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Employee Benefit Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Contribution Plan, Cost $ 24.7 $ 27.7 $ 23.6
Trading securities fair value 98.6 $ 82.6  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year $ 0.0    
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 4.00% 4.00% 4.00%
Years of service for vesting eligibility 3 years    
Accumulated benefit obligation $ 358.7 $ 350.3  
Excess of pension plan assets over the projected benefit obligation $ 16.3 7.9  
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] | Minimum [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 15.00%    
Pension Plan [Member] | US Equity [Member] | Maximum [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 45.00%    
Pension Plan [Member] | Foreign equity [Member] | Minimum [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 10.00%    
Pension Plan [Member] | Foreign equity [Member] | Maximum [Member]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 30.00%    
Other Postretirement Benefits Plan [Member]      
Fair value of assets $ 16.6 19.0  
Total obligation $ 13.5 $ 15.7