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Derivatives (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 01, 2022
Mar. 01, 2019
Derivatives, Fair Value [Line Items]        
Net broker receivables $ 0.9 $ 2.2    
Margin deposit assets 0.8 3.1    
Increase (decrease) in variation margin deposits outstanding 0.1 $ (0.9)    
Fair value of embedded derivative liability $ 51.5      
Class A Convertible Preferred Units        
Derivatives, Fair Value [Line Items]        
Basis spread       2
Class A Convertible Preferred Units | Scenario, Forecast        
Derivatives, Fair Value [Line Items]        
Reset rate     10.75%  
Percentage below issue price     110.00%  
Class A Convertible Preferred Units | LIBOR | Scenario, Forecast        
Derivatives, Fair Value [Line Items]        
Basis spread     7.50