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LONG-TERM INCENTIVE COMPENSATION (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2025:

Options
Weighted-
average
exercise
price
Outstanding at December 31, 2024
661,377 $73.76 
Exercised(642,149)$73.89 
Expired(1,560)$79.71 
Outstanding and exercisable at September 30, 2025
17,668 $68.49 
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 nine months ended September 30, 2025:
Restricted
stock
units
Weighted-average
fair value
Nonvested at December 31, 2024
6,001,579 $124.73 
Time-based grants29,447 $100.45 
Vested(33,281)$126.38 
Forfeited(283,954)$126.82 
Nonvested at September 30, 2025
5,713,791 $124.49 
Below is a roll forward of the restricted fund units liability, which is reported in deferred compensation liabilities on the unaudited consolidated balance sheet.

(in millions)
Balance at December 31, 2024
$14.7 
Amortization of grant date value32.8 
Amortization of market appreciation (depreciation)5.8 
Balance at September 30, 2025
$53.3 
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 September 30, 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)
Fourth quarter 2025$42.9 
202696.3 
2027 through 203064.9 
Total$204.1 
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 September 30, 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)
Fourth quarter 2025$9.9 
202624.7 
2027 through 202923.3 
Total$57.9