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Debt and Credit Facilities (Debt Obligations Narrative) (Details) - USD ($)	Mar. 15, 2020	Apr. 02, 2019	Jun. 29, 2017	May 04, 2015	Mar. 24, 2015	Mar. 17, 2010
Bridge Loan | Platinum Underwriters Holdings, Ltd.
Debt Instrument [Line Items]
Short-term debt					$ 300,000,000.0
3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate		3.60%
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Interest rate			3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Interest rate					3.70%
Senior Notes | 3.600% Senior Notes due 2029
Debt Instrument [Line Items]
Face amount		$ 400,000,000.0
Repayments of long-term lines of credit		$ 200,000,000.0
RenaissanceRe Finance, Inc. | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Face amount					$ 300,000,000.0
RenaissanceRe Finance, Inc. | Senior Notes | 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Face amount			$ 300,000,000.0
RenRe North America Holdings Inc | 5.75% Senior Notes Due March 15, 2020
Debt Instrument [Line Items]
Interest rate						5.75%
Face amount						$ 250,000,000.0
Repayments of long-term debt	$ 250,000,000.0
DaVinciRe Holdings Ltd.
Debt Instrument [Line Items]
Loan agreement with related party				$ 100,000,000.0
DaVinciRe Holdings Ltd. | 4.750% Senior Notes Due May 1, 2025
Debt Instrument [Line Items]
Interest rate				4.75%
Face amount				$ 150,000,000.0

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