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Employee Benefit Plans - Allocation of plan assets (Details)
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Target allocation 100.00%  
Percentage of plan assets at end of period 100.00% 100.00%
US equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation 15.00%  
Percentage of plan assets at end of period 15.00% 16.00%
Non-US equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation 30.00%  
Percentage of plan assets at end of period 35.00% 39.00%
Fixed-income securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation 50.00%  
Percentage of plan assets at end of period 49.00% 44.00%
Other    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation 5.00%  
Percentage of plan assets at end of period 1.00% 1.00%