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EMPLOYEE BENEFIT PLANS - Change in Benefit Obligation, Change in Plan Assets and Components of Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Change in benefit obligation:      
Projected benefit obligation - beginning of year $ 549.3 $ 602.0  
Service Cost 4.1 4.7 $ 3.0
Interest Cost 14.1 14.2 15.3
Actuarial gain (80.8) (12.1)  
Benefits paid (47.1) (53.9)  
Other (5.8) (5.6)  
Projected benefit obligation - end of year 433.8 549.3 602.0
Projected salary increases (6.3) (7.7)  
Accumulated benefit obligation 427.5 541.6  
Change in plan assets:      
Plan assets - beginning of year 529.3 573.6  
Actual return on plan assets (89.9) 2.9  
Company contributions 6.3 8.6  
Benefits paid (47.0) (53.9)  
Other (2.1) (1.9)  
Plan assets - end of year 396.6 529.3 573.6
Unfunded status at end of year (37.2) (20.0)  
Health Care Benefits      
Change in benefit obligation:      
Projected benefit obligation - beginning of year 15.8 18.3  
Service Cost 0.0 0.1 0.1
Interest Cost 0.4 0.5 0.4
Actuarial gain (2.9) (1.6)  
Benefits paid (1.0) (1.2)  
Other (6.5) (0.3)  
Projected benefit obligation - end of year 5.9 15.8 18.3
Projected salary increases 0.0 0.0  
Accumulated benefit obligation 5.9 15.8  
Change in plan assets:      
Plan assets - beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Company contributions 1.0 1.2  
Benefits paid (1.0) (1.2)  
Other 0.0 0.0  
Plan assets - end of year 0.0 0.0 $ 0.0
Unfunded status at end of year $ (5.9) $ (15.8)