Accumulated Other Comprehensive Loss, Net (Tables)

12 Months Ended

Sep. 30, 2023

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss for the years ended September 30, 2023, 2022, and 2021.

(in millions)	Foreign Currency Translation Adjustment		Pension Benefits Adjustment		Cash Flow Hedge		Accumulated Other Comprehensive Loss, net
Balances as of September 30, 2020	$	(36.0)	$	(4.1)	$	—	$	(40.1)
Other comprehensive income	13.3		1.5		—		14.8
Amounts reclassified from AOCI, net of tax	—		0.2		—		0.2
Other comprehensive income net of tax	13.3		1.7		—		15.0
Balances as of September 30, 2021	$	(22.7)	$	(2.4)	$	—	$	(25.1)
Other comprehensive loss	(11.7)		(0.3)		(53.5)		(65.5)
Other comprehensive loss net of tax	(11.7)		(0.3)		(53.5)		(65.5)
Balances as of September 30, 2022	$	(34.4)	$	(2.7)	$	(53.5)	$	(90.6)
Other comprehensive income	3.2		0.5		35.1		38.8
Other comprehensive income net of tax	3.2		0.5		35.1		38.8
Balances as of September 30, 2023	$	(31.2)	$	(2.2)	$	(18.4)	$	(51.8)