Taxes on Income - Reconciliation of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 133.5	$ 138.8	$ 168.7
Additions for tax positions of prior years	2.5	1.2	6.1
Reductions for tax positions of prior years	(1.2)	(4.9)	(14.9)
Tax positions related to the current year	11.1	12.1	13.3
Settlements with taxing authorities	(17.5)	(6.6)	(19.9)
Expirations of statute of limitations	(16.5)	(7.1)	(14.5)
Balance at End of Year	$ 111.9	$ 133.5	$ 138.8

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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