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Basis of Presentation and Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 6 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Accounting Policies [Abstract] |  |
Operating leases | $ 24.0 | $ 91.0
Finance leases | $ 0.0 | $ 5.0

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