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Derivative Financial Instruments and Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2024
Derivative Financial Instruments and Fair Value Measurements |
Schedule of notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2024
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Effective | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date |  | Date
USD | ​ | ​ | 400.0 | ​ | 1.283 | % | February 2023 | ​ | March 2028
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2023
Notional Amount | ​ | Notional Amount | ​ | Fixed | ​ | Effective | ​ | Expiration
Currency |  | (in millions) |  | Rate |  | Date |  | Date
USD | ​ | ​ | 400.0 | ​ | 1.283 | % | February 2023 | ​ | March 2028
​
Schedule of non-pension financial assets and liabilities recorded at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of September 30, 2024
​ | ​ | ​ |  | Quoted Prices in |  |  | ​ |  | Significant |  | ​ | ​
​ | ​ | ​ | ​ | Active Markets for | ​ | Significant | ​ | Unobservable | ​ |  | ​
​ | ​ | ​ | ​ | Identical Assets | ​ | Observable | ​ | Inputs | ​ | Total
​ | ​ | Balance Sheet Location | ​ | (Level 1) | ​ | Inputs (Level 2) | ​ | (Level 3) | ​ | Fair Value
​ | ​ | (in millions)
Interest rate contracts |  | Other current assets | ​ | $ | — | ​ | $ | 9.2 | ​ | $ | — | ​ | $ | 9.2
Interest rate contracts |  | Other non-current assets | ​ |  | — | ​ |  | 16.5 | ​ |  | — | ​ |  | 16.5
Interest rate contracts |  | Other current liabilities | ​ |  | — | ​ |  | (0.9) | ​ |  | — | ​ |  | (0.9)
Interest rate contracts |  | Other long-term liabilities | ​ |  | — | ​ |  | (3.6) | ​ |  | — | ​ |  | (3.6)
Credit facility investment |  | Other non-current assets | ​ |  | — | ​ |  | — | ​ |  | 21.9 | ​ |  | 21.9
Equity investment |  | Other non-current assets | ​ |  | 19.4 | ​ |  | — | ​ |  | — | ​ |  | 19.4
Total net assets at fair value | ​ | ​ | ​ | $ | 19.4 | ​ | $ | 21.2 | ​ | $ | 21.9 | ​ | $ | 62.5
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of September 30, 2023
​ | ​ | ​ |  | Quoted Prices in |  |  | ​ |  | Significant |  | ​ | ​
​ | ​ | ​ | ​ | Active Markets for | ​ | Significant | ​ | Unobservable | ​ | ​ |
​ | ​ | ​ | ​ | Identical Assets | ​ | Observable | ​ | Inputs | ​ | ​ | Total
​ | ​ | Balance Sheet Location | ​ | (Level 1) | ​ | Inputs (Level 2) | ​ | (Level 3) | ​ | Fair Value
​ | ​ | (in millions)
Interest rate contracts | ​ | Other current assets | ​ | $ | — | ​ | $ | 17.2 | ​ | $ | — | ​ | $ | 17.2
Interest rate contracts | ​ | Other non-current assets | ​ |  | — | ​ |  | 37.5 | ​ |  | — | ​ |  | 37.5
Total net assets at fair value | ​ | ​ | ​ | $ | — | ​ | $ | 54.7 | ​ | $ | — | ​ | $ | 54.7
Schedule of changes in the fair value of the Company's Level 3 investment assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year-ended September 30, 2024
​ | ​ | Beginning |  | Investment |  | ​ |  | ​ |  | ​ |  | ​ | ​
​ | ​ | Balance | ​ | Gains/(Losses) | ​ | Interest Earned | ​ | Purchases | ​ | Sales | ​ | Ending Balance
​ | ​ | ​ | (in millions)
Credit facility investment including accrued interest | ​ | $ | — | ​ | 0.5 | ​ | 0.5 | ​ | 32.5 | ​ | (11.6) | ​ | $ | 21.9
​

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- Definition Tabular disclosure of the notional amounts, fixed rates and related expiration dates of outstanding derivative positions. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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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