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Derivatives (Narrative) (Details) $ in Millions | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 01, 2022 | Dec. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |
Net broker receivable |  | $ 4.6 |  | $ 0.9
Initial margin |  | 4.0 |  | $ 0.8
Increase in variation margin | $ 0.1 | 0.6 |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Embedded derivative liability |  | $ 34.1 |  |
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 |

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