Leases (Summary of Lease Information) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Leases [Abstract]
Operating lease, right-of-use asset	$ 52.9			$ 52.9		$ 43.5
Short term lease obligation	10.7			10.7		9.1
Noncurrent lease obligation	42.4			42.4		34.6
Total lease obligation	$ 53.1			$ 53.1		$ 43.7
Operating lease, weighted average remaining lease term	10 years			10 years		12 years
Operating lease, weighted average discount rate, percent	6.60%			6.60%		7.20%
Operating lease, expense	$ 3.6	[1]	$ 3.3	$ 11.0	$ 10.4
Right-of-use asset obtained in exchange for operating lease liability	1.1		0.5	18.8	1.1
Operating lease, payments	$ 3.6		$ 3.4	$ 11.0	$ 10.4

[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 excluded from this amount and is not material.