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Employee Benefit Plans - Postretirement Benefit Plans (Details) - Postretirement Plans - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Estimated future benefit payments, net of subsidies:      
2025 $ 3,400,000    
2026 3,100,000    
2027 2,800,000    
2028 2,500,000    
2029 2,300,000    
Subsequent five years 13,300,000    
Change in projected benefit obligation:      
Projected benefit obligation — beginning of year 29,700,000 $ 32,100,000  
Interest cost 1,200,000 1,400,000 $ 1,100,000
Actuarial losses 100,000 200,000  
Benefits paid (4,000,000.0) (4,000,000.0)  
Projected benefit obligation — end of year 27,000,000.0 29,700,000 32,100,000
Funded status at year-end (27,000,000.0) (29,700,000)  
Other assets 0    
Accrued expenses 3,300,000 3,600,000  
Other long-term liabilities 23,700,000 26,100,000  
Net amount recognized (27,000,000.0) (29,700,000)  
Amount recognized in accumulated other comprehensive income (pre-tax) consists of — net prior service costs (4,100,000) (7,200,000)  
Defined Benefit Plan, Net Periodic Benefit Cost      
Service cost 0 0 0
Interest cost 1,200,000 1,400,000 1,100,000
Amortization of unrecognized prior service credits (3,100,000) (3,900,000) (4,400,000)
Settlement loss 0 0 700,000
Recognized net actuarial (gains) losses 100,000 200,000 (7,000,000.0)
Total net periodic pension benefit expense $ (1,800,000) $ (2,300,000) $ (9,600,000)
Assumptions - Actuarial assumptions used in accounting for plans      
Health care cost trend rate for next year 6.50% 6.75% 7.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 5.00% 5.00% 5.00%
Year that the rate reaches the ultimate trend rate 2031 2031 2031
Discount rate used in determining net periodic postretirement benefit expense 5.16% 5.50% 2.84%
Discount rate used in determining year-end postretirement benefit obligation 5.48% 5.16% 5.50%