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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - Interest Rate Swap - USD ($) $ in Millions | 6 Months Ended |
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Mar. 31, 2022 | Sep. 30, 2021
Other current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap agreements | $ 0.7 |
Other non-current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap agreements | 23.9 | $ 1.2
Other current liabilities |  |
Derivative financial instruments |  |
Fair values of the interest rate swap agreements | 1.5 | 5.0
Other long-term liabilities |  |
Derivative financial instruments |  |
Fair values of the interest rate swap agreements |  | $ 1.8
Designated as Hedging Instrument | Cash Flow Hedging |  |
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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061172-113977 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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