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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 3.1 $ 4.1 $ 4.7
Interest cost 19.6 14.1 14.2
Expected return on plan assets (25.5) (22.4) (26.9)
Amortization of prior service cost (0.1) 0.0 0.0
Mark-to-market actuarial net (gains) losses (2.8) 31.4 11.9
Other 0.0 0.0 (0.6)
Net periodic (income) cost (5.7) 27.2 3.3
Health Care Benefits      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 0.0 0.0 0.1
Interest cost 0.3 0.4 0.5
Expected return on plan assets 0.0 0.0 0.0
Amortization of prior service cost (6.3) 0.0 0.0
Mark-to-market actuarial net (gains) losses (1.0) (2.9) (1.6)
Other 0.0 0.0 (0.3)
Net periodic (income) cost $ (7.0) $ (2.4) $ (1.3)