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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Derivative [Line Items] |  |  |
Pre-tax net losses associated with interest rate hedges | $ 4,000,000 |  |
Pre-tax losses associated with net investment hedges | 32,000,000 | $ 20,000,000 |
Interest Rate Protection Agreements |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 0 | $ 0 | $ 0
Foreign Exchange Forward |  |  |
Derivative [Line Items] |  |  |
Derivative notional amount percent of required need coverage | 90.00% |  |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: 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=121590274&loc=SL5580258-113959 Reference 2: 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=121590274&loc=SL5579245-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from derivative designated and qualifying as net investment hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CCC -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998896-113959 + Details
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