Retirement Benefits - Schedule of Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Pension Benefit Cost (Credit)
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,686	$ 1,990	$ 5,598	$ 6,319
Interest cost	8,104	8,592	24,400	25,413
Expected return on plan assets	(10,273)	(10,772)	(30,786)	(32,314)
Amortization of prior service cost	46	22	59	68
Amortization of actuarial losses (gains)	1,726	2,232	5,502	5,937
Net periodic benefit (credit) cost	1,289	2,064	4,773	5,423
Other Postretirement Benefit Credit
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	8	10	22
Interest cost	20	151	322	483
Amortization of prior service cost	(16)	(5)	(45)	(15)
Amortization of actuarial losses (gains)	(414)	(102)	(586)	(270)
Net periodic benefit (credit) cost	$ (410)	$ 52	$ (299)	$ 220