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)

v3.24.0.1
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, 2023
Dec. 31, 2022
Private Equity    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance $ 13.1 $ 16.1
Return on plan assets:    
Unrealized 0.7 1.0
Realized (0.3) (0.8)
Purchases 1.7 2.5
Sales (1.4) (5.7)
Ending balance 13.8 13.1
Hedge Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 0.0 0.1
Return on plan assets:    
Unrealized 0.0 (0.1)
Realized 0.0 0.0
Purchases 0.0 0.0
Sales 0.0 0.0
Ending balance 0.0 0.0
Real Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Roll Forward]    
Beginning balance 4.8 4.4
Return on plan assets:    
Unrealized 0.0 0.2
Realized 0.0 0.0
Purchases 0.0 0.2
Sales 0.0 0.0
Ending balance $ 4.8 $ 4.8