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Share Based Compensation (Details) - Performance Units [Member] - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense   $ 0.9 $ 0.3 $ 2.8 $ 1.3
Cash payments distributed related to awards previously granted and now payable $ 1.5        
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       $ 6.2  
Director Incentive Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted during period (in units)       5,175  
Award vesting period       3 years  
Performance Unit Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards granted during period (in units)       17,022  
Award vesting period       5 years