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Leases - Additional cash flow information (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 165.9	$ 168.3
Operating cash flows from finance leases	1.5	1.3
Financing cash flows from finance leases	10.1	11.9
Right-of-use assets obtained in exchange for new operating leases	77.3	90.8
Right-of-use assets obtained in exchange for new finance leases	$ 22.2	$ 17.5

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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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