RETIREMENT BENEFITS - Actuarial Assumptions Used In Defined Benefit Pension Plans (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2019
Weighted average assumptions used to determine benefit obligations as of end of period:
Discount rate	2.57%	2.71%	2.89%	3.11%
Pension Plan
Weighted average assumptions used to determine benefit obligations as of end of period:
Discount rate	2.57%	2.71%	2.89%	3.11%
Weighted average assumptions used to determine net periodic pension cost for the period:
Discount rate	2.71%	3.11%	2.57%	4.17%
Expected long-term return on plan assets	6.50%	6.50%	6.20%	7.00%
Cash balance interest credit rate	4.33%	4.33%	3.32%	4.49%