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Derivatives (Narrative) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 01, 2022
Mar. 01, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Net broker receivable $ 3.1 $ 5.6    
Initial margin 2.4 5.1    
(Decrease) increase in margin deposits outstanding 0.7 $ 0.5    
Derivatives, Fair Value [Line Items]        
Embedded derivative liability $ 36.7      
Scenario, Forecast | Class A Convertible Preferred Stock Units        
Derivatives, Fair Value [Line Items]        
Basis spread on variable rate over stock price       0.0200
Stock reset rate percentage     10.75%  
Percentage below issue price per share     10.00%  
LIBOR | Scenario, Forecast | Class A Convertible Preferred Stock Units        
Derivatives, Fair Value [Line Items]        
Basis spread on variable rate over stock price     0.0750