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Reserve for Claims and Claim Expenses (Schedule of Incurred and Paid Claims Development) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance $ 15,089,621                  
IBNR and ACR 4,142,784                  
Cumulative paid claims and claim expenses, net of reinsurance 8,946,583                  
Outstanding liabilities from accident year 2009 and prior, net of reinsurance 270,317                  
Claims and claim expenses, net of reinsurance, from the Company's former Bermuda-based insurance operations 229                  
Adjustment for unallocated claim expenses 51,876                  
Unamortized fair value adjustments recorded in connection with acquisitions (69,219)                  
Liability for claims and claim expenses, net of reinsurance 6,593,052                  
Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 6,990,689                  
IBNR and ACR 1,446,950                  
Cumulative paid claims and claim expenses, net of reinsurance 4,732,479                  
Outstanding liabilities from accident year 2009 and prior, net of reinsurance 4,283                  
Adjustment for unallocated claim expenses 19,339                  
Unamortized fair value adjustments recorded in connection with acquisitions (10,606)                  
Liability for claims and claim expenses, net of reinsurance 2,288,762                  
Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 8,098,932                  
IBNR and ACR 2,695,834                  
Cumulative paid claims and claim expenses, net of reinsurance 4,214,104                  
Outstanding liabilities from accident year 2009 and prior, net of reinsurance 266,034                  
Adjustment for unallocated claim expenses 32,537                  
Unamortized fair value adjustments recorded in connection with acquisitions (58,613)                  
Liability for claims and claim expenses, net of reinsurance 4,304,061                  
Accident Year 2010                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,052,931 $ 1,015,540 $ 1,043,565 $ 1,045,490 $ 1,037,725 $ 1,045,727 $ 1,033,341 $ 1,048,747 $ 1,105,041 $ 1,131,892
IBNR and ACR 60,342                  
Cumulative paid claims and claim expenses, net of reinsurance 928,552 912,776 892,480 859,745 746,454 670,935 603,060 518,162 334,347 146,890
Accident Year 2010 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 731,179 681,435 708,343 706,258 696,844 691,473 657,719 636,962 681,287 720,159
IBNR and ACR 50,422                  
Cumulative paid claims and claim expenses, net of reinsurance 623,231 612,013 595,131 581,160 481,489 450,624 401,977 345,574 230,552 104,859
Accident Year 2010 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 321,752 334,105 335,222 339,232 340,881 354,254 375,622 411,785 423,754 411,733
IBNR and ACR 9,920                  
Cumulative paid claims and claim expenses, net of reinsurance 305,321 300,763 297,349 278,585 264,965 220,311 201,083 172,588 103,795 $ 42,031
Accident Year 2011                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,664,869 1,678,015 1,683,614 1,698,378 1,738,452 1,768,793 1,827,258 1,926,506 1,989,024  
IBNR and ACR 55,191                  
Cumulative paid claims and claim expenses, net of reinsurance 1,565,359 1,550,195 1,530,030 1,493,174 1,449,060 1,330,492 1,143,829 728,464 311,906  
Accident Year 2011 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,302,141 1,321,137 1,333,982 1,338,187 1,369,567 1,393,110 1,422,659 1,491,770 1,559,069  
IBNR and ACR 24,335                  
Cumulative paid claims and claim expenses, net of reinsurance 1,264,414 1,257,516 1,252,204 1,230,503 1,207,136 1,121,374 965,668 590,346 262,987  
Accident Year 2011 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 362,728 356,878 349,632 360,191 368,885 375,683 404,599 434,736 429,955  
IBNR and ACR 30,856                  
Cumulative paid claims and claim expenses, net of reinsurance 300,945 292,679 277,826 262,671 241,924 209,118 178,161 138,118 $ 48,919  
Accident Year 2012                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 907,212 901,049 894,168 891,981 927,438 958,139 1,021,668 1,138,018    
IBNR and ACR 48,297                  
Cumulative paid claims and claim expenses, net of reinsurance 783,106 752,614 721,942 647,618 596,634 522,264 416,808 267,764    
Accident Year 2012 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 331,865 336,719 344,535 356,310 375,098 395,203 429,425 559,946    
IBNR and ACR 12,351                  
Cumulative paid claims and claim expenses, net of reinsurance 313,976 308,822 305,627 291,027 280,195 253,699 205,567 165,850    
Accident Year 2012 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 575,347 564,330 549,633 535,671 552,340 562,936 592,243 578,072    
IBNR and ACR 35,946                  
Cumulative paid claims and claim expenses, net of reinsurance 469,130 443,792 416,315 356,591 316,439 268,565 211,241 $ 101,914    
Accident Year 2013                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 699,767 718,563 737,158 761,033 810,934 861,093 912,545      
IBNR and ACR 43,792                  
Cumulative paid claims and claim expenses, net of reinsurance 615,463 587,978 554,686 496,380 434,508 340,652 131,829      
Accident Year 2013 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 222,939 224,748 228,622 240,945 265,570 287,694 317,258      
IBNR and ACR 1,092                  
Cumulative paid claims and claim expenses, net of reinsurance 219,231 216,176 213,351 206,376 191,181 155,459 80,083      
Accident Year 2013 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 476,828 493,815 508,536 520,088 545,364 573,399 595,287      
IBNR and ACR 42,700                  
Cumulative paid claims and claim expenses, net of reinsurance 396,232 371,802 341,335 290,004 243,327 185,193 $ 51,746      
Accident Year 2014                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 953,904 948,264 966,802 990,050 997,906 1,024,813        
IBNR and ACR 114,985                  
Cumulative paid claims and claim expenses, net of reinsurance 741,844 691,774 630,417 554,398 432,761 230,826        
Accident Year 2014 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 265,229 264,754 265,820 270,618 283,608 306,731        
IBNR and ACR 4,554                  
Cumulative paid claims and claim expenses, net of reinsurance 247,663 241,139 234,144 222,509 184,140 106,618        
Accident Year 2014 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 688,675 683,510 700,982 719,432 714,298 718,082        
IBNR and ACR 110,431                  
Cumulative paid claims and claim expenses, net of reinsurance 494,181 450,635 396,273 331,889 248,621 $ 124,208        
Accident Year 2015                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,133,632 1,145,983 1,175,927 1,156,856 1,171,023          
IBNR and ACR 131,005                  
Cumulative paid claims and claim expenses, net of reinsurance 879,950 781,622 662,001 495,119 262,085          
Accident Year 2015 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 301,733 307,088 317,865 334,572 368,766          
IBNR and ACR 11,672                  
Cumulative paid claims and claim expenses, net of reinsurance 279,165 268,545 249,182 215,134 126,831          
Accident Year 2015 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 831,899 838,895 858,062 822,284 802,257          
IBNR and ACR 119,333                  
Cumulative paid claims and claim expenses, net of reinsurance 600,785 513,077 412,819 279,985 $ 135,254          
Accident Year 2016                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,426,575 1,432,001 1,458,767 1,401,451            
IBNR and ACR 251,952                  
Cumulative paid claims and claim expenses, net of reinsurance 971,424 826,502 623,440 286,317            
Accident Year 2016 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 432,269 443,135 458,525 445,532            
IBNR and ACR 53,990                  
Cumulative paid claims and claim expenses, net of reinsurance 350,646 324,296 258,355 119,908            
Accident Year 2016 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 994,306 988,866 1,000,242 955,919            
IBNR and ACR 197,962                  
Cumulative paid claims and claim expenses, net of reinsurance 620,778 502,206 365,085 $ 166,409            
Accident Year 2017                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 2,632,396 2,724,795 2,940,713              
IBNR and ACR 731,975                  
Cumulative paid claims and claim expenses, net of reinsurance 1,371,477 1,067,481 745,098              
Accident Year 2017 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,348,260 1,446,566 1,640,129              
IBNR and ACR 295,210                  
Cumulative paid claims and claim expenses, net of reinsurance 824,443 660,491 534,097              
Accident Year 2017 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,284,136 1,278,229 1,300,584              
IBNR and ACR 436,765                  
Cumulative paid claims and claim expenses, net of reinsurance 547,034 406,990 $ 211,001              
Accident Year 2018                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 2,338,291 2,198,980                
IBNR and ACR 940,346                  
Cumulative paid claims and claim expenses, net of reinsurance 804,566 587,619                
Accident Year 2018 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,054,884 945,829                
IBNR and ACR 273,477                  
Cumulative paid claims and claim expenses, net of reinsurance 450,125 432,201                
Accident Year 2018 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,283,407 1,253,151                
IBNR and ACR 666,869                  
Cumulative paid claims and claim expenses, net of reinsurance 354,441 $ 155,418                
Accident Year 2019                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 2,280,044                  
IBNR and ACR 1,764,899                  
Cumulative paid claims and claim expenses, net of reinsurance 284,842                  
Accident Year 2019 | Property                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,000,190                  
IBNR and ACR 719,847                  
Cumulative paid claims and claim expenses, net of reinsurance 159,585                  
Accident Year 2019 | Casualty and Specialty                    
Claims Development [Line Items]                    
Incurred claims and claim expenses, net of reinsurance 1,279,854                  
IBNR and ACR 1,045,052                  
Cumulative paid claims and claim expenses, net of reinsurance 125,257                  
RenaissanceRe UK                    
Claims Development [Line Items]                    
Liability for claims and claim expenses, net of reinsurance 196,811                  
RenaissanceRe UK | Property                    
Claims Development [Line Items]                    
Liability for claims and claim expenses, net of reinsurance 17,536                  
RenaissanceRe UK | Casualty and Specialty                    
Claims Development [Line Items]                    
Liability for claims and claim expenses, net of reinsurance $ 179,275