Leases (Tables)

12 Months Ended

Sep. 30, 2021

Leases [Abstract]

Summary of ROU assets and lease liabilities

	September 30,
	2021		2020
ROU assets:
Other assets	$	9.7	$	11.9
Lease liabilities:
Other current liabilities	$	2.3	$	2.2
Other liabilities	8.6		11.0
Total liabilities	$	10.9	$	13.2

Lessee, operating lease, liability, maturity

Fiscal 2022	$	2.8
Fiscal 2023	2.6
Fiscal 2024	2.0
Fiscal 2025	2.0
Fiscal 2026	2.1
Thereafter	0.7
Total future minimum payments	12.2
Less: Implied interest	(1.3)
Total lease liabilities	$	10.9

Lease, costs and supplemental disclosures

	September 30,
	2021		2020
Operating lease expense	3.7		4.0
Variable lease expense	0.7		0.6
Short-term lease expense	—		—
Weighted average remaining lease term	5 years		6 years
Weighted average incremental borrowing rate	4.3	%	4.2	%