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Share-based Payments
 3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Share-based Payments
16. Share-based Payments
Share-based payments consist of the following compensation costs:
Three months ended
March 31,
20242023
Selling, general and administrative:
Stock option compensation expense$1.5 $2.6 
Equity-classified share units8.3 3.5 
Liability-classified share units1.3 — 
Employee share purchase plan2.9 0.6 
14.0 6.7 
Acquisition-related and integration costs:  
Acceleration of share-based payments expense0.9 5.0 
Share-based continuing employment costs0.2 1.0 
1.1 6.0 
$15.1 $12.7 
Stock Options
There were no stock options granted during the three months ended March 31, 2024.
Share Unit Plans
Share unit activity for the three months ended March 31, 2024 is presented below:
Equity-classified awardsLiability-classified awards
PSUs with Performance ConditionsPSUs with Market ConditionsRSUsDSUs
NumberWA grant
date fair
value		NumberWA grant
date fair
value		NumberWA grant
date fair
value		NumberWA grant
date fair
value
Outstanding, December 31, 2023415,429$58.35 174,260$74.83 539,671$53.64 100,560$38.36 
Granted139,19475.13 138,421120.42 265,54775.23 5,11269.56 
Vested and settled(114,315)58.79 —— (187,744)53.59 (3,743)59.03 
Forfeited(291)57.70 — — (18,868)54.94 (32)59.03 
Outstanding at March 31, 2024440,017$63.54 312,681$95.01 598,606$63.19 101,897$39.16 
______________________________________________________________
The total market value of liability-classified share units settled in cash during the three months ended March 31, 2024 was $0.2 million (three months ended March 31, 2023: nil).
PSUs
In March 2024, the Company granted 276,276 PSUs that are equity-settled to executives and senior employees, half of which vest based on performance conditions and half of which vest based on market conditions, conditional upon the Company's total shareholder return relative to a peer group. The PSU's granted have a three year vesting period beginning on January 1, 2024.
The fair value of PSUs with performance vesting conditions was estimated on the grant date using the closing market price of the Company's common shares listed on the NYSE. The fair value of PSUs with market vesting conditions was estimated on the grant date using a Monte Carlo simulation model and was $120.49 per unit.
The significant assumptions used to estimate the fair value of the PSUs with market vesting conditions are presented in the following table:
Three months ended March 31,2024
Risk free interest rate4.5 %
Expected lives of the PSUs3 years
Expected volatility32.2 %
Average expected volatility of comparable companies48.3 %
RSUs
During the three months ended March 31, 2024, the Company granted 263,930 RSUs that are equity-settled and not subject to market vesting conditions. The fair value per RSU was estimated on its grant date using the market close price of the Company's common shares listed on the NYSE.