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Statutory Requirements (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2014
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders | $ 700.0 | $ 700.0 | $ 700.0 |  |
Assets held in trust | 2,500.0 | 2,500.0 | $ 2,500.0 |  | $ 2,400.0
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] |  |  |  |  |
Enhanced capital requirement threshold, percent of risk-based capital model of BMA | 70.00% | 70.00% | 70.00% |  |
Early warning level threshold, percent of risk-based capital model of BMA | 120.00% | 120.00% | 120.00% |  |
Bermuda | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Unrecorded liabilities, exempt by regulatory authority | $ 390.4 | $ 390.4 | $ 390.4 |  | 468.6
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 505.0 | 505.0 | 505.0 |  | 508.6
New York | Multi-Beneficiary Reinsurance Trust | Renaissance Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 378.8 | 378.8 | 378.8 |  | 409.9
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 135.3 | 135.3 | 135.3 |  | 173.7
New York | Multi-Beneficiary Reinsurance Trust | DaVinci Reinsurance Ltd. | Minimum |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 100.1 | 100.1 | 100.1 |  | 105.7
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | Renaissance Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 41.7 | 41.7 | 41.7 |  | 43.2
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 | 15.2 |  | 17.5
New York | Multi-Beneficiary Reduced Collateral Reinsurance Trust | DaVinci Reinsurance Ltd. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Assets held in trust | 18.9 | 18.9 | 18.9 |  | 18.8
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 | 10.4 |  | $ 10.3
U.S. |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders | $ 27.2 | $ 27.2 | $ 27.2 |  |
U.S. | Scenario, Forecast |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Retained earnings available for payment of dividends or distribution to shareholders |  |  |  | $ 26.0 |
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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