Annual report [Section 13 and 15(d), not S-K Item 405]

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

v3.25.4
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, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance $ 263.1  
Return on plan assets:    
Ending balance   $ 263.1
Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 17.8  
Return on plan assets:    
Ending balance   17.8
Private Equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 13.3  
Return on plan assets:    
Unrealized 0.0 0.0
Realized 1.1 0.4
Purchases 0.1 0.5
Sales (2.0) (1.4)
Ending balance   13.3
Private Equity | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 13.3 13.8
Return on plan assets:    
Ending balance 12.5 13.3
Real Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 4.5  
Return on plan assets:    
Unrealized (0.6) (0.1)
Realized (0.4) 0.1
Purchases 0.1 0.0
Sales (0.2) (0.3)
Ending balance   4.5
Real Assets | Significant Unobservable Inputs (Level 3)    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 4.5 4.8
Return on plan assets:    
Ending balance $ 3.4 $ 4.5