Share-based Payments (Tables)

3 Months Ended

Mar. 31, 2024

Share-based payments consist of the following compensation costs:


	Three months ended March 31,
	2024		2023
Selling, general and administrative:
Stock option compensation expense	$	1.5	$	2.6
Equity-classified share units	8.3		3.5
Liability-classified share units	1.3		—
Employee share purchase plan	2.9		0.6
	14.0		6.7
Acquisition-related and integration costs:
Acceleration of share-based payments expense	0.9		5.0
Share-based continuing employment costs	0.2		1.0
	1.1		6.0
	$	15.1	$	12.7

Share unit activity for the three months ended March 31, 2024 is presented below:


	Equity-classified awards									Liability-classified awards
	PSUs with Performance Conditions			PSUs with Market Conditions			RSUs			DSUs
	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, 2023	415,429	$	58.35	174,260	$	74.83	539,671	$	53.64	100,560	$	38.36
Granted	139,194	75.13		138,421	120.42		265,547	75.23		5,112	69.56
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, 2024	440,017	$	63.54	312,681	$	95.01	598,606	$	63.19	101,897	$	39.16

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 rate	4.5	%

Expected lives of the PSUs	3 years
Expected volatility	32.2	%
Average expected volatility of comparable companies	48.3	%