BENEFIT PLANS (Components of Net Periodic Benefit Cost - Pension Benefits) (Details) - USD ($) $ in Millions	2 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2021	Oct. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31
Expected return on plan assets			4.00%
Pension Plans, Defined Benefit [Member]
Components of Net Periodic Benefit Cost
Service cost			$ 2.5	$ 4.0	$ 4.8
Interest cost			34.0	21.1	19.7
Expected return on plan assets			(27.6)	(30.1)	(42.8)
Settlement charge			(0.0)	(0.0)	12.1
Amortization of prior service cost			1.4	1.4	1.3
Amortization of actuarial loss			5.6	4.2	8.0
Net periodic benefit cost			15.9	0.6	3.1
Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net actuarial loss (gain)			(9.4)	11.2	(34.0)
Reclassification of prior service cost			(1.4)	(1.4)	(1.3)
Reclassification of actuarial loss			(5.6)	(4.2)	(20.1)
Amount recognized in other comprehensive income			(16.4)	5.6	(55.4)
Amount recognized in net periodic pension benefit cost and other comprehensive income			$ (0.5)	$ 6.2	$ (52.3)
Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31
Discount rate — PBO			5.19%	2.92%	2.63%
Discount rate — service cost	3.21%	2.94%	5.29%	3.17%
Discount rate — interest cost			5.09%	2.37%	1.90%
Expected return on plan assets	3.75%	5.25%	4.85%	4.00%
Weighted-average assumptions used to determine benefit obligation at December 31
Discount rate	2.91%		5.00%	5.19%	2.91%