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Variable Interest Entities (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Assets	$ 25,644,210,000		$ 25,644,210,000		$ 18,676,196,000
Liabilities	16,913,942,000		16,913,942,000		11,579,416,000
Redeemable noncontrolling interests	2,779,033,000		2,779,033,000		2,051,700,000
Ceded premiums written	156,938,000	$ 172,422,000	1,246,145,000	$ 1,041,864,000
Ceded premiums earned	343,529,000	302,427,000	1,030,028,000	779,914,000
Investments in other ventures, under equity method	103,978,000		103,978,000		115,172,000
Renaissance Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary | Fibonacci Reinsurance Ltd.
Variable Interest Entity [Line Items]
Ceded premiums written			87,000	9,100,000
Ceded premiums earned			87,000	6,800,000
Ceded net claims and claim expenses			7,500,000	0
Net reinsurance recoverable	7,500,000		7,500,000		0
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	2,800,000,000		2,800,000,000		2,200,000,000
Liabilities	2,800,000,000		2,800,000,000		2,200,000,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries			100,000,000.0		109,800,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor
Variable Interest Entity [Line Items]
Return of capital from subsidiaries			97,100,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | Third party investor | Non-Voting Preference Shares
Variable Interest Entity [Line Items]
Contributions to subsidiaries			$ 604,800,000		$ 856,700,000
Upsilon RFO Re Ltd. | Variable Interest Entity, Primary Beneficiary | RenaissanceRe Holdings Ltd.
Variable Interest Entity [Line Items]
Variable interest entity, ownership percentage			16.70%		14.00%
Vermeer Reinsurance Ltd.
Variable Interest Entity [Line Items]
Redeemable noncontrolling interests	781,738,000	$ 0	$ 781,738,000	$ 0	$ 599,989,000	$ 765,450,000	$ 0	$ 0
Vermeer Reinsurance Ltd. | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	820,400,000		820,400,000		600,400,000
Liabilities	38,700,000		38,700,000		400,000
Redeemable noncontrolling interests	781,700,000		781,700,000		600,000,000.0
Fibonacci Reinsurance Ltd. | Variable Interest Entity, Not Primary Beneficiary | Other investments
Variable Interest Entity [Line Items]
Investment in participating notes	1,000,000.0		1,000,000.0		6,000,000.0
Langhorne Holdings LLC | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	1,700,000		1,700,000		1,300,000
Langhorne Partners | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments in other ventures, under equity method	$ 100,000		$ 100,000		$ 100,000

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