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Leases - Additional Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 85.2	$ 92.7
Operating cash flows from finance leases	1.8	1.6
Financing cash flows from finance leases	15.7	15.1
Right-of-use assets obtained in exchange for new operating leases	56.6	38.0
Right-of-use assets obtained in exchange for new finance leases	$ 26.9	$ 17.9

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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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