Stock-based compensation (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of components of stock-based compensation expense

The following table presents the components of stock-based compensation expense:

(in millions)	Classification	Three months ended March 31,
		2026		2025
Stock options	Equity	$	1.5	$	2.4
RSUs	Equity	7.3		10.3
Other	Both	(0.2)		(0.3)
Total		$	8.6	$	12.4
Award classification:
Equity		$	9.0	$	13.0
Liability		(0.4)		(0.6)

Schedule of information about outstanding stock options

The following table presents information about outstanding stock options:

(options and intrinsic value in millions)	Number of options	Weighted average exercise price per option		Aggregate intrinsic value		Weighted average remaining term
Balance at December 31, 2025	11.7	$	21.18
Granted	6.1	10.88
Exercised	—	—
Forfeited	(2.0)	14.90
Balance at March 31, 2026	15.8	$	17.92	$	—	6.2 years
Expected to vest	6.8	11.92		—		9.7 years
Vested	9.0	22.35		—		3.6 years

Schedule of information about unvested RSUs

The following table presents information about unvested RSUs:

(awards in millions)	Number of awards	Weighted average grant date fair value per award
Balance at December 31, 2025	6.7	$	17.88
Granted	5.0	9.19
Vested	(1.1)	22.21
Forfeited	(0.9)	15.37
Balance at March 31, 2026	9.7	$	12.51