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Leases - Schedule of Operating Lease Costs and Other Related Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Leases [Abstract]
Operating lease costs	$ 47.2	$ 42.9
Cash paid for amounts included in the measurement of operating lease liabilities	30.4	25.8
Right-of-use assets obtained in exchange for operating lease liabilities	$ 26.9	$ 56.4
Weighted average remaining lease term (years)	8 years	8 years 7 months 6 days
Weighted average discount rate (as a percent)	5.20%	5.00%

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Topic 842
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-Section 55
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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