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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, 2025 | Sep. 30, 2024 | Sep. 30, 2023
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 | $ 2.0 | $ 17.0 | $ 35.0
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 | 7.0 | (21.0) | 18.0
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 | (1.0) | 2.0 | 6.0
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 | 7.0 | 19.0 | 33.0
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 | 0.0 | 0.0 | 0.0
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 | $ (4.0) | $ (4.0) | $ (4.0)

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- Definition The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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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 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (o) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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