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Benefit Plans - Assumptions Used (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension benefits      
Weighted average assumptions used in net periodic benefit cost:      
Discount rate 4.35% 2.48% 2.29%
Rate of compensation increase 3.09% 2.79% 2.41%
Expected long-term rate of return on assets 4.22% 4.14% 4.93%
Weighted average assumptions used in benefit obligations:      
Discount rate 3.95% 4.35%  
Rate of compensation increase 3.08% 3.09%  
Other retirement benefits      
Weighted average assumptions used in net periodic benefit cost:      
Discount rate 5.55% 2.75% 2.30%
Rate of compensation increase 0.00% 0.00% 0.00%
Expected long-term rate of return on assets 0.00% 0.00% 0.00%
Weighted average assumptions used in benefit obligations:      
Discount rate 5.20% 5.55%  
Rate of compensation increase 0.00% 0.00%