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Retirement Plans - Components of Defined Benefit Pension and Post-retirement Benefit Plans (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in plan assets      
Company contributions $ 0 $ 2,000,000 $ 0
Pensions      
Change in projected benefit obligation      
Beginning balance 35,500,000 32,800,000  
Service cost 1,200,000 1,100,000 1,500,000
Interest cost 1,700,000 1,600,000 1,200,000
Actuarial loss (gain) (3,400,000) 1,000,000.0  
Plan amendments 0 300,000  
Benefit payments (1,500,000) (1,300,000)  
Ending balance 33,500,000 35,500,000 32,800,000
Change in plan assets      
Beginning balance, fair value of plan asset 26,600,000 23,100,000  
Actual return on plan assets 600,000 2,600,000  
Company contributions 300,000 2,200,000  
Benefit payments (1,500,000) (1,300,000)  
Ending balance, fair value of plan asset 26,000,000.0 26,600,000 23,100,000
Net Funded Status of the Plan (Liability) (7,500,000) (8,900,000)  
Pension and other postretirement benefit asset 0 0  
Pension and other postretirement benefit (liability) (7,500,000) (8,900,000)  
Other Benefits      
Change in projected benefit obligation      
Beginning balance 700,000 700,000  
Service cost 0 0 0
Interest cost 0 0 0
Actuarial loss (gain) 0 100,000  
Plan amendments 0 0  
Benefit payments 0 (100,000)  
Ending balance 700,000 700,000 700,000
Change in plan assets      
Beginning balance, fair value of plan asset 0 0  
Actual return on plan assets 0 0  
Company contributions 0 0  
Benefit payments 0 0  
Ending balance, fair value of plan asset 0 0 $ 0
Net Funded Status of the Plan (Liability) (700,000) (700,000)  
Pension and other postretirement benefit asset 0 0  
Pension and other postretirement benefit (liability) $ (700,000) $ (700,000)  
Qualified Plan | Pensions      
Defined Benefit Plan Disclosure      
Discount rate 5.50% 4.80%  
Qualified Plan | Other Benefits      
Defined Benefit Plan Disclosure      
Discount rate 0.00% 0.00%  
Nonqualified Plan | Pensions      
Defined Benefit Plan Disclosure      
Discount rate 5.45% 4.80%  
Nonqualified Plan | Other Benefits      
Defined Benefit Plan Disclosure      
Discount rate 5.35% 4.70%