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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details)
Jun. 30, 2021
Jun. 30, 2020
Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Assets 71.00% 66.00%
Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Assets 21.00% 27.00%
Common-collective funds - Global asset allocation/risk parity    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Assets 7.00% 5.00%
Other    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of Plan Assets 1.00% 2.00%
Minimum | Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 65.00%  
Minimum | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 10.00%  
Minimum | Common-collective funds - Global asset allocation/risk parity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 0.00%  
Minimum | Other    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 0.00%  
Maximum | Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 85.00%  
Maximum | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 30.00%  
Maximum | Common-collective funds - Global asset allocation/risk parity    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 15.00%  
Maximum | Other    
Defined Benefit Plan Disclosure [Line Items]    
Target allocation for 2022 10.00%