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Benefit Plans (Summary Of Performance Shares and Performance Units Vested Awards) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 66,322 90,806 99,438
Performance Units Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 20,131 31,910 37,395
2016 Grant [Member] | Performance Shares Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 66,322    
Vested percentage of the target 142.50%    
Cash and stock payout value $ 4.3    
Cash payout value $ 3.7    
Common stock shares from vested performance shares (in shares) 6,447    
2016 Grant [Member] | Performance Units Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards) 20,131    
Vested percentage of the target 142.50%    
Cash and stock payout value $ 1.3    
Cash payout value $ 1.3    
2015 Grant [Member] | Performance Shares Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   90,806  
Vested percentage of the target   137.50%  
Cash and stock payout value   $ 5.3  
Cash payout value   $ 4.9  
Common stock shares from vested performance shares (in shares)   5,078  
2015 Grant [Member] | Performance Units Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)   31,910  
Vested percentage of the target   137.50%  
Cash and stock payout value   $ 1.4  
Cash payout value   $ 1.4  
2014 Grant [Member] | Performance Shares Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     99,438
Vested percentage of the target     147.50%
Cash and stock payout value     $ 5.6
Cash payout value     $ 5.1
Common stock shares from vested performance shares (in shares)     5,185
2014 Grant [Member] | Performance Units Liability Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vested (in shares/awards)     37,395
Vested percentage of the target     147.50%
Cash and stock payout value     $ 1.5
Cash payout value     $ 1.5