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BENEFIT PLANS - Combined Funded Status of Plans and their Reconciliation with Related Amounts Recognized in Consolidated Financial Statements - Pension Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plans, Defined Benefit      
Change in Benefit Obligation      
Projected benefit obligation at beginning of year $ 693.3 $ 691.1  
Service cost 2.3 2.5 $ 4.0
Interest cost 32.9 34.0 21.1
Actuarial (gain) loss (40.2) 12.4  
Benefits paid (47.5) (46.7)  
Projected benefit obligation at end of year 640.8 693.3 691.1
Change in Fair Value of Plan Assets      
Fair value of assets at beginning of year 647.9 637.8  
Actual return on plan assets (2.0) 49.4  
Employer contribution 8.7 7.4 7.8
Benefits paid (47.5) (46.7)  
Fair value of assets at end of year 607.1 647.9 637.8
Funded status (33.7) (45.4)  
Amounts Recognized in the Consolidated Balance Sheets      
Noncurrent assets 8.1 6.5  
Current liabilities (4.1) (7.3)  
Noncurrent liabilities (37.7) (44.6)  
Net amount recognized (33.7) (45.4)  
Amounts Recognized in Accumulated Other Comprehensive Income      
Net actuarial loss 153.1 168.4  
Prior service cost 0.0 1.0  
Total amount recognized 153.1 169.4  
Other Postretirement Benefit Plans, Defined Benefit      
Change in Benefit Obligation      
Projected benefit obligation at beginning of year 44.2 41.8  
Service cost 2.2 2.0 2.2
Interest cost 2.2 2.0 0.9
Actuarial (gain) loss (3.0) 3.6  
Benefits paid (3.4) (5.2)  
Projected benefit obligation at end of year 42.2 44.2 41.8
Change in Fair Value of Plan Assets      
Fair value of assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contribution 3.4 5.2 4.9
Fair value of assets at end of year 0.0 0.0 $ 0.0
Funded status (42.2) (44.2)  
Amounts Recognized in the Consolidated Balance Sheets      
Current liabilities (4.7) (5.2)  
Noncurrent liabilities (37.5) (39.0)  
Net amount recognized (42.2) (44.2)  
Amounts Recognized in Accumulated Other Comprehensive Income      
Net actuarial loss (15.0) (12.7)  
Prior service cost 10.2 11.7  
Total amount recognized $ (4.8) $ (1.0)