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Share-based Payments
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Share-based Payments
Note 17. 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,
2025202420252024
Selling, general and administrative:
Stock option compensation expense$0.1 $0.7 $0.6 $3.0 
Equity-classified share units19.9 7.3 55.0 32.9 
Liability-classified share units0.4 0.6 1.7 2.1 
Employee share purchase plan1.4 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 costs1.0 0.2 1.4 0.4 
1.0 0.3 1.4 1.4 
$22.8 $10.1 $64.4 $45.2 
Share units
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-classifiedLiability-classified
Performance Share Units (Performance Conditions)Performance Share Units (Market Conditions)Restricted Share UnitsDeferred Share Units
Number WA grant
date fair
value		NumberWA grant
date fair
value		NumberWA grant
date fair
value		NumberWA grant
date fair
value
Outstanding, December 31, 2024450,175$64.73 268,954$105.53 607,805$66.00 73,490$40.29 
Granted153,439 99.88 153,208151.41 479,032 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, 2025467,441$77.88 419,292$122.16 773,520$86.39 71,851$40.00 
Performance Share Units ("PSUs")
During the nine months ended September 30, 2025, the Company granted PSUs to executives and senior employees, approximately half of which have performance vesting conditions and approximately half of which have market vesting conditions, conditional upon the Company's total shareholder return relative to a peer group. The PSUs have three-year performance and market vesting periods.
The fair values of PSUs with performance vesting conditions were estimated using the closing price of the Company's common shares listed on the NYSE on the respective grant dates and the 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,
20252024
Risk free interest rate4.0 %4.4 %
Expected lives of the PSUs3 years3 years
Expected volatility30.4 %32.2 %
Average expected volatility of comparable companies34.7 %48.3 %
Restricted Share Units ("RSUs")
During the nine months ended September 30, 2025, the Company granted RSUs to employees which have service vesting conditions. The RSUs vest over a three-year graded vesting period or cliff vest after 3 years, depending on the terms of the grant.
The fair values of RSUs were estimated using the closing price of the Company's common shares listed on the NYSE on the respective grant dates.