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Employee Benefit Plans 11 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Healthcare Cost Trend Rate      
Initial health care cost for employees under age of 65 (as a percent) 5.20%    
Ultimate health care cost for employees under age of 65 (as a percent) 4.30%    
Initial Health care cost for employees of age 65 and over (as a percent) 5.20%    
Ultimate health care cost for employees of age 65 and over (as a percent) 4.30%    
SERP      
Healthcare Cost Trend Rate      
Balance in Rabbi Trust $ 31.5    
Union plan      
Employee benefit plans      
Expected long-term return on plan assets 5.75% 6.00% 6.00%
Non-union plan      
Employee benefit plans      
Expected long-term return on plan assets 4.00% 4.20% 4.20%