Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Millions		Sep. 30, 2022	Sep. 30, 2021
Payables and Accruals [Abstract]
Payroll related accruals		$ 46.0	$ 70.2
Accrued operating expenses		91.2	84.0
Other accruals (a)	[1]	56.3	66.7
Accrued expenses and other current liabilities		$ 193.5	$ 220.9

[1] Other accruals for the fiscal years ended September 30, 2022 and September 30, 2021 include the Company’s deferral of Federal Insurance Contributions Act (FICA) payroll tax under the CARES Act.