RETIREMENT BENEFITS - Actuarial Assumptions (Details) - Pension Plans, Defined Benefit	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension, Postretirement And Postemployment Liabilities Statement [Line Items]
Discount rate	3.40%	4.00%
Rate of compensation increase	1.40%	1.20%
Interest crediting rate	2.50%	2.50%
Discount rate	4.00%	1.60%	1.20%
Expected long-term return on plan assets	4.10%	3.60%	3.60%
Rate of compensation increase	1.20%	1.00%	1.30%
Interest crediting rate	2.50%	2.10%	2.20%