Retirement Benefits (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Pension Benefit Cost (Credit)
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,582	$ 1,944
Interest cost	7,681	8,119
Expected return on plan assets	(10,409)	(10,257)
Amortization of prior service (credit) cost	(13)	8
Amortization of actuarial losses (gains)	1,782	1,893
Net periodic benefit (credit) cost	623	1,707
Other Postretirement Benefit Credit
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	92	151
Amortization of prior service (credit) cost	(16)	(15)
Amortization of actuarial losses (gains)	(157)	(86)
Net periodic benefit (credit) cost	$ (78)	$ 54