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Pensions and other postretirement benefit plans - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Pension benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 0.6
Postretirement benefits
Defined Benefit Plan Disclosure
Contribution to the defined benefit plans	$ 2.2

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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