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Retirement Plans and Profit Sharing Arrangements - Weighted Average Assumptions (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plans      
Weighted average assumptions used to determine benefit obligations      
Discount rates 4.98% 5.30%  
Rates of increase in compensation levels 3.64% 3.72%  
Interest crediting rates for cash balance plans 5.00% 5.00%  
Weighted average assumptions used to determine net periodic benefit cost      
Discount rates 5.30% 2.46% 2.33%
Rates of increase in compensation levels 3.72% 3.69% 5.21%
Expected long term rates of return on assets 6.04% 4.82% 6.58%
Interest crediting rates for cash balance plans 5.00% 5.00% 5.00%
Other Postretirement Plans      
Weighted average assumptions used to determine benefit obligations      
Discount rates 5.07% 5.41%