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PENSION PLANS AND RETIREMENT BENEFITS (Details 2) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Pension Benefits        
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        
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