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Post-retirement benefit plans - Schedule of pension plan benefit (Details) $ in Thousands	2 Months Ended
	Dec. 31, 2021 USD ($)
Retirement Benefits [Abstract]
Service cost for benefits earned	$ 1,258
Expected return on plan assets	(856)
Interest cost on benefit obligations	352
Curtailment gain (a)	(7,951)
Pension plan cost (benefit)	$ (7,197)

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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