Leases (Tables)

12 Months Ended

Sep. 30, 2023

Leases [Abstract]

Summary of ROU assets and lease liabilities

	September 30,
	2023		2022
ROU assets:
Other assets	$	7.4	$	7.5
Lease liabilities:
Other current liabilities	$	2.1	$	1.9
Other liabilities	6.1		6.6
Total liabilities	$	8.2	$	8.5

Lessee, operating lease, liability, maturity

Fiscal 2024	$	2.4
Fiscal 2025	2.3
Fiscal 2026	2.3
Fiscal 2027	0.9
Fiscal 2028	0.2
Thereafter	1.0
Total future minimum payments	9.1
Less: Implied interest	(0.9)
Total lease liabilities	$	8.2

Lease, costs and supplemental disclosures

	Year Ended September 30,
	2023	2022	2021
Total operating lease expense	$3.1	$3.8	$3.7
Variable lease expense	0.9	0.9	0.7
Weighted-average remaining lease term	4 years	4 years	5 years
Weighted-average incremental borrowing rate	4.8%	4.6%	4.3%