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Statutory Requirements (Narrative) (Details) - USD ($) $ in Millions |  | 9 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2017
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders |  |  |  | $ 1,400.0 |
Decrease in statutory capital requirement | $ 500.0 |  |  |  |
Assets held in trust |  | $ 2,500.0 | $ 2,500.0 | $ 2,700.0 |
Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Dividends and return of capital |  |  | 245.0 |  |
RenaissanceRe Specialty Risks Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Dividends and return of capital |  | 680.0 |  |  |
Bermuda |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Early warning level threshold, percent of risk-based capital model of BMA |  |  |  | 120.00% |
Bermuda | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Unrecorded liabilities, exempt by regulatory authority |  | 390.4 | 390.4 |  |
U.S. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders |  |  |  | $ 26.0 |
U.S. | Scenario, Forecast |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders |  |  |  |  | $ 25.4
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 505.0 | 505.0 | 673.2 |
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 378.8 | 378.8 | 608.3 |
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 135.3 | 135.3 | 136.7 |
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 100.1 | 100.1 | 90.4 |
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 41.7 | 41.7 | 39.5 |
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 15.2 | 15.2 | 14.9 |
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | 18.9 | 18.9 | 19.1 |
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust |  | $ 10.4 | $ 10.4 | $ 14.1 |
FLORIDA | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Multi-beneficiary reduced collateral reinsurance trust collateral reduction |  |  |  | 20.00% |
FLORIDA | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Multi-beneficiary reduced collateral reinsurance trust collateral reduction |  |  |  | 50.00% |

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