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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