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Debt and Credit Facilities - Debt Obligations Narrative (Details) - USD ($)			12 Months Ended
	Jun. 05, 2023	Apr. 02, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015	Feb. 25, 2015
Debt Instrument [Line Items]
Issuance of debt, net of expenses			$ 740,581,000	$ 0	$ 0
Bridge Loan \| Platinum Underwriters Holdings, Ltd.
Debt Instrument [Line Items]
Short-term debt									$ 300,000,000
3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate		3.60%	3.60%
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%
Senior Notes \| 5.750% Senior Notes due 2033
Debt Instrument [Line Items]
Interest rate	5.75%		5.75%
Face amount	$ 750,000,000
Issuance of debt, net of expenses	$ 741,000,000
Senior Notes \| 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Face amount		$ 400,000,000
Repayments of long-term lines of credit		$ 200,000,000
RenaissanceRe Finance, Inc. \| 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Face amount								$ 300,000,000
RenaissanceRe Finance, Inc. \| Senior Notes \| 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Face amount						$ 300,000,000
DaVinci Holdings Ltd.
Debt Instrument [Line Items]
Loan agreement with related party							$ 100,000,000
DaVinci Holdings Ltd. \| 4.750% Senior Notes Due May 1, 2025
Debt Instrument [Line Items]
Interest rate			4.75%				4.75%
Face amount							$ 150,000,000