Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
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

Other comprehensive income loss general hedge gain loss before reclassification tax provision benefit amount.

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- Definition

Other comprehensive income loss pension and other postretirement benefit plans net unamortized gain loss of foreign currency arising during period tax.

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- Definition

Amount, after reclassification adjustment, of tax expense (benefit) for gain (loss) in value of unsold investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.

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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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