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Derivative Instruments - Notional Amount of Derivatives and Other Financial Instruments (Details) £ in Thousands, $ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
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Mar. 31, 2022 CAD ($) | Mar. 31, 2022 GBP (£) | Jun. 30, 2021 CAD ($) | Jun. 30, 2021 GBP (£) | Mar. 31, 2022 GBP (£) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 USD ($)
Denominated in Canadian Dollars | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset | $ 1,075,000 |  |  |  |  |  | $ 675,000 |  |
Net investment hedges | 250,000 |  | $ 250,000 |  |  |  |  |  |
Denominated in Canadian Dollars | Derivative Instruments Not Designated | Purchase Contracts |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset | $ 80,000 |  |  |  |  |  | $ 80,000 |  |
Denominated in Pound Sterling | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset | £ |  |  |  |  | £ 1,890,708 |  |  | £ 1,904,708 |
Net investment hedges | £ |  | £ 1,050,000 |  | £ 1,050,000 |  |  |  |  |
Denominated in U.S Dollars | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  | $ 25,000 |  |  | $ 25,000
Denominated in U.S Dollars | Designated as Hedging Instrument | Fair Value Hedging |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  | 550,000 |  |  | 0
Denominated in U.S Dollars | Derivative Instruments Not Designated |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Derivative asset |  |  |  |  |  | $ 26,137 |  |  | $ 26,137

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
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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. + Details
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- Definition Nominal or face amount used to calculate payments on a nonderivative instrument. + References No definition available. + Details
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