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Derivatives (Narrative) (Details) $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 01, 2022 | Sep. 01, 2017 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 01, 2019
Derivatives, Fair Value [Line Items] |  |  |  |  |
Net broker receivables |  |  | $ 3.4 | $ 0.9 |
Margin deposit assets |  |  | 3.3 | 0.8 |
Increase in variation margin deposits outstanding |  |  | 0.1 | $ 0.1 |
Fair value of embedded derivative liability |  |  | $ 52.4 |  |
Class A Convertible Preferred Units |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Threshold trading days to notify holders |  | 30 days |  |  |
Basis spread |  |  |  |  | 0.0200
Class A Convertible Preferred Units | Scenario, Forecast |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Threshold trading days to notify holders | 30 days |  |  |  |
Reset rate | 10.75% |  |  |  |
Percentage below issue price | 110.00% |  |  |  |
Class A Convertible Preferred Units | LIBOR | Scenario, Forecast |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Basis spread | 0.0750 |  |  |  |

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