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Statutory Requirements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Statutory Accounting Practices [Line Items]    
Dividend rate, Maximum percentage of prior year statutory capital and surplus 25.00%  
Assets Held-in-trust $ 1,292.7  
Renaissance Reinsurance [Member]
   
Statutory Accounting Practices [Line Items]    
Aggregate cash dividends 180.7 513.1
DaVinciRe [Member]
   
Statutory Accounting Practices [Line Items]    
Aggregate cash dividends 6.8 3.1
Glencoe [Member]
   
Statutory Accounting Practices [Line Items]    
Aggregate cash dividends 15.9 0
Aggregate returned capital 234.1 0
Syndicate 1458 [Member]
   
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus 156.4 99.9
Minimum statutory capital and surplus required 145.5 93.9
Percent of FAL supported by letters of credit 100.00%  
Bermuda [Member]
   
Statutory Accounting Practices [Line Items]    
Statutory capital and surplus 2,700.0 3,300.0
Minimum statutory capital and surplus required 552.9 483.3
Target Capital Level as a percentage of Enhanced Capital Requirement 120.00%  
New York [Member] | Renaissance Reinsurance [Member] | Multi-Beneficiary Reinsurance Trust [Member]
   
Statutory Accounting Practices [Line Items]    
Assets Held-in-trust 450.8  
New York [Member] | Renaissance Reinsurance [Member] | Multi-Beneficiary Reinsurance Trust [Member] | Minimum [Member]
   
Statutory Accounting Practices [Line Items]    
Assets Held-in-trust 254.5  
New York [Member] | DaVinciRe [Member] | Multi-Beneficiary Reinsurance Trust [Member]
   
Statutory Accounting Practices [Line Items]    
Assets Held-in-trust 101.9  
New York [Member] | DaVinciRe [Member] | Multi-Beneficiary Reinsurance Trust [Member] | Minimum [Member]
   
Statutory Accounting Practices [Line Items]    
Assets Held-in-trust $ 53.9