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Postretirement Benefits - Actuarial Assumptions (Details)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 01, 2024
Jun. 01, 2024
Jan. 01, 2024
Employee Pension Plan            
Actuarial assumptions used to determine benefit obligations:            
Discount rate 5.87% 5.34%        
Rate of compensation increase 5.01% 3.25%   5.12% 5.53% 5.11%
Actuarial assumptions used to determine net periodic benefit costs:            
Discount rate 5.34% 5.67% 3.16%      
Expected return on assets 7.00% 6.50% 5.50%      
Rate of compensation increase 4.31% 3.30% 3.21%      
Supplemental Employee Retirement Plan (SERP)            
Actuarial assumptions used to determine benefit obligations:            
Discount rate 5.65% 5.11%        
Rate of compensation increase 7.00% 5.00%        
Actuarial assumptions used to determine net periodic benefit costs:            
Discount rate 5.12% 5.46% 3.11%      
Rate of compensation increase 5.00% 5.00% 5.00%