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Derivative Financial Instruments and Fair Value Measurements - Schedule of Financial Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Millions | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Derivative [Line Items] |  |
Other current assets | $ 10.5 | $ 9.2
Other non-current assets | 23.3 | 16.5
Other current liabilities | (0.3) | (0.9)
Other long-term liabilities |  | (3.6)
Credit facility investment | 6.2 | 21.9
Equity investment | 24.4 | 19.4
Total net assets at fair value | 64.1 | 62.5
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Derivative [Line Items] |  |
Other current assets | 0.0 | 0.0
Other non-current assets | 0.0 | 0.0
Other current liabilities | 0.0 | 0.0
Other long-term liabilities |  | 0.0
Credit facility investment | 0.0 | 0.0
Equity investment | 24.4 | 19.4
Total net assets at fair value | 24.4 | 19.4
Significant Observable Inputs (Level 2) |  |
Derivative [Line Items] |  |
Other current assets | 10.5 | 9.2
Other non-current assets | 23.3 | 16.5
Other current liabilities | (0.3) | (0.9)
Other long-term liabilities |  | (3.6)
Credit facility investment | 0.0 | 0.0
Equity investment | 0.0 | 0.0
Total net assets at fair value | 33.5 | 21.2
Significant Unobservable Inputs (Level 3) |  |
Derivative [Line Items] |  |
Other current assets | 0.0 | 0.0
Other non-current assets | 0.0 | 0.0
Other current liabilities | 0.0 | 0.0
Other long-term liabilities |  | 0.0
Credit facility investment | 6.2 | 21.9
Equity investment | 0.0 | 0.0
Total net assets at fair value | $ 6.2 | $ 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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