RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7,467	$ 8,415	$ 8,573
Interest cost	32,559	33,868	34,725
Expected return on plan assets	(41,047)	(43,085)	(40,781)
Amortization of prior service cost (credit)	78	90	97
Amortization of actuarial losses (gains)	7,336	7,917	11,638
Special termination benefits	0	0	577
Curtailment gain	(1,346)	(244)	0
Net periodic benefit cost (credit)	5,047	6,961	14,829
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	13	27	50
Interest cost	428	644	745
Expected return on plan assets	0	0	0
Amortization of prior service cost (credit)	(59)	(20)	(948)
Amortization of actuarial losses (gains)	(781)	(361)	(617)
Special termination benefits	0	0	0
Curtailment gain	0	0	(1,103)
Net periodic benefit cost (credit)	$ (399)	$ 290	$ (1,873)