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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Measurements, Recurring |  |
Derivative financial instruments |  |
Total net assets at fair value | $ 62.5 | $ 54.7
Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Equity investment | 19.4 |
Interest rate contract | Fair Value, Measurements, Recurring | Other current assets |  |
Derivative financial instruments |  |
Derivative asset | 9.2 | 17.2
Interest rate contract | Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Derivative asset | 16.5 | 37.5
Interest rate contract | Fair Value, Measurements, Recurring | Other current liabilities |  |
Derivative financial instruments |  |
Derivative liability | (0.9) |
Interest rate contract | Fair Value, Measurements, Recurring | Other long-term liabilities |  |
Derivative financial instruments |  |
Derivative liability | (3.6) |
Credit facility investment |  |
Derivative financial instruments |  |
Gain representing increase in fair value | 7.2 |
Credit facility investment | Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Alternative Investment | 21.9 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring |  |
Derivative financial instruments |  |
Total net assets at fair value | 19.4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Equity investment | 19.4 |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Derivative financial instruments |  |
Total net assets at fair value | 21.2 | 54.7
Significant Other Observable Inputs (Level 2) | Interest rate contract | Fair Value, Measurements, Recurring | Other current assets |  |
Derivative financial instruments |  |
Derivative asset | 9.2 | 17.2
Significant Other Observable Inputs (Level 2) | Interest rate contract | Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Derivative asset | 16.5 | $ 37.5
Significant Other Observable Inputs (Level 2) | Interest rate contract | Fair Value, Measurements, Recurring | Other current liabilities |  |
Derivative financial instruments |  |
Derivative liability | (0.9) |
Significant Other Observable Inputs (Level 2) | Interest rate contract | Fair Value, Measurements, Recurring | Other long-term liabilities |  |
Derivative financial instruments |  |
Derivative liability | (3.6) |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Derivative financial instruments |  |
Total net assets at fair value | 21.9 |
Significant Unobservable Inputs (Level 3) | Credit facility investment | Fair Value, Measurements, Recurring | Other non-current assets |  |
Derivative financial instruments |  |
Alternative Investment | $ 21.9 |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 35 -Paragraph 54B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482134/820-10-35-54B Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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