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EMPLOYEE BENEFITS - Summary of Changes in Plan Assets and Benefit Obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension and SERP    
Net Regulatory Assets [Abstract]    
Actuarial (Gain)/Loss Arising During the Year $ (49.2) $ 251.1
Actuarial (Loss)/Gain Reclassified as Net Periodic Benefit (Expense)/Income (79.1) (38.8)
Actuarial (Loss)/Gain Reclassified as Held for Sale (16.6) 0.0
Settlement Loss 0.0 0.0
Prior Service Cost/(Credit) Arising During the Year 1.3 0.0
Prior Service (Cost)/Credit Reclassified as Net Periodic Benefit (Expense)/Income (1.2) (1.2)
Prior Service Cost Reclassified as Held for Sale (1.2) 0.0
Actuarial Loss 956.1 1,101.0
Prior Service (Credit)/Cost 1.8 2.9
OCI    
Actuarial (Gain)/Loss Arising During the Year 2.3 14.0
Actuarial (Loss)/Gain Reclassified as Net Periodic Benefit (Expense)/Income (6.8) (7.0)
Actuarial (Loss)/Gain Reclassified as Held for Sale 0.0 0.0
Settlement Loss (4.3) (12.4)
Prior Service Cost/(Credit) Arising During the Year 0.0 0.0
Prior Service (Cost)/Credit Reclassified as Net Periodic Benefit (Expense)/Income (0.1) (0.1)
Prior Service Cost Reclassified as Held for Sale 0.0 0.0
Actuarial Loss 47.7 56.5
Prior Service Cost 0.2 0.3
PBOP    
Net Regulatory Assets [Abstract]    
Actuarial (Gain)/Loss Arising During the Year (50.9) (32.0)
Actuarial (Loss)/Gain Reclassified as Net Periodic Benefit (Expense)/Income 0.4 0.0
Actuarial (Loss)/Gain Reclassified as Held for Sale 7.1 0.0
Settlement Loss 0.0 0.0
Prior Service Cost/(Credit) Arising During the Year 0.0 (0.9)
Prior Service (Cost)/Credit Reclassified as Net Periodic Benefit (Expense)/Income 21.8 21.8
Prior Service Cost Reclassified as Held for Sale 0.6 0.0
Actuarial Loss 6.4 49.8
Prior Service (Credit)/Cost (66.2) (87.4)
OCI    
Actuarial (Gain)/Loss Arising During the Year (0.6) (0.3)
Actuarial (Loss)/Gain Reclassified as Net Periodic Benefit (Expense)/Income 0.0 0.0
Actuarial (Loss)/Gain Reclassified as Held for Sale 0.0 0.0
Settlement Loss 0.0 0.0
Prior Service Cost/(Credit) Arising During the Year 0.0 0.0
Prior Service (Cost)/Credit Reclassified as Net Periodic Benefit (Expense)/Income (0.2) (0.2)
Prior Service Cost Reclassified as Held for Sale 0.0 0.0
Actuarial Loss 1.8 2.4
Prior Service Cost $ 0.5 $ 0.7