Leases (Summary of Lease Information) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2023		Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Leases [Abstract]
Operating lease, right-of-use asset	$ 49.6			$ 49.6		$ 50.1
Short term lease obligation	9.0			9.0		8.8
Noncurrent lease obligation	41.0			41.0		41.5
Total lease obligation	$ 50.0			$ 50.0		$ 50.3
Operating lease, weighted average remaining lease term	10 years			10 years		10 years
Operating lease, weighted average discount rate, percent	6.70%			6.70%		6.60%
Operating lease, expense	$ 3.1	[1]	$ 3.3	$ 6.1	$ 6.8
Right-of-use asset obtained in exchange for operating lease liability	0.5		2.4	1.5	2.9
Operating lease, payments	$ 3.0		$ 3.3	$ 6.0	$ 6.9

[1] Lease expense is included in Cost of products sold or SG&A expense based on the nature of the lease. Short-term lease expense is not considered material and is, therefore, excluded from this amount.