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Segment Reporting (Schedule of Significant Components of the Company's Revenues and Expenses) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Gross premiums written $ 2,942,964 $ 2,652,442
Net premiums written 2,165,217 1,824,083
Net premiums earned 1,486,425 1,153,836
Net claims and claim expenses incurred 841,733 867,051
Acquisition expenses 376,507 267,234
Operational expenses 67,907 55,311
Underwriting income (loss) 200,278 (35,760)
Net investment income 83,691 79,804
Net foreign exchange gains (losses) (15,486) (22,788)
Equity in earnings (losses) of other ventures (6,390) (5,558)
Other income (loss) 1,193 2,171
Net realized and unrealized gains (losses) on investments (673,017) (345,563)
Corporate expenses (12,502) (10,405)
Interest expense (11,955) (11,912)
Income (loss) before taxes (434,188) (350,011)
Income tax benefit (expense) 36,707 19,516
Net (income) loss attributable to redeemable noncontrolling interests 11,912 46,850
Dividends on preference shares (8,844) (7,289)
Net income (loss) available (attributable) to RenaissanceRe common shareholders (394,413) (290,934)
Net claims and claim expenses incurred – current accident year 859,566 876,083
Net claims and claim expenses incurred – prior accident years (17,833) (9,032)
Total net incurred $ 841,733 $ 867,051
Net claims and claim expense ratio – current accident year 57.80% 75.90%
Net claims and claim expense ratio – prior accident years (1.20%) (0.80%)
Net claims and claim expense ratio – calendar year 56.60% 75.10%
Underwriting expense ratio 29.90% 28.00%
Combined ratio 86.50% 103.10%
Other    
Segment Reporting Information [Line Items]    
Gross premiums written $ 0 $ 0
Net premiums written 0 0
Net premiums earned 0 0
Net claims and claim expenses incurred 0 0
Acquisition expenses 0 0
Operational expenses 0 0
Underwriting income (loss) 0 0
Net investment income 83,691 79,804
Net foreign exchange gains (losses) (15,486) (22,788)
Equity in earnings (losses) of other ventures (6,390) (5,558)
Other income (loss) 1,193 2,171
Net realized and unrealized gains (losses) on investments (673,017) (345,563)
Corporate expenses (12,502) (10,405)
Interest expense (11,955) (11,912)
Income tax benefit (expense) 36,707 19,516
Net (income) loss attributable to redeemable noncontrolling interests 11,912 46,850
Dividends on preference shares (8,844) (7,289)
Net claims and claim expenses incurred – current accident year 0 0
Net claims and claim expenses incurred – prior accident years 0 0
Total net incurred 0 0
Property    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years (16,758) (5,162)
Property | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 1,343,508 1,616,819
Net premiums written 890,166 1,008,460
Net premiums earned 618,591 605,166
Net claims and claim expenses incurred 259,761 498,832
Acquisition expenses 127,096 112,754
Operational expenses 46,932 35,375
Underwriting income (loss) 184,802 (41,795)
Net claims and claim expenses incurred – current accident year 276,519 503,994
Net claims and claim expenses incurred – prior accident years (16,758) (5,162)
Total net incurred $ 259,761 $ 498,832
Net claims and claim expense ratio – current accident year 44.70% 83.30%
Net claims and claim expense ratio – prior accident years (2.70%) (0.90%)
Net claims and claim expense ratio – calendar year 42.00% 82.40%
Underwriting expense ratio 28.10% 24.50%
Combined ratio 70.10% 106.90%
Casualty and Specialty    
Segment Reporting Information [Line Items]    
Net claims and claim expenses incurred – prior accident years $ (1,075) $ (3,870)
Casualty and Specialty | Operating Segments    
Segment Reporting Information [Line Items]    
Gross premiums written 1,599,456 1,035,623
Net premiums written 1,275,051 815,623
Net premiums earned 867,834 548,670
Net claims and claim expenses incurred 581,972 368,219
Acquisition expenses 249,411 154,480
Operational expenses 20,975 19,936
Underwriting income (loss) 15,476 6,035
Net claims and claim expenses incurred – current accident year 583,047 372,089
Net claims and claim expenses incurred – prior accident years (1,075) (3,870)
Total net incurred $ 581,972 $ 368,219
Net claims and claim expense ratio – current accident year 67.20% 67.80%
Net claims and claim expense ratio – prior accident years (0.10%) (0.70%)
Net claims and claim expense ratio – calendar year 67.10% 67.10%
Underwriting expense ratio 31.10% 31.80%
Combined ratio 98.20% 98.90%