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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023
Interest Rate Swap and Interest Rate Cap | Other current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap and cap agreements | $ 15.2 | $ 17.2
Interest Rate Swap and Interest Rate Cap | Other non-current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap and cap agreements | 27.1 | $ 37.5
Interest Rate Swap and Interest Rate Cap | Other Noncurrent Liabilities |  |
Derivative financial instruments |  |
Fair values of the interest rate swap and cap agreements | 0.6 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |
Derivative financial instruments |  |
Losses recognized in income | $ 0.0 |

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- Definition Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Subparagraph (b) -SubTopic 20 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480627/815-20-45-1A + Details
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