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v3.21.1

Senior Notes payable and letter of credit facilities (Details) - Unsecured Debt - 7% Senior Unsecured Notes - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Feb. 28, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt issued | $ 115.0 |  | $ 115.0
Interest rate | 7.00% |  | 7.00%
Debt Issuance Costs, Net | $ 0.7 |  |
Debt instrument, fair value disclosure | $ 117.8 | $ 121.7 |

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