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Pension Benefits (Target And Actual Asset Allocations) (Details) - Defined Benefit Pension Plans [Member]
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Actual Percentage of Plan Assets 100.00% 100.00%
Cash And Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual Percentage of Plan Assets 5.00% 3.00%
Cash And Equivalents [Member] | Minimum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 0.00%  
Cash And Equivalents [Member] | Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 10.00%  
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual Percentage of Plan Assets 51.00% 49.00%
Equity Securities [Member] | Minimum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 30.00%  
Equity Securities [Member] | Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 70.00%  
Fixed Income [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Actual Percentage of Plan Assets 44.00% 48.00%
Fixed Income [Member] | Minimum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 30.00%  
Fixed Income [Member] | Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Target Percentage of Plan Assets 70.00%