Other income or expense, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Other Income and Expenses [Abstract]
Net foreign currency (loss) gain from financing activities	$ (0.3)	$ 1.5	$ (0.4)	$ (5.6)
(Expense) income related to defined benefit plans	(0.5)	1.5	(1.6)	(16.3)
Other	0.0	0.7	0.1	2.4
Other (expense) income, net	$ (0.8)	$ 3.7	$ (1.9)	$ (19.5)