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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Derivative [Line Items] |  |  |
Net losses on foreign currency exposures | $ 1.7 | $ 3.2 | $ 7.0
Net realized and unrealized gain or (loss) (excluding the underlying foreign currency exposure being hedged) | $ 7.0 | $ (8.4) | $ (7.5)
Forward Contracts | Designated as Hedging Instrument | Net Investment Hedging |  |  |
Derivative [Line Items] |  |  |
Derivative, remaining maturity | 3 months |  |

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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized loss recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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