PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Qualified Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0.3	$ 0.8
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	1.3	1.4
Interest cost	25.1	26.3
Expected return on plans’ assets	(33.9)	(32.9)
Amortization of prior service cost	(0.1)	(0.1)
Recognized actuarial loss	1.5	0.3
Net periodic benefit (income) cost	(6.1)	(5.0)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.2	0.2
Interest cost	0.4	0.5
Expected return on plans’ assets	0.0	0.0
Amortization of prior service cost	0.0	0.0
Recognized actuarial loss	0.2	0.2
Net periodic benefit (income) cost	$ 0.8	$ 0.9