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Debt and Credit Facilities (Narrative) (Details)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Jun. 29, 2017
USD ($)
Jun. 01, 2017
USD ($)
May 25, 2017
USD ($)
Dec. 31, 2016
May 31, 2016
USD ($)
May 31, 2016
GBP (£)
Nov. 23, 2015
USD ($)
Nov. 23, 2015
GBP (£)
May 15, 2015
USD ($)
May 04, 2015
USD ($)
Mar. 24, 2015
USD ($)
Sep. 17, 2010
USD ($)
Mar. 17, 2010
USD ($)
Debt Instrument [Line Items]                              
Margin facility amount outstanding $ 487,857,000 £ 10,000,000                          
DaVinciRe Holdings Ltd.                              
Debt Instrument [Line Items]                              
Loan agreement with related party                       $ 100,000,000      
Top Layer Reinsurance Ltd. | Letter of Credit                              
Debt Instrument [Line Items]                              
Collateralized letter of credit and reimbursement agreement 37,500,000                            
Top Layer Reinsurance Ltd. | Letter of Credit | Capital Support Agreement                              
Debt Instrument [Line Items]                              
Mandatory capital contribution in the event of capital and surplus reduction below a specified level 50,000,000                            
Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding $ 0                            
3.450% Senior Notes due 2027                              
Debt Instrument [Line Items]                              
Senior notes interest rate 3.45% 3.45%                          
3.450% Senior Notes due 2027 | RenaissanceRe Finance, Inc. | Senior Notes                              
Debt Instrument [Line Items]                              
Senior notes interest rate     3.45%                        
Debt instrument, face amount     $ 300,000,000                        
3.700% Senior Notes due 2025                              
Debt Instrument [Line Items]                              
Senior notes interest rate 3.70% 3.70%                          
3.700% Senior Notes due 2025 | RenaissanceRe Finance, Inc.                              
Debt Instrument [Line Items]                              
Senior notes interest rate                         3.70%    
Debt instrument, face amount                         $ 300,000,000    
5.75% Senior Notes Due March 15, 2020                              
Debt Instrument [Line Items]                              
Senior notes interest rate 5.75% 5.75%                          
5.75% Senior Notes Due March 15, 2020 | RenRe North America Holdings Inc                              
Debt Instrument [Line Items]                              
Senior notes interest rate                             5.75%
Debt instrument, face amount                             $ 250,000,000
Series B 7.50% Notes Due June 1, 2017                              
Debt Instrument [Line Items]                              
Senior notes interest rate           7.50%                  
Series B 7.50% Notes Due June 1, 2017 | Platinum Underwriters Finance, Inc | Senior Notes                              
Debt Instrument [Line Items]                              
Senior notes interest rate       7.50%                      
Debt instrument, face amount       $ 250,000,000                      
4.750% Senior Notes Due May 1, 2025                              
Debt Instrument [Line Items]                              
Senior notes interest rate 4.75% 4.75%                          
4.750% Senior Notes Due May 1, 2025 | DaVinciRe Holdings Ltd.                              
Debt Instrument [Line Items]                              
Senior notes interest rate                       4.75%      
Debt instrument, face amount                       $ 150,000,000      
Revolving Credit Facility                              
Debt Instrument [Line Items]                              
Letter of credit aggregate commitment                     $ 250,000,000        
Line of credit facility, maximum borrowing capacity                     $ 350,000,000        
Debt to capital ratio 0.35 0.35                          
Minimum net worth requirements $ 2,900,000,000                            
Standby Letter of Credit Facility | Wells Fargo | Letter of Credit                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding 106,794,000                            
Standby Letter of Credit Facility | National Australia Bank Limited | Letter of Credit                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding 3,785,000                            
Bilateral Facility | Citibank Europe PLC | Line of Credit                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding 197,278,000                            
Bilateral Facility | Bilateral Facility Participants | Letter of Credit                              
Debt Instrument [Line Items]                              
Line of credit facility, maximum borrowing capacity                           $ 300,000,000  
Bilateral Facility | Bilateral Facility Participants | Citibank Europe PLC | Letter of Credit                              
Debt Instrument [Line Items]                              
Loan agreement, remaining borrowing capacity 102,700,000                            
Bilateral Facility | Platinum Underwriters Bermuda, Ltd. and Renaissance Reinsurance U.S. Inc. | Letter of Credit                              
Debt Instrument [Line Items]                              
Line of credit facility, maximum borrowing capacity                           $ 25,000,000  
Renaissance Reinsurance FAL Facility | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding $ 180,000,000                            
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit                              
Debt Instrument [Line Items]                              
Collateral amount, percent of aggregate outstanding letters of credit in option 1                 100.00% 100.00%          
Collateral amount, percent of aggregate outstanding letters of credit in case of Full Collateralization Event 100.00% 100.00%             100.00% 100.00%          
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit | Greater than or equal to                              
Debt Instrument [Line Items]                              
Collateral amount, percent of aggregate outstanding letters of credit in option 2                 60.00% 60.00%          
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Letter of Credit | Less than                              
Debt Instrument [Line Items]                              
Collateral amount, percent of aggregate outstanding letters of credit in option 2                 100.00% 100.00%          
Renaissance Reinsurance FAL Facility | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit                              
Debt Instrument [Line Items]                              
Aggregate amount of issuances                 $ 150,000,000.0            
Renaissance Reinsurance FAL Facility | Line of Credit | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit                              
Debt Instrument [Line Items]                              
Letter of credit aggregate commitment                 $ 360,000,000 £ 85,000,000          
Line of credit facility, maximum borrowing capacity         $ 180,000,000   $ 380,000,000                
Renaissance Reinsurance FAL Facility | Line Of Credit Two | Syndicate 1458 | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit                              
Debt Instrument [Line Items]                              
Line of credit facility, maximum borrowing capacity | £               £ 90,000,000              
Specialty Risks FAL Facility | Bank Of Montreal, Citibank Europe and ING Bank | Line of Credit                              
Debt Instrument [Line Items]                              
Margin facility amount outstanding | £   £ 10,000,000                          
Platinum Underwriters Holdings, Ltd. | Bridge Loan                              
Debt Instrument [Line Items]                              
Short-term debt                         $ 300,000,000