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LONG-TERM INCENTIVE COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2025
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, 2025.

Options
Weighted-
average
exercise
price
Outstanding at December 31, 2024
661,377 $73.76 
Exercised(314,509)$78.11 
Expired(1,560)$79.71 
Outstanding and exercisable at March 31, 2025
345,308 $69.77 
Schedule of Roll Forward of Nonvested Restricted Stock Units
The following table summarizes the status of, and changes in, our nonvested restricted stock units during the three months ended March 31, 2025.
Restricted
stock
units
Weighted-average
fair value
Nonvested at December 31, 2024
6,001,579 $124.73 
Time-based grants7,544 $114.78 
Vested(7,554)$127.26 
Forfeited(39,170)$134.92 
Nonvested at March 31, 2025
5,962,399 $124.65 
Below is a roll forward of the restricted fund units liability which is reported in deferred compensation liabilities on the consolidated balance sheet.

(in millions)3/31/2025
Balance at beginning of year$14.7 
Amortization of grant date value11.8 
Amortization of market appreciation (depreciation)(0.5)
Balance at end of year$26.0 
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, 2025. 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 2025$51.8 
Third quarter 202551.2 
Fourth quarter 202544.5 
2026100.0 
2027 through 203067.1 
Total$314.6 
Schedule of Future Stock-based Compensation Expense to be Recognized over the Remaining Vesting Periods of the Restricted Fund Unit Awards
The following table presents the compensation expense to be recognized over the remaining vesting periods of the restricted fund units outstanding at March 31, 2025. Estimated future compensation expense will change to reflect future grants, changes in the market value of the restricted fund units which is based on selected hypothetical investments, and adjustments for actual forfeitures. The grants outstanding will vest by 2029.
(in millions)
Second quarter 2025$11.0 
Third quarter 202510.9 
Fourth quarter 20258.9 
202622.3 
2027 through 202921.0 
Total$74.1