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Post-retirement benefit plans - Narrative (Details) - USD ($)
$ in Thousands
 2 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 01, 2021
Defined Benefit Plan, Plan Assets, Allocation [Line Items]          
Actuarial gain in AOCI, net of tax   $ 9,285 $ (2,684) $ (1,845)  
Weighted average discount rate used calculating benefit obligation (in percentage) 1.30% 1.30%      
Liability, unfunded status of plan $ 48,545 $ 48,545     $ 0
Actuarial gain on pension plan, net of tax $ 5,100        
Weighted average discount rate used calculating benefit obligation for pension plans (in percentage) 1.30% 1.30%      
Defined benefit plan, pension plan, benefit obligation $ 48,500 $ 48,500      
Accumulated benefit obligation 166,400 166,400      
Expected future employer contributions within the next fiscal year 4,600 4,600      
GECAS Plan          
Defined Benefit Plan, Plan Assets, Allocation [Line Items]          
Liability, unfunded status of plan $ 63,400 $ 63,400