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Derivative Instruments - Pre-tax Amount of Gains (Losses) on Forward Exchange Contracts Designated as Hedging Instruments (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Designated as Hedging Instrument |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax amount of (losses) gains reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges | $ 17.0 | $ 35.9 | $ 18.0
Forward exchange contracts |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax (losses) gains recorded in other comprehensive income related to cash flow hedges | (21.0) | 17.2 | 70.5
Sales | Designated as Hedging Instrument |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax amount of (losses) gains reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges | 2.1 | 6.0 | 0.7
Cost of sales | Designated as Hedging Instrument |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax amount of (losses) gains reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges | 18.4 | 33.4 | 21.8
Selling, general and administrative expenses | Designated as Hedging Instrument |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax amount of (losses) gains reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges | 0.1 | 0.0 | (0.9)
Interest expense | Designated as Hedging Instrument |  |  |
Unrealized Gain (Loss) On Foreign Currency Derivative Net Before Tax, Amount |  |  |
Pre-tax amount of (losses) gains reclassified from accumulated other comprehensive income into the Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges | $ (3.6) | $ (3.5) | $ (3.6)

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- Definition Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 20 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482014/830-20-35-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481956/830-20-45-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481926/830-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481839/830-10-45-17 + Details
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