v3.25.4
Pension Benefits - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]            
Defined contribution plan, cost       $ 24,500,000 $ 24,300,000 $ 27,500,000
Pension Plans            
Defined Benefit Plan Disclosure [Line Items]            
Settlement of asset retirement obligations       70,200,000    
Settlement of asset retirement obligations       55,500,000    
Settlement adjustment   $ 2,600,000        
Reversion of assets     $ 4,700,000      
Corporate use $ 13,100,000     13,100,000    
Reversion of assets, expenses 7,300,000          
Excise tax 2,600,000     2,600,000    
Assets for plan benefits     0   0  
Unfunded liability 0   0 0 0  
Pension expense       0 (2,600,000) 71,100,000
Unrecognized pension gain (loss) arising during the year       0 0 0
Supplemental Employee Retirement Plan            
Defined Benefit Plan Disclosure [Line Items]            
Unfunded liability $ 20,300,000   $ 20,100,000 20,300,000 20,100,000  
Pension expense       1,000,000.0 1,000,000.0 1,000,000.0
Unrecognized pension gain (loss) arising during the year       $ (1,100,000) $ 800,000 $ (700,000)