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Short-Term and Long-Term Debt - Carrying Amount and Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 2.0 | $ 307.0
Long-term debt | 2,617.0 | 2,561.0
Reported Value Measurement |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 2.0 | 307.0
Long-term debt | 2,617.0 | 2,561.0
Estimate of Fair Value Measurement |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 2.0 | 305.0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,286.0 | $ 2,334.0

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