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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%