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Debt and Credit Facilities (Summary of Debt Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 29, 2017	Jun. 01, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, Fair value	$ 1,034,200			$ 964,800
Debt	$ 989,245			$ 948,663
3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.45%
3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument, Interest rate	3.70%
5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument, Interest rate	5.75%
Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Debt instrument, Interest rate				7.50%
4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Debt instrument, Interest rate	4.75%
Senior Notes
Debt Instrument [Line Items]
Long-term debt, Fair value	$ 1,034,244			$ 964,800
Debt	989,245			948,663
Senior Notes | 3.700% Senior Notes due 2025
Debt Instrument [Line Items]
Long-term debt, Fair value	309,648			291,750
Debt	297,225			296,948
Senior Notes | 5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Long-term debt, Fair value	269,265			270,875
Debt	249,188			248,941
Senior Notes | RenaissanceRe Finance, Inc. | 3.450% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term debt, Fair value	296,589			0
Debt	295,179			0
Debt instrument, Interest rate		3.45%
Senior Notes | Platinum Underwriters Finance, Inc | Series B 7.50% Senior Notes due 2017
Debt Instrument [Line Items]
Long-term debt, Fair value	0			257,500
Debt	0			255,352
Debt instrument, Interest rate			7.50%
Senior Notes | DaVinciRe Holdings Ltd. | 4.750% Senior Notes due 2025 (DaVinciRe)
Debt Instrument [Line Items]
Long-term debt, Fair value	158,742			144,675
Debt	$ 147,653			$ 147,422

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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