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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Statement of Comprehensive Income [Abstract] |  |  |
Hedge loss arising during the period, net of tax | $ 5.8 | $ 5.3 | $ 2.5
Foreign currency translation adjustment, tax | 0.0 | 0.0 | 0.0
Change in pension benefit, net of tax | $ (0.8) | $ 1.7 | $ 1.3

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