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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2025
Share-Based Payment Arrangement [Abstract] |
Activity for CIUs | Activity for CIUs, which are classified as a liability, is as follows:
| Units
| (000s)
Outstanding at December 31, 2024 | 16,455 |
Granted | 15,545 |
Vested | (13,228) |
Outstanding at December 31, 2025 | 18,772 |
Schedule of Cash-based Payment Award, Cash-incentive Units, Valuation Assumptions | The fair value of CIUs is estimated at each reporting period using the Monte-Carlo simulation mode l. Key assumptions used to value CIUs granted are as follows:
| Assumptions as of the Year Ended December 31, 2025
| 2025 Grant |  | 2024 Grant
Expected Volatility (based on our and our peer group historical daily stock prices) | 30 | % |  | 28 | %
Expected Life (equals the remaining performance period) | 2 years |  | 1 year
Risk Free Interest Rate (based on U.S. Treasury yields) | 3.43 | % |  | 3.46 | %
|  |  | Assumptions as of the Year Ended December 31, 2024
|  |  | 2024 Grant |  | 2023 Grant
Expected Volatility (based on our and our peer group historical daily stock prices) |  |  | 30 | % |  | 30 | %
Expected Life (equals the remaining performance period) |  |  | 2 years |  | 1 year
Risk Free Interest Rate (based on U.S. Treasury yields) |  |  | 4.25 | % |  | 4.19 | %
| Assumptions as of the Year Ended December 31, 2023
| 2023 Grant |  | 2022 Grant
Expected Volatility (based on our and our peer group historical daily stock prices) | 30 | % |  | 27 | %
Expected Life (equals the remaining performance period) | 2 years |  | 1 year
Risk Free Interest Rate (based on U.S. Treasury yields) | 4.26 | % |  | 4.75 | %
Activity for Restricted Stock Units | Activity for RSUs, which are classified as equity, is as follows:
|  |  | Weighted Average
| Shares |  | Grant Date
| (000s) |  | Fair Value
Outstanding at December 31, 2024 | 987 |  |  | $ | 44.31 |
Granted | 550 |  |  | 81.16 |
Vested | (688) |  |  | 50.85 |
Forfeited | (50) |  |  | 60.34 |
Outstanding at December 31, 2025 | 799 |  |  | 63.05 |
Schedule of Compensation Cost for Share-based Payment Arrangements | Compensation expense for the stock based plans, as reported in our consolidated statements of income, is as follows:
| Year Ended December 31
| 2025 |  | 2024 |  | 2023
| (in millions of dollars)
Cash Incentive Units | $ | 15.3 |  |  | $ | 12.4 |  |  | $ | 21.7 |
Restricted Stock Units | 37.3 |  |  | 34.5 |  |  | 40.3 |
Other | 1.0 |  |  | 0.9 |  |  | 2.1 |
Total Compensation Expense, Before Income Tax | $ | 53.6 |  |  | $ | 47.8 |  |  | $ | 64.1 |
Total Compensation Expense, Net of Income Tax | $ | 47.3 |  |  | $ | 41.6 |  |  | $ | 57.5 |
Certain prior year amounts in the preceding chart have been reclassified to conform to current presentation.

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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