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STOCK-BASED COMPENSATION
 6 Months Ended
Jun. 30, 2024
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 six months ended June 30, 2024.
Options
Weighted-
average
exercise
price
Outstanding at December 31, 2023
1,476,104 $75.39 
Exercised(420,387)$76.62 
Expired(1,768)$76.75 
Outstanding and exercisable at June 30, 2024
1,053,949 $74.90 

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 six months ended June 30, 2024.
Restricted
shares
Restricted
stock
units
Weighted-average
fair value
Nonvested at December 31, 2023
56,740 6,485,253 $127.74 
Time-based grants8,970 39,896 $111.02 
Dividend equivalents granted to non-employee directors— 1,860 $118.83 
Vested(17,682)(61,026)$105.98 
Forfeited— (98,941)$127.48 
Nonvested at June 30, 2024
48,028 6,367,042 $127.89 

Nonvested at June 30, 2024, includes performance-based restricted stock units of 334,548. These nonvested performance-based restricted stock units include 108,775 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 June 30, 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)
Third quarter 2024$57.1 
Fourth quarter 202450.2 
2025118.4 
2026 through 202987.9 
Total$313.6