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
	Mar. 31, 2022	Mar. 31, 2021
Components of Net Periodic Benefit Cost
Service cost	$ 0.6	$ 0.3
Interest cost	0.2	0.1
Amortization of prior service credit	(0.1)	(0.5)
Amortization of actuarial gain	(0.3)	(0.4)
Net periodic benefit cost (credit)	0.4	(0.5)
Pretax reclassifications from AOCI included in net periodic postretirement benefit credit	$ (0.4)	$ (0.9)