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Derivatives (Narrative) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 01, 2022 | Mar. 01, 2019
Derivatives, Fair Value [Line Items] |  |  |  |
Net broker receivables | $ 2.2 | $ 1.0 |  |
Margin deposit assets | 3.1 | 1.3 |  |
Increase (decrease) in variation margin deposits outstanding | (0.9) | $ (0.3) |  |
Fair value of embedded derivative liability | $ 40.8 |  |  |
Convertible Preferred Units |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Basis spread |  |  |  | 2
Convertible Preferred Units | Scenario, Forecast |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Reset rate |  |  | 10.75% |
Percentage below issue price |  |  | 110.00% |
Convertible Preferred Units | LIBOR | Scenario, Forecast |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Basis spread |  |  | 7.50 |

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