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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension        
Components of Net Periodic Benefit Cost (Credit)        
Service Cost $ 1.6 $ 1.7 $ 4.9 $ 4.9
Interest Cost 9.7 10.2 29.0 30.4
Expected Return on Plan Assets (11.2) (10.9) (33.6) (32.8)
Amortization of Prior Service Credits (0.1) (0.1) (0.1) (0.1)
Amortization of Net Loss (Gain) 1.7 1.4 4.9 4.3
Net Periodic Benefit Cost (Credit) 1.7 2.3 5.1 6.7
Other Postretirement        
Components of Net Periodic Benefit Cost (Credit)        
Service Cost 0.3 0.6 1.1 1.7
Interest Cost 1.0 1.6 2.9 4.6
Expected Return on Plan Assets (2.7) (2.9) (8.3) (8.5)
Amortization of Prior Service Credits (2.9) (1.8) (8.7) (5.3)
Amortization of Net Loss (Gain) (0.8) (0.6) (2.4) (1.7)
Net Periodic Benefit Cost (Credit) $ (5.1) $ (3.1) $ (15.4) $ (9.2)