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Retirement Benefit Plans - Summary of Components of Accumulated Other Comprehensive Loss Related to Pensions and Postretirement Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Transition obligation $ 0 $ 0
Net actuarial loss (gain) 25,686 34,440
Deferred tax (benefit) expense (4,120) (6,488)
Net amount recorded in (AOCL) 21,566 27,952
SERP    
Defined Benefit Plan Disclosure [Line Items]    
Transition obligation 104 0
Net actuarial loss (gain) 207 (44)
Deferred tax (benefit) expense (50) 8
Net amount recorded in (AOCL) 261 (36)
OPEB    
Defined Benefit Plan Disclosure [Line Items]    
Transition obligation 0 0
Net actuarial loss (gain) (1,613) (1,788)
Deferred tax (benefit) expense 258 337
Net amount recorded in (AOCL) $ (1,355) $ (1,451)