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Post-retirement benefit plans - Schedule of allocation of plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Nov. 01, 2021
--- | --- | ---
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Total plan assets | $ 140,152 | $ 0
Equity securities |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Total plan assets | 21,352 |
Debt securities |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Total plan assets | 47,074 |
Other |  |
Defined Benefit Plan, Plan Assets, Allocation [Line Items] |  |
Total plan assets | $ 71,726 |

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