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Debt and Credit Facilities (Narrative) (Details) - USD ($)	Mar. 15, 2020	Sep. 30, 2020	Jun. 26, 2020	Jun. 11, 2020	Jun. 21, 2019	Mar. 22, 2019	Mar. 17, 2010
5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Stated interest rate		5.75%
Unsecured Bilateral Facility | Letter of Credit | Wells Fargo
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 100,000,000.0	$ 25,000,000.0
Unsecured Bilateral Facility | Letter of Credit | Credit Suisse (Switzerland) Ltd.
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 200,000,000.0			$ 125,000,000.0
RenRe North America Holdings Inc | 5.75% Senior Notes due 2020
Debt Instrument [Line Items]
Stated interest rate							5.75%
Repayment of principal amount	$ 250,000,000.0

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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