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Compensation Plans (Restricted Stock Units) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized $ 8.3 $ 6.1 $ 6.3
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units issued 82,000 95,000 68,000
Vesting period of compensation expense not yet recognized 2 years 3 months 18 days    
Unrecognized compensation expense $ 7.1    
Restricted Stock Units (RSUs) [Member] | 2021 Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized 1.6    
Total compensation costs related to restricted stock units recognized ratably over the remaining periods required before the units vest $ 5.6    
Restricted Stock Units (RSUs) [Member] | 2021 Grants [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized 24 months    
Restricted Stock Units (RSUs) [Member] | 2021 Grants [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized 26 months    
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized   $ 1.1  
Total compensation costs related to restricted stock units recognized ratably over the remaining periods required before the units vest   $ 5.7  
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized   24 months  
Restricted Stock Units (RSUs) [Member] | 2020 Grants [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized   26 months  
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense recognized     $ 1.0
Total compensation costs related to restricted stock units recognized ratably over the remaining periods required before the units vest     $ 3.7
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized     24 months
Restricted Stock Units (RSUs) [Member] | 2019 Grants [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of compensation expense not yet recognized     26 months