstanding at March 31, 20222,631,807 $73.55 
Exercisable at March 31, 20222,631,807 $73.55 
RESTRICTED SHARES AND STOCK UNITS.

The following table summarizes the status of, and changes in, our nonvested restricted shares and restricted stock units during the three months ended March 31, 2022.
Restricted
shares
Restricted
stock
units
Weighted-average
fair value
Nonvested at December 31, 20215,720 5,701,865 $146.87 
Time-based grants— 8,078 $173.08 
Dividend equivalents granted to non-employee directors— 786 $153.10 
Vested— (62,378)$98.23 
Forfeited— (61,216)$141.91 
Nonvested at March 31, 20225,720 5,587,135 $147.50 

Nonvested at March 31, 2022, includes performance-based restricted stock units of 294,518. These nonvested performance-based restricted stock units include 81,123 units for which the performance period has lapsed, and the performance threshold has been met.

FUTURE STOCK-BASED COMPENSATION EXPENSE.

The following table presents the compensation expense to be recognized over the remaining vesting periods of the stock-based awards outstanding at March 31, 2022. Estimated future compensation expense will change to reflect future grants of restricted stock awards and units, future option grants, changes in the probability of performance thresholds being met, and adjustments for actual forfeitures.
 
(in millions)
Second quarter 2022$64.0 
Third quarter 202263.1 
Fourth quarter 202254.3 
2023125.5 
2024 through 2026105.4 
Total$412.3