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Subsequent Events (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 10, 2020 USD ($) series | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  |  |  | $ 618,700,000 | $ 512,800,000 | $ 856,700,000
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Variable interest entity, ownership percentage |  |  |  | 16.50% |  | 14.00%
Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. | Non-voting preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  |  |  | $ 100,000,000.0 |  | $ 109,800,000
Subsequent Event | Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  | $ 620,900,000 |  |  |  |
Subsequent Event | Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Variable interest entity, ownership percentage |  | 16.50% |  |  |  |
Subsequent Event | Upsilon RFO Re Ltd. | Primary Beneficiary | RenaissanceRe Holdings Ltd. | Non-voting preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  | $ 103,100,000 |  |  |  |
Subsequent Event | Mona Lisa Re | Not Primary Beneficiary |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of series of notes | series | 2 |  |  |  |  |
Face amount | $ 400,000,000.0 |  |  |  |  |
Other liabilities | Upsilon RFO Re Ltd. | Primary Beneficiary | Investor | Non-voting preference shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Investment in variable interest entity |  |  | $ 462,800,000 |  |  |

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