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Basis of Presentation and Accounting Policies - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Accounting Policies [Abstract] |  |  |  |  |
Allowance for doubtful accounts | $ 25.0 |  | $ 25.0 |  | $ 22.0
Antidilutive share-based compensation awards (in shares) | 0.6 | 0.5 | 1.3 | 0.5 |
Capital expenditures in accounts payable or other current liabilities at period end |  |  | $ 19.0 | $ 7.0 |
Outstanding purchase of common stock recorded in accounts payable | $ 3.0 | $ 2.0 | 3.0 | $ 2.0 |
Supplier finance program, obligation | $ 56.0 |  | $ 56.0 |  | $ 77.0

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