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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 92.7	$ 94.8
Operating cash flows from finance leases	1.6	1.2
Financing cash flows from finance leases	15.1	11.3
Right-of-use assets obtained in exchange for new operating leases	38.0	66.4
Right-of-use assets obtained in exchange for new finance leases	$ 17.9	$ 19.6

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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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