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Variable Interest Entities (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 01, 2017	Jan. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Assets			$ 15,044,924		$ 15,044,924		$ 12,352,082
Liabilities			9,608,183		9,608,183		6,309,911
Ceded premiums written			157,048	$ 146,002	806,672	$ 735,672
Ceded premiums earned			226,615	$ 167,673	612,176	454,922
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd.
Variable Interest Entity [Line Items]
Return of capital					84,300		242,500
Assets			453,800		453,800		193,000
Liabilities			453,900		453,900		193,000
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Issuance of equity to third party investors					134,100		166,600
Contributions to subsidiaries					9,500		55,200
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Return of capital					$ 33,000		$ 59,800
Variable interest entity, ownership percentage					10.10%		28.80%
Variable Interest Entity, Primary Beneficiary | Upsilon RFO Re Ltd. | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries					$ 7,500
Variable Interest Entity, Primary Beneficiary | Renaissance Reinsurance Ltd. | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					9,400
Ceded premiums earned					6,200
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Issuance of equity to third party investors	$ 45,000	$ 140,000
Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd. | Other Investments
Variable Interest Entity [Line Items]
Investment in participating notes			16,300		16,300
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd
Variable Interest Entity [Line Items]
Assets			26,100		26,100		$ 184,200
Liabilities			$ 26,100		26,100		$ 184,200
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | Renaissance Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					200	7,400
Ceded premiums earned					4,000	5,400
Variable Interest Entity, Not Primary Beneficiary | Mona Lisa Re Ltd | DaVinci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written					224	5,100
Ceded premiums earned					$ 2,800	$ 3,700

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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