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Debt and Credit Facilities (Narrative) (Details)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
GBP (£)
Nov. 09, 2018
USD ($)
Jun. 29, 2017
USD ($)
May 25, 2017
USD ($)
May 31, 2016
USD ($)
May 31, 2016
GBP (£)
Nov. 23, 2015
USD ($)
Nov. 23, 2015
GBP (£)
May 04, 2015
USD ($)
Mar. 24, 2015
USD ($)
Sep. 17, 2010
USD ($)
Mar. 17, 2010
USD ($)
Nov. 02, 2005
USD ($)
Debt Instrument [Line Items]                            
Margin facility amount outstanding $ 510,557,000 £ 0                        
Bridge Loan | Platinum Underwriters Holdings, Ltd.                            
Debt Instrument [Line Items]                            
Short-term debt                     $ 300,000,000      
3.450% Senior Notes due 2027                            
Debt Instrument [Line Items]                            
Interest rate 3.45% 3.45%                        
3.700% Senior Notes due 2025                            
Debt Instrument [Line Items]                            
Interest rate 3.70% 3.70%                        
5.75% Senior Notes Due March 15, 2020                            
Debt Instrument [Line Items]                            
Interest rate 5.75% 5.75%                        
4.750% Senior Notes Due May 1, 2025                            
Debt Instrument [Line Items]                            
Interest rate 4.75% 4.75%                        
Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Letter of credit aggregate commitment     $ 500,000,000                      
Line of credit facility, maximum borrowing capacity     750,000,000                      
Debt to capital ratio 0.35 0.35                        
Minimum net worth requirements $ 2,900,000,000                          
Bridge Loan | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity     $ 50,000,000                      
Line of Credit | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Margin facility amount outstanding 0                          
Line of Credit | Renaissance Reinsurance FAL Facility                            
Debt Instrument [Line Items]                            
Margin facility amount outstanding 180,000,000                          
Line of Credit | Specialty Risks FAL Facility                            
Debt Instrument [Line Items]                            
Margin facility amount outstanding | £   £ 0                        
Letter of Credit | Standby Letter of Credit Facility | Wells Fargo                            
Debt Instrument [Line Items]                            
Margin facility amount outstanding 86,861,000                          
Letter of Credit | Bilateral Facility | Citibank Europe PLC                            
Debt Instrument [Line Items]                            
Margin facility amount outstanding 243,696,000                          
RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025                            
Debt Instrument [Line Items]                            
Interest rate                     3.70%      
Debt instrument, face amount                     $ 300,000,000      
RenaissanceRe Finance, Inc. | Senior Notes | 3.450% Senior Notes due 2027                            
Debt Instrument [Line Items]                            
Interest rate       3.45%                    
Debt instrument, face amount       $ 300,000,000                    
RenRe North America Holdings Inc | 5.75% Senior Notes Due March 15, 2020                            
Debt Instrument [Line Items]                            
Interest rate                         5.75%  
Debt instrument, face amount                         $ 250,000,000  
Platinum Underwriters Finance, Inc | Senior Notes | Series B 7.50% Notes Due June 1, 2017                            
Debt Instrument [Line Items]                            
Interest rate                           7.50%
Debt instrument, face amount                           $ 250,000,000
DaVinciRe Holdings Ltd.                            
Debt Instrument [Line Items]                            
Loan agreement with related party                   $ 100,000,000        
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025                            
Debt Instrument [Line Items]                            
Interest rate                   4.75%        
Debt instrument, face amount                   $ 150,000,000        
Bilateral Facility Participants | Letter of Credit | Bilateral Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity                       $ 300,000,000    
Bilateral Facility Participants | Letter of Credit | Bilateral Facility | Citibank Europe PLC                            
Debt Instrument [Line Items]                            
Loan agreement, remaining borrowing capacity $ 56,300,000                          
Renaissance Reinsurance U.S. Inc. | Letter of Credit | Bilateral Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity                       $ 25,000,000    
Syndicate 1458 | Line of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank                            
Debt Instrument [Line Items]                            
Aggregate amount of issuances               $ 150,000,000.0            
Syndicate 1458 | Line of Credit | Renaissance Reinsurance FAL Facility | Line of Credit | Bank of Montreal, Citibank Europe and ING Bank                            
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                
Syndicate 1458 | Line of Credit | Renaissance Reinsurance FAL Facility | Line of Credit Two | Bank of Montreal, Citibank Europe and ING Bank                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity | £             £ 90,000,000              
Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank                            
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%          
Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | 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%          
Syndicate 1458 | Letter of Credit | Renaissance Reinsurance FAL Facility | Bank of Montreal, Citibank Europe and ING Bank | Less than                            
Debt Instrument [Line Items]                            
Collateral amount, percent of aggregate outstanding letters of credit in option 2               100.00% 100.00%          
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