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Employee Benefit Plans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Defined Contribution Plan, Cost $ 19,700,000 $ 18,300,000 $ 24,700,000
Trading securities fair value 101,300,000 $ 84,500,000  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 16,900,000    
Pension Plan [Member]      
Age for participation eligibility in benefit plan 21    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate 4.75% 4.00% 4.00%
Years of service for vesting eligibility 3 years    
Accumulated benefit obligation $ 323,200,000 $ 294,400,000  
Excess of pension plan assets over the projected benefit obligation $ 700,000 (15,300,000)  
Percentage of employees base salary matched by employer, maximum 3.00%    
Defined Benefit Plan Funding Goal Percentage 100.00%    
Defined Benefit Plan Funding Goal Percentage 100.00%    
Pension Plan [Member] | Fixed Income Funds [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 50.00%    
Pension Plan [Member] | US Equity [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 50.00%    
Other Postretirement Benefits Plan [Member]      
Fair value of assets $ 10,800,000 12,000,000  
Total obligation $ 8,700,000 $ 10,300,000