Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs (Details)

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BENEFIT PLANS - Reconciliation of Beginning and Ending Balances for Plan Assets Valued using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance $ 363.5  
Return on plan assets:    
Ending balance   $ 363.5
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 18.6  
Return on plan assets:    
Ending balance   18.6
Private Equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 13.8  
Return on plan assets:    
Unrealized 0.0 0.7
Realized 0.4 (0.3)
Purchases 0.5 1.7
Sales (1.4) (1.4)
Ending balance   13.8
Private Equity | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 13.8 13.1
Return on plan assets:    
Ending balance 13.3 13.8
Real Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 4.8  
Return on plan assets:    
Unrealized (0.1) 0.0
Realized 0.1 0.0
Purchases 0.0 0.0
Sales (0.3) 0.0
Ending balance   4.8
Real Assets | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 4.8 4.8
Return on plan assets:    
Ending balance $ 4.5 $ 4.8