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Share-based Payments (Tables) | 9 Months Ended
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Sep. 30, 2025
Share-Based Payment Arrangement [Abstract] |
Compensation Costs Related to Share-Based Payments | The following table presents the components of share-based payment expense by consolidated income statement classification:
|  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Selling, general and administrative: |  |  |  |  |  |  |  |
Stock option compensation expense |  | $ | 0.1 |  |  | $ | 0.7 |  |  | $ | 0.6 |  |  | $ | 3.0 |
Equity-classified share units |  | 19.9 |  |  | 7.3 |  |  | 55.0 |  |  | 32.9 |
Liability-classified share units |  | 0.4 |  |  | 0.6 |  |  | 1.7 |  |  | 2.1 |
Employee share purchase plan |  | 1.4 |  |  | 1.2 |  |  | 5.7 |  |  | 5.8 |
|  | 21.8 |  |  | 9.8 |  |  | 63.0 |  |  | 43.8 |
Acquisition-related and integration costs: |  |  |  |  |  |  |  |
Acceleration of share-based payments expense |  | — |  |  | 0.1 |  |  | — |  |  | 1.0 |
Share-based continuing employment costs |  | 1.0 |  |  | 0.2 |  |  | 1.4 |  |  | 0.4 |
|  | 1.0 |  |  | 0.3 |  |  | 1.4 |  |  | 1.4 |
|  | $ | 22.8 |  |  | $ | 10.1 |  |  | $ | 64.4 |  |  | $ | 45.2 |
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity | The following table presents share unit activity for the nine months ended September 30, 2025 (actual number of units; weighted-average grant-date fair value per share unit):
| Equity-classified |  | Liability-classified
| Performance Share Units (Performance Conditions) |  | Performance Share Units (Market Conditions) |  | Restricted Share Units |  | Deferred Share Units
| Number |  | WA grant date fair value |  | Number |  | WA grant date fair value |  | Number |  | WA grant date fair value |  | Number |  | WA grant date fair value
Outstanding, December 31, 2024 | 450,175 |  | $ | 64.73 |  |  | 268,954 |  | $ | 105.53 |  |  | 607,805 |  | $ | 66.00 |  |  | 73,490 |  | $ | 40.29 |
Granted | 153,439 |  |  | 99.88 |  |  | 153,208 |  | 151.41 |  |  | 479,032 |  |  | 98.26 |  |  | 606 |  |  | 106.01 |
Vested and settled | (132,018) |  |  | 58.74 |  |  | — |  | — |  |  | (283,613) |  |  | 63.30 |  |  | (2,245) |  |  | 67.40 |
Forfeited | (4,155) |  |  | 73.41 |  |  | (2,870) |  | 125.54 |  |  | (29,704) |  |  | 81.11 |  |  | — |  |  | — |
Outstanding at September 30, 2025 | 467,441 |  | $ | 77.88 |  |  | 419,292 |  | $ | 122.16 |  |  | 773,520 |  | $ | 86.39 |  |  | 71,851 |  | $ | 40.00 |
Summary of Significant Assumptions Used to Estimate the Fair Value of Stock Options | fair value of PSUs with market vesting conditions was estimated using a Monte Carlo simulation model on the respective grant dates, incorporating the following significant assumptions, presented on a weighted average basis:
|  | Nine months ended September 30,
|  | 2025 | 2024
Risk free interest rate |  | 4.0 | % | 4.4 | %
Expected lives of the PSUs |  | 3 years | 3 years
Expected volatility |  | 30.4 | % | 32.2 | %
Average expected volatility of comparable companies |  | 34.7 | % | 48.3 | %

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 50 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/718-50/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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