Short-Term and Long-Term Debt - Carrying Amount and Fair Value (Details) - USD ($) $ in Millions |
Mar. 31, 2025 |
Sep. 30, 2024 |
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| Debt Instrument [Line Items] | ||
| Current portion of long-term debt | $ 4.0 | $ 307.0 |
| Reported Value Measurement | ||
| Debt Instrument [Line Items] | ||
| Current portion of long-term debt | 4.0 | 307.0 |
| Long-term debt | 2,568.0 | 2,561.0 |
| Estimate of Fair Value Measurement | ||
| Debt Instrument [Line Items] | ||
| Current portion of long-term debt | 4.0 | 305.0 |
| Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 2,262.0 | $ 2,334.0 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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