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Fair Value Measurements (FY) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 1991
Dec. 31, 2018
Apr. 18, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Abstract]            
Redemption amount of senior redeemable preferred stock           $ 2.1
Preferred stock dividend rate per annum     12.00%      
Public Preferred Stock [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Abstract]            
Preferred stock dividend rate per annum 12.00% 12.00%   6.00%    
Public preferred stock par value (in dollar per share) $ 0.01 $ 0.01        
Carrying value of public preferred stock   $ 139.2     $ 135.4  
Estimate of Fair Value, Fair Value Disclosure [Member] | Public Preferred Stock [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Abstract]            
Public preferred stock $ 68.5 $ 60.5     $ 41.4