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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023
Derivative financial instruments |  |  |
Decrease in fair value | $ (1.6) |  |
Interest Rate Swap and Interest Rate Cap | Other current assets |  |  |
Derivative financial instruments |  |  |
Fair values of the interest rate swap and cap agreements | 15.3 | $ 15.3 | $ 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 | 67.1 | 67.1 | $ 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 | 0.1 | 0.1 |
Level 1 |  |  |
Derivative financial instruments |  |  |
Equity fair value | 12.0 | 12.0 |
Level 3 | Revolving credit facility |  |  |
Derivative financial instruments |  |  |
Revolving credit facility | $ 26.3 | 26.3 |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap |  |  |
Derivative financial instruments |  |  |
Losses recognized in income |  | $ 0.0 |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 5 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480463/815-10-45-5 Reference 2: 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 3: 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 4: 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 + Details
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