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Derivatives (Narrative) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 01, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Net broker receivable $ 1.2 $ 1.0  
Initial margin 2.0 1.3  
(Decrease) increase in margin deposits outstanding (0.8) $ (0.3)  
Derivatives, Fair Value [Line Items]      
Embedded derivative liability $ 48.6    
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