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EMPLOYEE BENEFIT PLANS - Schedule of Components of Net Period Benefit Cost or Gain (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 2.7 $ 3.1 $ 4.1
Interest cost 18.2 19.6 14.1
Expected return on plan assets (24.1) (25.5) (22.4)
Amortization of prior service cost (0.1) (0.1) 0.0
Mark-to-market actuarial net (gains) losses (2.9) (2.8) 31.4
Net periodic (income) cost (6.2) (5.7) 27.2
Health Care Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0.0 0.0 0.0
Interest cost 0.2 0.3 0.4
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost 0.0 (6.3) 0.0
Mark-to-market actuarial net (gains) losses (0.7) (1.0) (2.9)
Net periodic (income) cost $ (0.5) $ (7.0) $ (2.4)