Leases - Components of lease expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Operating lease cost
Operating lease cost	$ 43.7	$ 47.2	$ 87.8	$ 94.7
Finance lease cost
Amortization of right-of-use assets	4.6	3.9	8.7	6.4
Interest on lease liabilities	0.6	0.4	1.1	1.2
Variable lease cost	8.3	9.5	16.4	18.7
Total lease cost	$ 57.2	$ 61.0	$ 114.0	$ 121.0

No definition available.

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- Definition

Amount of interest expense on finance lease liability.

+ References

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- Definition

Amount of amortization expense attributable to right-of-use asset from finance lease.

+ References

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- Definition

Amount of lease cost recognized by lessee for lease contract.

+ References

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- References

No definition available.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

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-Publisher FASB
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- Definition

Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

+ References

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