Restructuring Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 23.4	$ 7.5	$ 45.8	$ 14.1
Other Restructuring, Non-Cash Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	20.0		20.0
Batteries & Lights
Restructuring Cost and Reserve [Line Items]
Restructuring costs	20.5	6.8	41.2	12.6
Auto Care
Restructuring Cost and Reserve [Line Items]
Restructuring costs	2.9	$ 0.7	4.6	$ 1.5
Minimum | Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	140.0		140.0
Minimum | Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	75.0		75.0
Maximum | Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	150.0		150.0
Maximum | Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs	$ 85.0		$ 85.0