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Retirement Benefit Obligations - Components of Actuarial (Gains)/Losses Included in Other Comprehensive (Income)/Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Retirement Benefits [Abstract]      
Asset loss/(gain) $ 404 $ (914) $ 2,503
Demographic (gain)/loss (23) (160) (243)
Assumption (gain)/loss (299) 268 (2,798)
Total actuarial loss/(gain) $ 82 $ (806) $ (538)