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Leases - Additional Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 128.4	$ 140.8
Operating cash flows from finance leases	2.7	2.3
Financing cash flows from finance leases	23.8	22.3
Right-of-use assets obtained in exchange for new operating leases	104.5	60.7
Right-of-use assets obtained in exchange for new finance leases	$ 35.0	$ 21.3

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Amount of interest paid on finance lease liability.

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Amount of cash outflow for principal payment on finance lease.

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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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