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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 188.3	$ 201.8	$ 221.4
Operating cash flows from finance leases	2.5	2.2	2.0
Financing cash flows from finance leases	23.7	19.8	13.7
Right-of-use assets obtained in exchange for new operating leases	96.6	90.9	102.7
Right-of-use assets obtained in exchange for new finance leases	$ 37.5	$ 26.2	$ 28.5

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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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