Restructuring Charges (Schedule of Charges Related to Restructuring Activities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 1.3	$ 1.0	$ 4.1	$ 4.0
Other Restructuring Costs	1.7	2.6	4.7	5.4
Restructuring and related costs	3.1	3.9	9.1	9.8
Restructuring Reserve	1.2		1.2		$ 2.5
Asset Impairment and Accelerated Depreciation	0.1	$ 0.3	0.3	$ 0.4
Asset Impairment and Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs			0.3
Restructuring Reserve	$ 0.0		$ 0.0		$ 0.0