Other income or expense, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2025	Sep. 30, 2026	Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]
Pension termination charges		$ 0.0	$ 18.1
United States | Pension plans
Defined Benefit Plan Disclosure [Line Items]
Pension termination, purchase of annuity contracts	$ 97.7
Pension termination charges			$ 16.3