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EMPLOYEE BENEFIT PLANS - Schedule of Change in Benefit Obligation, Change in Plan Assets and Components of Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation - beginning of year $ 423.8 $ 433.8  
Service cost 2.7 3.1 $ 4.1
Interest cost 18.2 19.6 14.1
Actuarial (gain) / loss (9.1) 9.2  
Benefits paid (39.1) (44.8)  
Other (4.8) 2.9  
Projected benefit obligation - end of year 391.7 423.8 433.8
Projected salary increases (5.5) (6.5)  
Accumulated benefit obligation 386.2 417.3  
Change in plan assets:      
Plan assets - beginning of year 400.5 396.6  
Actual return on plan assets 17.9 37.7  
Company contributions 7.0 9.1  
Benefits paid (39.1) (44.8)  
Other 0.2 1.9  
Plan assets - end of year 386.5 400.5 396.6
Unfunded status at end of year (5.2) (23.3)  
Health Care Benefits      
Change in benefit obligation:      
Projected benefit obligation - beginning of year 4.4 5.9  
Service cost 0.0 0.0 0.0
Interest cost 0.2 0.3 0.4
Actuarial (gain) / loss (0.7) (1.0)  
Benefits paid (0.4) (0.9)  
Other (0.1) 0.1  
Projected benefit obligation - end of year 3.4 4.4 5.9
Projected salary increases 0.0 0.0  
Accumulated benefit obligation 3.4 4.4  
Change in plan assets:      
Plan assets - beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Company contributions 0.4 0.9  
Benefits paid (0.4) (0.9)  
Other 0.0 0.0  
Plan assets - end of year 0.0 0.0 $ 0.0
Unfunded status at end of year $ (3.4) $ (4.4)