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Subsequent Events (Details) - Upsilon RFO Re Ltd. - Primary Beneficiary - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 30, 2018 | Dec. 31, 2017
Non-voting preference shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in variable interest entity |  |  | $ 109.8 |  | $ 27.2
Investor | Non-voting preference shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in variable interest entity |  |  | $ 856.7 | $ 400.0 | $ 7.5
RenaissanceRe Holdings Ltd. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Variable interest entity, ownership percentage |  |  | 14.00% |  | 20.80%
Subsequent Event | Non-voting preference shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in variable interest entity | $ 100.0 |  |  |  |
Subsequent Event | Investor | Non-voting preference shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in variable interest entity | $ 456.8 |  |  |  |
Subsequent Event | RenaissanceRe Holdings Ltd. |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Variable interest entity, ownership percentage | 16.90% |  |  |  |
Other liabilities | Investor | Non-voting preference shares |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Investment in variable interest entity |  | $ 300.0 |  |  |

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