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Share-based Payments
 3 Months Ended
Mar. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Share-based Payments
Note 16. Share-based Payments
The following table presents the components of share-based payment expense by consolidated income statement classification:
Three months ended
March 31,
20252024
Selling, general and administrative:
Stock option compensation expense$0.4 $1.5 
Equity-classified share units11.6 8.3 
Liability-classified share units0.8 1.3 
Employee share purchase plan2.6 2.9 
15.4 14.0 
Acquisition-related and integration costs:  
Acceleration of share-based payments expense— 0.9 
Share-based continuing employment costs0.2 0.2 
0.2 1.1 
$15.6 $15.1 
Share units
The following table presents share unit activity for the three months ended March 31, 2025:
Equity-classifiedLiability-classified
Performance Share Units (Performance Conditions)Performance Share Units (Market Conditions)Restricted Share UnitsDeferred Share Units
NumberWA 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 
Granted148,58595.64 148,355139.95 436,75497.16 21997.30 
Vested and settled(132,018)58.74 —— (250,885)62.27 — — 
Forfeited(2,930)67.31 (1,645)120.49 (11,630)69.99 — — 
Outstanding at March 31, 2025463,812$76.32 415,664$117.76 782,044$84.54 73,709$40.45 

Performance Share Units ("PSUs")
During the three months ended March 31, 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:
Three months ended
March 31,
20252024
Risk free interest rate4.0 %4.5 %
Expected lives of the PSUs3 years3 years
Expected volatility30.5 %32.2 %
Average expected volatility of comparable companies34.7 %48.3 %
Restricted Share Units ("RSUs")
During the three months ended March 31, 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 three 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.