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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities at Fair Value | The Company’s financial assets and liabilities accounted for at fair value on a recurring basis are summarized below by level within the fair value hierarchy:
|  | As of September 30, 2025 |  |  |  |  |  |  |  |  |  |
(In millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | NAV (a) |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 0.8 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | 2.6 |  |  | — |  |  | 2.6 |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified trust funds |  | 2.2 |  |  | — |  |  | — |  |  | — |  |  | 2.2 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation investments |  | 19.2 |  |  | 19.2 |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Total assets at fair value |  | $ | 24.8 |  |  | $ | 20.0 |  |  | $ | 2.6 |  |  | $ | — |  |  | $ | 2.2 |  |  |  |  |  |  |  |  |  |  |
Other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligations |  | 20.4 |  |  | — |  |  | — |  |  | — |  |  | 20.4 |  |  |  |  |  |  |  |  |  |  |
Total liabilities at fair value |  | $ | 20.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 20.4 |  |  |  |  |  |  |  |  |  |  |
|  | As of September 30, 2024 |  |  |  |  |  |  |  |  |  |
(In millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | NAV (a) |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 0.3 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  |  |  |  |  |  |  |  |
Time deposits |  | 2.6 |  |  | — |  |  | 2.6 |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-qualified trust funds |  | 1.9 |  |  | — |  |  | — |  |  | — |  |  | 1.9 |  |  |  |  |  |  |  |  |  |  |
Deferred compensation investments |  | 23.0 |  |  | 23.0 |  |  | — |  |  | — |  |  | — |  |  |  |  |  |  |  |  |  |  |
Total assets at fair value |  | $ | 27.8 |  |  | $ | 23.3 |  |  | $ | 2.6 |  |  | $ | — |  |  | $ | 1.9 |  |  |  |  |  |  |  |  |  |  |
Other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation obligations |  | 22.3 |  |  | — |  |  | — |  |  | — |  |  | 22.3 |  |  |  |  |  |  |  |  |  |  |
Total liabilities at fair value |  | $ | 22.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 22.3 |  |  |  |  |  |  |  |  |  |  |
(a)Funds measured at fair value using the NAV per share practical expedient have not been classified in the fair value hierarchy.
Summary of Fair Value of Debt | The fair values of the Company's outstanding fixed rate senior notes shown in the table below are based on recent trading values, which are considered Level 2 inputs within the fair value hierarchy.
|  | September 30, 2025 |  | September 30, 2024
(In millions) |  | Fair value |  | Carrying value (a) |  | Unamortized discounts and issuance costs |  | Fair value |  | Carrying value (a) |  | Unamortized discounts and issuance costs
2031 Notes |  | $ | 491.0 |  |  | $ | 531.0 |  |  | $ | (4.0) |  |  | $ | 478.5 |  |  | $ | 530.4 |  |  | $ | (4.6) |
(a)Carrying values shown are net of unamortized discounts and issuance costs.

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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