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Derivatives (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 01, 2022
Mar. 31, 2018
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Net broker receivable $ 1.0   $ 1.9
Initial margin 1.3   1.9
(Decrease) increase in margin deposits outstanding $ (0.3)    
Derivatives, Fair Value [Line Items]      
Embedded derivative liability     $ 48.1
Scenario, 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 | Scenario, Forecast | Class A Convertible Preferred Stock Units      
Derivatives, Fair Value [Line Items]      
Basis spread on variable rate over stock price   7.50