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Fair Value (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping [Table Text Block] | For the financial assets and liabilities that the Company does not reflect at fair value, the following tables present both their respective carrying value and fair value at September 30, 2025 and 2024.
|  |  | Fair Value at September 30, 2025
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (a) | $ | 379.2 |  |  | $ | 379.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 379.2 |
Debt (b) (c) | 802.7 |  |  | — |  |  | 808.9 |  |  | 9.9 |  |  | 818.8 |
|  |  | Fair Value at September 30, 2024
| Carrying Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in millions)
Cash and cash equivalents (a) | $ | 481.2 |  |  | $ | 481.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 481.2 |
Debt (b) (c) | 706.4 |  |  | — |  |  | 683.6 |  |  | 9.9 |  |  | 693.5 |
_____________________ (a) The fair values of cash and cash equivalents approximate their carrying values due to their short-term nature and are classified as Level 1 within the fair value hierarchy. (b) At September 30, 2025 and 2024, debt primarily consisted of the Company's senior notes. The fair value of the senior notes is determined based on quoted market prices in markets that are not active, which is classified as Level 2 within the fair value hierarchy. (c) The fair values of the Company's other note payable approximate carrying value due to its short-term nature and is classified as Level 3 within the fair value hierarchy.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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