Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Unrecognized Tax Benefits
Balance at beginning of year	$ 96.5	$ 103.5	$ 140.3
Additions for tax positions of the current year	14.6	10.9	7.4
Additions for tax positions of prior years	1.4	1.2	6.6
Reductions for tax positions of prior years	(0.3)	(6.0)	(15.4)
Settlements	(3.7)	(3.9)	(0.6)
Statute of limitations expiration	(9.9)	(10.6)	(25.5)
Foreign Currency Translation Increases	2.4	1.4
Foreign Currency Translation Decreases			(9.3)
Balance at end of year	$ 101.0	$ 96.5	$ 103.5

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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-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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

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