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PENSION PLANS AND RETIREMENT BENEFITS (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Qualified Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 0.8 $ 1.5
Pension Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 1.2 $ 1.4 2.5 2.8
Interest cost 25.5 26.4 50.6 52.7
Expected return on plans’ assets (33.8) (32.7) (67.7) (65.6)
Amortization of prior service cost (0.2) (0.1) (0.3) (0.2)
Recognized actuarial loss 1.8 0.3 3.3 0.6
Net periodic benefit (income) cost (5.5) (4.7) (11.6) (9.7)
Other Postretirement Benefits        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost 0.2 0.2 0.4 0.4
Interest cost 0.5 0.4 0.9 0.9
Expected return on plans’ assets 0.0 0.0 0.0 0.0
Amortization of prior service cost 0.0 0.1 0.0 0.1
Recognized actuarial loss 0.3 0.2 0.5 0.4
Net periodic benefit (income) cost $ 1.0 $ 0.9 $ 1.8 $ 1.8