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Derivatives (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 01, 2022
Dec. 31, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Net broker receivable   $ 7.8   $ 0.9
Initial margin   6.8   $ 0.8
Increase in margin deposits outstanding $ 0.1 1.0    
Derivatives, Fair Value [Line Items]        
Embedded derivative liability   $ 40.8    
Forecast | Class A Convertible Preferred Stock Units        
Derivatives, Fair Value [Line Items]        
Stock reset rate percentage     10.75%  
Percentage below issue price per share     110.00%  
LIBOR | Forecast | Class A Convertible Preferred Stock Units        
Derivatives, Fair Value [Line Items]        
Basis spread on variable rate over stock price     0.0750