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Variable Interest Entities (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets	$ 17,096,394,000		$ 17,096,394,000		$ 15,226,131,000
Liabilities	10,675,895,000		10,675,895,000		9,538,250,000
Ceded premiums written	172,422,000	$ 157,048,000	1,041,864,000	$ 806,672,000
Ceded premiums earned	302,427,000	$ 226,615,000	779,914,000	612,176,000
Investments in other ventures, under equity method	117,307,000		117,307,000		101,974,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Return of capital					84,300,000
Assets	1,600,000,000		1,600,000,000		1,200,000,000
Liabilities	1,600,000,000		1,600,000,000		1,200,000,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Issuance of equity to third party investors					180,600,000
Contributions to subsidiaries			$ 109,800,000		27,200,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Return of capital					$ 33,000,000
Variable interest entity, ownership percentage			14.00%		20.80%
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries			$ 856,700,000		$ 7,500,000
Renaissance Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written			9,100,000	9,400,000
Ceded premiums earned			6,800,000	6,200,000
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	100,000		100,000		25,900,000
Liabilities	100,000		100,000		25,900,000
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary | Renaissance Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written			200,000	200,000
Ceded premiums earned			200,000	4,000,000
Mona Lisa Re Ltd | Variable Interest Entity, Not Primary Beneficiary | DaVinci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written			200,000	200,000
Ceded premiums earned			200,000	$ 2,800,000
Fibonacci Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary | Other Investments
Variable Interest Entity [Line Items]
Investment in participating notes	8,500,000		8,500,000		14,100,000
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	1,300,000		1,300,000		600,000
Langhorne Partners
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	$ 100,000		$ 100,000
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method					$ 0

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