Financial Instruments and Fair Value Measurements - Cash and Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Sep. 30, 2025 |
Dec. 31, 2024 |
Sep. 30, 2024 |
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| Fair Value Disclosures [Abstract] | ||||
| Cash and equivalents | $ 201.3 | $ 225.5 | ||
| Restricted cash | 3.1 | 3.1 | ||
| Cash and equivalents and restricted cash | $ 204.4 | $ 228.6 | $ 216.7 | $ 274.2 |
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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