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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) day	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 4,432,389		$ 4,432,389		$ 4,324,761
Fixed maturity investments trading	23,772,222		23,772,222		23,562,514
Other liabilities	197		197		2,434
Debt (Note 7)	2,229,135		2,229,135		1,886,689
Long-term debt, fair value	2,300,000		$ 2,300,000		1,900,000
Number of business days required for redemption notice | day			4
Net income	$ 916,510	$ 1,182,487	$ 1,921,852	$ 2,060,019
RenaissanceRe Medici UCITS Fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Noncontrolling ownership percentage	37.90%		37.90%
RenaissanceRe Medici UCITS Fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in kind from existing investors			$ 316,500
Third-Party Investors | RenaissanceRe Medici UCITS Fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Sale of shares to redeemable noncontrolling interests			356,500
RenaissanceRe Medici UCITS Fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net income	$ 7,500		11,000
Net Investment Income | Term Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized (losses) gains recognized in earnings	74,200	208,500	94,000	197,100
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	4,432,389		4,432,389		4,324,761
Fixed maturity investments trading	23,772,222		23,772,222		23,562,514
Other liabilities					41,745
Fair Value, Measurements, Recurring | Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity investments trading	1,456,067		1,456,067		1,422,393
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	1,859,028		1,859,028		2,152,485
Fixed maturity investments trading	13,310,346		13,310,346		12,560,621
Other liabilities					44,082
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	149,751		149,751		168,089
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity investments trading	1,417,242		1,417,242		1,422,393
Significant Other Observable Inputs (Level 2) | Quoted Prices | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	149,800		149,800		168,100
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	32,512		32,512		43,777
Fixed maturity investments trading	38,825		38,825		0
Other liabilities	93		93		405
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	32,512		32,512		43,777
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturity investments trading	38,825		38,825		0
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group two
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	93		93		405
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Direct private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	32,512		32,512		43,777
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Term Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments		$ 94,600		$ 94,600
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net asset value	$ 2,540,849		$ 2,540,849		$ 2,128,499
U.S. Treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.80%		3.80%		4.40%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.80%		4.80%		5.50%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.40%		4.40%		4.70%
Non-U.S. Government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.00%		4.00%		4.50%
Residential Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.00%		5.00%		5.40%
Weighted average life			6 years 9 months 18 days		7 years 8 months 12 days
Commercial Mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.10%		5.10%		5.70%
Weighted average life			3 years 7 months 6 days		3 years 9 months 18 days
Asset-backed | Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	5.50%		5.50%		5.90%
Weighted average life			2 years 10 months 24 days		4 years 8 months 12 days
Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.90%		3.90%		4.20%
Other Short Term Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.00%		4.00%		4.40%
Private Credit Funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Private Credit Funds | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Private Credit Funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net asset value	$ 1,295,385		$ 1,295,385		$ 1,181,146
Direct private equity investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Direct private equity investments | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Direct private equity investments | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net asset value	689,750		$ 689,750		$ 609,105
Insurance-linked securities funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net asset value	150,979		150,979
Insurance-linked securities funds | Fair Value Measured at Net Asset Value Per Share | RenaissanceRe Medici UCITS Fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total net asset value	$ 398,300		$ 398,300

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