Employee Benefits - Schedule of changes in net liability for defined benefit plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in pension benefit obligations:
Balance at beginning of year	$ (142.3)	$ (135.6)
Service cost	(0.1)	(0.2)	$ (0.5)
Interest cost	(5.7)	(5.7)	(3.4)
Actuarial gain (loss)	12.8	(1.1)
Benefits paid	8.5	7.8
Foreign exchange movement	2.3	(7.5)
Balance at end of year	(124.5)	(142.3)	(135.6)
Change in pension plan assets:
Balance at beginning of year	144.8	138.4
Actual return on plan assets	(7.9)	6.4
Benefits paid	(8.5)	(7.8)
Foreign exchange movement	(2.1)	7.8
Balance at end of year	126.3	144.8	$ 138.4
Net asset	$ 1.8	$ 2.5