Restructuring and Impairment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 0.0	$ 11.8	$ 0.0
Other payables and accrued expenses
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 1.1		$ 1.1