Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Fair Value of Pension Assets (Details)

v3.25.0.1
BENEFIT PLANS - Fair Value of Pension Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 363.5  
Private Equity Commitments      
Defined Benefit Plan Disclosure [Line Items]      
Commitments related to investments $ 10.0 10.0  
Real Asset Commitments      
Defined Benefit Plan Disclosure [Line Items]      
Commitments related to investments 0.2 0.2  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 331.9 363.5 $ 399.0
Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 331.9    
U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   40.9  
International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   35.6  
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   243.3  
Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   13.8  
Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   4.8  
Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   25.1  
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 263.1    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | U.S. Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.2    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | International Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.3    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Fixed Income | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 193.0    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Private Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.3    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Real Assets | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.5    
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Cash | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.8    
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   25.1  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.8    
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Assets | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   25.1  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.8    
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   319.8  
Significant Other Observable Inputs (Level 2) | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 241.5    
Significant Other Observable Inputs (Level 2) | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   40.9  
Significant Other Observable Inputs (Level 2) | U.S. Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 34.2    
Significant Other Observable Inputs (Level 2) | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   35.6  
Significant Other Observable Inputs (Level 2) | International Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.3    
Significant Other Observable Inputs (Level 2) | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   243.3  
Significant Other Observable Inputs (Level 2) | Fixed Income | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 193.0    
Significant Other Observable Inputs (Level 2) | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Other Observable Inputs (Level 2) | Private Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Other Observable Inputs (Level 2) | Real Assets | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Other Observable Inputs (Level 2) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Other Observable Inputs (Level 2) | Cash | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   18.6  
Significant Unobservable Inputs (Level 3) | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.8    
Significant Unobservable Inputs (Level 3) | U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Unobservable Inputs (Level 3) | U.S. Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | International Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Unobservable Inputs (Level 3) | International Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.0  
Significant Unobservable Inputs (Level 3) | Fixed Income | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Significant Unobservable Inputs (Level 3) | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.3 13.8 13.1
Significant Unobservable Inputs (Level 3) | Private Equity | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.3    
Significant Unobservable Inputs (Level 3) | Real Assets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.5 4.8 $ 4.8
Significant Unobservable Inputs (Level 3) | Real Assets | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.5    
Significant Unobservable Inputs (Level 3) | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   $ 0.0  
Significant Unobservable Inputs (Level 3) | Cash | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0    
Investments measured at net asset value | Pension Benefits | Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 68.8