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Debt and Credit Facilities (Narrative) (Details) - 5.750% Senior Notes due 2020 - USD ($) $ in Millions | Mar. 15, 2020 | Mar. 31, 2020 | Mar. 17, 2010
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Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.75% |
RenRe North America Holdings Inc |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 5.75%
Repayment of principal amount | $ 250.0 |  |

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