Restructuring (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2022	Jun. 30, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Termination of capital lease obligation	$ 9.8	$ 9.8
Capital lease obligations, lease termination fee	$ 4.0	$ 4.0		$ 4.0
Gain on finance lease termination			$ 0.0	0.0	$ 4.5
Restructuring costs			91.7	59.7	1.7
Batteries & Lights
Restructuring Cost and Reserve [Line Items]
Restructuring costs			87.0	52.7	1.3
Auto Care
Restructuring Cost and Reserve [Line Items]
Restructuring costs			4.7	$ 7.0	$ 0.4
Other Restructuring, Non-Cash Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost			30.0
Minimum | Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost			180.0
Minimum | Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost			80.0
Maximum | Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost			185.0
Maximum | Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost			$ 90.0