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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 46.2	$ 49.0
Operating cash flows from finance leases	0.8	0.6
Financing cash flows from finance leases	7.6	5.4
Right-of-use assets obtained in exchange for new operating leases	11.6	26.9
Right-of-use assets obtained in exchange for new finance leases	$ 11.5	$ 10.8

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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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