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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Benefits    
Components of Net Periodic Benefit Cost (Credit):    
Service cost $ 0.9 $ 1.0
Interest cost 2.4 2.5
Expected return on plan assets (3.8) (3.7)
Amortization of net loss (gain) 0.1 0.3
Net periodic benefit cost (credit) (0.4) 0.1
Post-retirement benefits    
Components of Net Periodic Benefit Cost (Credit):    
Service cost 0.1 0.1
Interest cost 0.3 0.2
Amortization of net loss (gain) (0.2) (0.5)
Amortization of prior service credit (0.9) (0.9)
Net periodic benefit cost (credit) $ (0.7) $ (1.1)