Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2024

Accounting Policies [Abstract]

Property, net

	September 30,
	2024		2023
Land and land improvements	$	0.8	$	0.7
Buildings and leasehold improvements	4.5		5.6
Machinery and equipment	14.3		14.1
Software	1.2		2.4
Construction in progress	0.6		1.2
	21.4		24.0
Accumulated depreciation	(12.2)		(15.5)
Property, net	$	9.2	$	8.5

Carrying amount of goodwill

Goodwill, gross	$	180.7
Accumulated impairment losses	(114.8)
Goodwill	$	65.9

Schedule of finite-lived intangible assets

	September 30, 2024						September 30, 2023
	Carrying Amount		Accumulated Amortization		Net Amount		Carrying Amount		Accumulated Amortization		Net Amount
Customer relationships	$	160.7	$	(94.6)	$	66.1	$	178.4	$	(97.2)	$	81.2
Trademarks and brands	164.4		(88.7)		75.7		194.0		(98.4)		95.6
Other intangible assets	3.1		(3.1)		—		3.1		(3.1)		—
Intangible assets, net	$	328.2	$	(186.4)	$	141.8	$	375.5	$	(198.7)	$	176.8