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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 140.8	$ 141.7
Operating cash flows from finance leases	2.3	1.9
Financing cash flows from finance leases	22.3	17.8
Right-of-use assets obtained in exchange for new operating leases	60.7	84.2
Right-of-use assets obtained in exchange for new finance leases	$ 21.3	$ 26.7

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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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