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Fair Value Measurements - Schedule of Assets and Liabilities at Fair Value (Details) - Fair Value Measurement, Recurring - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Other noncurrent assets |  |
Total assets at fair value | $ 24.8 | $ 27.8
Other noncurrent liabilities |  |
Deferred compensation obligations | 20.4 | 22.3
Total liabilities at fair value | 20.4 | 22.3
Level 1 |  |
Other noncurrent assets |  |
Total assets at fair value | 20.0 | 23.3
Other noncurrent liabilities |  |
Total liabilities at fair value | 0.0 | 0.0
Level 2 |  |
Other noncurrent assets |  |
Total assets at fair value | 2.6 | 2.6
Other noncurrent liabilities |  |
Total liabilities at fair value | 0.0 | 0.0
Assets measured at NAV |  |
Other noncurrent assets |  |
Total assets at fair value | 2.2 | 1.9
Other noncurrent liabilities |  |
Deferred compensation obligations | 20.4 | 22.3
Total liabilities at fair value | 20.4 | 22.3
Money market funds |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 0.8 | 0.3
Money market funds | Level 1 |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 0.8 | 0.3
Time deposits |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 2.6 | 2.6
Time deposits | Level 2 |  |
Cash and cash equivalents |  |
Cash and cash equivalents | 2.6 | 2.6
Other noncurrent assets |  |
Other noncurrent assets |  |
Non-qualified trust funds | 2.2 | 1.9
Deferred compensation investments | 19.2 | 23.0
Other noncurrent assets | Level 1 |  |
Other noncurrent assets |  |
Deferred compensation investments | 19.2 | 23.0
Other noncurrent assets | Assets measured at NAV |  |
Other noncurrent assets |  |
Non-qualified trust funds | $ 2.2 | $ 1.9

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: 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 + Details
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