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STOCK-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Roll Forward of Stock Options
The following table summarizes the status of, and changes in, our stock options during the three months ended March 31, 2024.

Options
Weighted-
average
exercise
price
Outstanding at December 31, 2023
1,476,104 $75.39 
Exercised(348,728)$76.47 
Expired(1,768)$76.75 
Outstanding at March 31, 2024
1,125,608 $75.06 
Exercisable at March 31, 2024
1,125,608 $75.06 
Schedule of Roll Forward of Nonvested Restricted Shares and Restricted 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, 2024.
Restricted
shares
Restricted
stock
units
Weighted-average
fair value
Nonvested at December 31, 2023
56,740 6,485,253 $127.74 
Time-based grants— 13,136 $108.66 
Dividend equivalents granted to non-employee directors— 973 $121.92 
Vested— (40,241)$98.65 
Forfeited— (30,035)$127.15 
Nonvested at March 31, 2024
56,740 6,429,086 $127.89 
Schedule of 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, 2024. 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 2024$58.2 
Third quarter 202457.2 
Fourth quarter 202450.2 
2025118.8 
2026 through 202988.4 
Total$372.8