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Financial Instruments and Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Cash and Equivalents | The following reconciles Cash and equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets as of June 30, 2025 and September 30, 2024, to the total amounts shown in the Condensed Consolidated Statements of Cash Flows:
| June 30, 2025 |  | September 30, 2024
Cash and equivalents | $ | 230.6 |  |  | $ | 267.5 |
Restricted cash | 3.0 |  |  | 6.7 |
Cash and equivalents and restricted cash | $ | 233.6 |  |  | $ | 274.2 |
Schedule of Restricted Cash | The following reconciles Cash and equivalents and restricted cash reported within the Condensed Consolidated Balance Sheets as of June 30, 2025 and September 30, 2024, to the total amounts shown in the Condensed Consolidated Statements of Cash Flows:
| June 30, 2025 |  | September 30, 2024
Cash and equivalents | $ | 230.6 |  |  | $ | 267.5 |
Restricted cash | 3.0 |  |  | 6.7 |
Cash and equivalents and restricted cash | $ | 233.6 |  |  | $ | 274.2 |
Schedule of Notional Amounts of Derivative Instruments | The notional amounts of the Company’s foreign currency-related derivative instruments were as follows as of June 30, 2025 and September 30, 2024:
| Hedge Designation |  | June 30, 2025 |  | September 30, 2024
Foreign exchange contracts(a) | Undesignated |  | $ | 2.7 |  |  | $ | 4.5 |
(a)Represent hedges of transactional foreign exchange exposures resulting primarily from intercompany payables and receivables. Gains and losses on these instruments are recognized immediately in Other income (expense), net. These gains and losses are largely offset by gains and losses on the underlying hedged items, as well as the hedging costs associated with the derivative instruments. Gains and losses recognized to date on these instruments were not material to the Company's Condensed Consolidated Financial Statements.

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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