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Debt and Credit Facilities (Narrative) (Details) - USD ($) | Mar. 15, 2020 | Sep. 30, 2020 | Jun. 26, 2020 | Jun. 11, 2020 | Jun. 21, 2019 | Mar. 22, 2019 | Mar. 17, 2010
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5.75% Senior Notes due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 5.75% |  |  |  |  |
Unsecured Bilateral Facility | Letter of Credit | Wells Fargo |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 100,000,000.0 | $ 25,000,000.0 |  |
Unsecured Bilateral Facility | Letter of Credit | Credit Suisse (Switzerland) Ltd. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 200,000,000.0 |  |  | $ 125,000,000.0 |
RenRe North America Holdings Inc | 5.75% Senior Notes due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.75%
Repayment of principal amount | $ 250,000,000.0 |  |  |  |  |  |

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