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Credit Facilities (Summary Of Outstanding Letters Of Credit And Borrowings) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2021 GBP (£)	Dec. 31, 2020 GBP (£)	Jun. 30, 2021 USD ($)	May 05, 2021 USD ($)	Feb. 23, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 25, 2020 USD ($)	May 26, 2016 USD ($)	Jun. 22, 2012 USD ($)
Line of Credit Facility [Line Items]
Commitment			$ 1,300,000,000
Wells Fargo Bank Group Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000			$ 800,000,000		$ 800,000,000	$ 800,000,000
In Use			402,284,000			753,932,000
Wells Fargo Bank Group Credit Facility Tranche One [Member]
Line of Credit Facility [Line Items]
Commitment						200,000,000
In Use						164,242,000	$ 50,000,000
Date of Expiry	Dec. 31, 2021
Wells Fargo Bank Group Credit Facility Tranche Two [Member]
Line of Credit Facility [Line Items]
Commitment			600,000,000			600,000,000
In Use			402,284,000			589,690,000
Date of Expiry	Dec. 31, 2021	Dec. 31, 2021
Wells Fargo Bank Bilateral Loc Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			500,000,000	$ 500,000,000	$ 50,000,000
In Use			404,421,000
Date of Expiry	Dec. 31, 2021
Citibank Bilateral Agreement [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000			200,000,000
In Use			173,553,000			185,483,000
Citibank Bilateral Letter Of Credit Agreement One [Member]
Line of Credit Facility [Line Items]
Commitment			200,000,000			200,000,000
In Use			1,264,000			4,425,000
Date of Expiry	Nov. 24, 2021	Feb. 28, 2021
Citibank Bilateral Letter Of Credit Agreement Two [Member]
Line of Credit Facility [Line Items]
In Use			449,000			3,672,000
Date of Expiry	Dec. 16, 2021	Nov. 24, 2021
Citibank Bilateral Letter Of Credit Agreement Three [Member]
Line of Credit Facility [Line Items]
In Use			138,869,000			448,000
Date of Expiry	Dec. 31, 2021	Dec. 16, 2021
Citibank Bilateral Letter Of Credit Agreement Four [Member]
Line of Credit Facility [Line Items]
In Use			4,425,000			115,000
Date of Expiry	Feb. 28, 2022	Dec. 20, 2021
Citibank Bilateral Letter Of Credit Agreement Five [Member]
Line of Credit Facility [Line Items]
In Use			443,000			136,383,000
Date of Expiry	Mar. 01, 2022	Dec. 31, 2021
Citibank Bilateral Letter Of Credit Agreement Six [Member]
Line of Credit Facility [Line Items]
In Use			822,000			39,619,000
Date of Expiry	Aug. 15, 2022	Dec. 30, 2024
Citibank Bilateral Letter Of Credit Agreement Seven [Member]
Line of Credit Facility [Line Items]
In Use			155,000			821,000
Date of Expiry	Dec. 20, 2022	Aug. 15, 2022
Citibank Bilateral Letter Of Credit Agreement Eight [Member]
Line of Credit Facility [Line Items]
In Use			27,126,000
Date of Expiry	Jun. 30, 2025
Lloyds Bank plc Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 52,175,000	£ 52,175,000
In Use | £	52,175,000	52,175,000
Lloyd's Bank Issuance One [Member]
Line of Credit Facility [Line Items]
Commitment | £	£ 52,175,000	£ 52,175,000
In Use			$ 52,175,000			$ 52,175,000
Date of Expiry	Dec. 31, 2024	Dec. 31, 2023

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=120391452&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=120398452&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=120400017&loc=d3e572229-122910

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X

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ 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
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- 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.

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- Definition

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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