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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 141.7	$ 152.5
Operating cash flows from finance leases	1.9	1.7
Financing cash flows from finance leases	17.8	14.7
Right-of-use assets obtained in exchange for new operating leases	84.2	53.3
Right-of-use assets obtained in exchange for new finance leases	$ 26.7	$ 22.7

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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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