BENEFIT PLANS (Components of Net Periodic Benefit Cost- Other Postretirement Benefits) (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of Net Periodic Benefit Cost
Service cost	$ 0.5	$ 0.6	$ 1.5	$ 1.7
Interest cost	0.5	0.3	1.5	0.7
Amortization of prior service cost (credit)	0.4	0.0	1.1	(0.2)
Amortization of actuarial gain	(0.4)	(0.3)	(1.2)	(1.0)
Net periodic benefit cost	1.0	0.6	2.9	1.2
Pretax reclassifications from AOCI included in net periodic postretirement benefit credit	$ 0.0	$ (0.3)	$ (0.1)	$ (1.2)