Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 116.6	$ 35.6	$ 139.1
Changes in cumulative translation adjustment	53.4	(33.7)	18.3
Amortization of prior service cost	0.0	8.4	0.5
Amortization of actuarial net losses/(gains)	0.0	(0.2)	(2.1)
Actuarial net gains/(losses) arising during the year	0.9	(28.3)	(23.4)
Pension scheme settlement	0.0	138.1	0.0
Other comprehensive income, before tax	170.9	119.9	132.4
Tax related to cumulative translation adjustment	2.0	13.6	(2.4)
Tax related to other movements	0.0	(40.8)	6.2
Total comprehensive income	$ 172.9	$ 92.7	$ 136.2