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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - Mar. 31, 2019 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 1,392,993	£ 0
Specialty Risks FAL Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding | £		£ 0
RenaissanceRe Revolving Credit Facility | Line of Credit
Line of Credit Facility [Line Items]
Credit facilities outstanding	200,000
Letter of Credit | Renaissance Reinsurance FAL Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	255,000
Letter of Credit | Wells Fargo | Uncommitted Standby Letter of Credit Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	32,009
Letter of Credit | Citibank Europe PLC
Line of Credit Facility [Line Items]
Credit facilities outstanding	0
Letter of Credit | Citibank Europe PLC | Bilateral Facility
Line of Credit Facility [Line Items]
Credit facilities outstanding	238,956
Letter of Credit | Mizuho Bank, Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	385,975
Letter of Credit | The Bank of Tokyo-Mitsubishi UFJ Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	205,956
Letter of Credit | Credit Suisse (Switzerland) Ltd.
Line of Credit Facility [Line Items]
Credit facilities outstanding	$ 75,097

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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