BENEFIT PLANS - Components of Net Periodic Benefit Cost - Pension Benefits) (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0.7	$ 0.6
Interest cost	8.2	8.5
Expected return on plan assets	(7.1)	(6.9)
Amortization of prior service cost	0.3	0.4
Amortization of actuarial loss	1.2	1.4
Net periodic pension benefit cost	3.3	4.0
Pretax reclassifications from AOCI included in net periodic pension benefit cost	$ 1.5	$ 1.8