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Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Statement of Comprehensive Income [Abstract] |  |  |
Hedge gain (loss) arising during the period, tax | $ 2.5 | $ (5.8) | $ (0.4)
Foreign currency translation adjustment, tax | 0.0 | 0.0 | 0.0
Unrealized gain (loss) on marketable securities, tax | 0.0 | 0.0 | 0.0
Amortization of net actuarial pension gain included in net income, tax | (0.1) | (0.4) | (1.2)
Tax provision (benefit) related to pension net gain (loss) occurring during the year | 1.3 | (6.1) | (0.7)
Change in unamortized pension gain (loss) related to changes in foreign currency, tax | $ 0.1 | $ (0.6) | $ 0.0

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