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Share Based Compensation (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2020
Jan. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense (benefit)     $ 0.2 $ 0.7 $ (0.5) $ 1.9
Cash payments distributed related to awards previously granted and now payable   $ 2.0        
Awards forfeited during period, value     $ 0.0 $ 0.0 $ 0.0 $ 0.0
Awards forfeited during period, units     0 0 0 0
Outstanding awards vested during period         $ 3.5  
Director Incentive Agreement [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted during period (in units)         5,048  
Award vesting period         3 years  
2006 Performance Unit Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted during period (in units)         0  
Common stock to be issued with plan     0   0  
2020 Performance Unit Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense (benefit)     $ 0.6   $ 0.6  
Common stock to be issued with plan     0   0  
2020 Performance Unit Plan [Member] | Performance Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted during period (in units) 9,822          
2020 Performance Unit Plan [Member] | Performance Units [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards to be granted as percentage of target units 200.00%          
2020 Performance Unit Plan [Member] | Performance Units [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards to be granted as percentage of target units 0.00%          
2020 Performance Unit Plan [Member] | Restricted Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards granted during period (in units) 9,822          
Award vesting period         3 years