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Compensation Plans: Stock Based (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 03, 2022
Jun. 30, 2022
USD ($)
shares
Aug. 03, 2022
USD ($)
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2021
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award              
Shares available for grant   4,900,000   4,900,000   4,900,000  
Performance Shares (PSUs)              
Share-based Compensation Arrangement by Share-based Payment Award              
Award Vesting Period   3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Multiplier Assumed, 2019 PSU TSR Cap   1   1   1  
Stock-based compensation expense | $       $ 0.7 $ 1.3 $ 1.4 $ 4.5
Unrecognized stock based compensation expense | $   $ 0.0   $ 0.0   $ 0.0  
Performance Shares (PSUs) | Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award              
Award Vesting Period 3 years            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     276,010        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $     $ 7.4        
Performance Shares (PSUs) | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award              
Multiplier applied to PSU awards at settlement   0   0   0  
Performance Shares (PSUs) | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award              
Multiplier applied to PSU awards at settlement   2   2   2  
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award              
Stock-based compensation expense | $       $ 3.2 $ 2.1 $ 6.5 $ 4.3
Unrecognized stock based compensation expense | $   $ 13.7   $ 13.7   $ 13.7  
Number of shares represented by each RSU   1   1   1  
Restricted Stock Units (RSUs) | Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award              
Award Vesting Period 3 years            
Shares Withheld for Tax Withholding Obligation     283,800        
Shares Issued in Period     634,575        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     526,776        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Total Fair Value | $     $ 18.0