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Subsequent Events (Details) - USD ($)
$ / shares in Units, shares in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2016
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Feb. 18, 2016
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 19, 2016
Feb. 01, 2016
Nov. 13, 2015
Jan. 01, 2015
Jul. 01, 2014
Jan. 01, 2014
Subsequent Event [Line Items]                                
Investment in variable interest entity               $ 0 $ 0 $ 0            
Common stock                                
Subsequent Event [Line Items]                                
Repurchase of shares               2,473                
Repurchase of shares               $ (259,900,000)                
Common shares repurchased during period, Average cost per share (in dollars per share)               $ 105.10                
Share repurchase program, Authorized aggregate amount                         $ 500,000,000      
Subsequent Event | Common stock                                
Subsequent Event [Line Items]                                
Repurchase of shares         717                      
Repurchase of shares         $ (79,300,000)                      
Common shares repurchased during period, Average cost per share (in dollars per share)         $ 110.57                      
Share repurchase program, Authorized aggregate amount                     $ 500,000,000          
DaVinciRe Holdings Ltd.                                
Subsequent Event [Line Items]                                
Redeemable noncontrolling interest, ownership percentage           26.50%   26.30% 23.40%         26.30% 23.40% 26.50%
Noncontrolling interest, value subscribed               $ 0 $ 48,576,000              
Redemption of shares from redeemable noncontrolling interests               $ 212,750,000 224,455,000              
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest                                
Subsequent Event [Line Items]                                
Redeemable noncontrolling interest, net redemptions     $ 225,000,000 $ 300,000,000                        
Redeemable noncontrolling interest, Reserve holdback     $ 22,500,000 $ 30,000,000                        
DaVinciRe Holdings Ltd. | Redeemable Noncontrolling Interest | Subsequent Event                                
Subsequent Event [Line Items]                                
Redeemable noncontrolling interest, net redemptions   $ 100,000,000                            
Redeemable noncontrolling interest, Reserve holdback   $ 20,000,000                            
Redeemable noncontrolling interest, ownership percentage   24.00%                            
Upsilon RFO | Primary Beneficiary                                
Subsequent Event [Line Items]                                
Capital distribution payable                 420,200,000              
Variable interest entity, ownership percentage           23.90% 38.90% 21.70%                
Return of capital               $ 418,500,000                
Upsilon RFO | Primary Beneficiary | Non-voting preference shares                                
Subsequent Event [Line Items]                                
Non-voting preference shares issued to third parties           $ 43,100,000 $ 172,400,000 153,700,000                
Investment in variable interest entity           $ 13,500,000 $ 109,700,000 42,500,000                
Upsilon RFO | Primary Beneficiary | RenaissanceRe Holdings Ltd. (Parent Guarantor)                                
Subsequent Event [Line Items]                                
Capital distribution payable                 $ 132,300,000              
Return of capital               $ 131,600,000                
Upsilon RFO | Subsequent Event | Primary Beneficiary                                
Subsequent Event [Line Items]                                
Capital distribution payable $ 200,500,000                              
Variable interest entity, ownership percentage 28.30%                              
Return of capital $ 96,700,000                              
Upsilon RFO | Subsequent Event | Primary Beneficiary | Non-voting preference shares                                
Subsequent Event [Line Items]                                
Non-voting preference shares issued to third parties 62,500,000                              
Investment in variable interest entity 25,300,000                              
Upsilon RFO | Subsequent Event | Primary Beneficiary | RenaissanceRe Holdings Ltd. (Parent Guarantor)                                
Subsequent Event [Line Items]                                
Capital distribution payable 41,300,000                              
Return of capital $ 16,000,000                              
Medici                                
Subsequent Event [Line Items]                                
Redeemable noncontrolling interest, ownership percentage               46.10% 53.20%              
Noncontrolling interest, value subscribed               $ 36,073,000 $ 57,264,000              
Redemption of shares from redeemable noncontrolling interests               $ 20,117,000 $ 3,075,000              
Medici | Subsequent Event                                
Subsequent Event [Line Items]                                
Redeemable noncontrolling interest, ownership percentage                       42.30%        
Noncontrolling interest, value subscribed         $ 20,000,000                      
Redemption of shares from redeemable noncontrolling interests         $ 800,000