Number of shares issued for each share of convertible preferred stock that is converted.

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Restructuring Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
Restructuring Narrative (Details) - USD ($) $ in Millions	May 08, 2023	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 7.5		$ 0.0	$ 14.1	$ 5.3
Convertible preferred stock, shares issued upon conversion (in shares)				2.1739		2.1739
Senior Secured Term Loan B Facility due 2027
Restructuring Cost and Reserve [Line Items]
Write-off of deferred financing fees		0.9	$ 0.2
Senior Secured Term Loan B Facility due 2027 \| Secured Debt
Restructuring Cost and Reserve [Line Items]
Premiums paid on extinguishment of debt		100.0	$ 25.0
Senior Secured Term Loan B Facility due 2027 \| Secured Debt \| Subsequent Event
Restructuring Cost and Reserve [Line Items]
Premiums paid on extinguishment of debt	$ 30.0
Other Restructuring, Non-Cash Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		10.0			10.0
Batteries & Lights
Restructuring Cost and Reserve [Line Items]
Restructuring costs		6.8			12.6	$ 5.1
Auto Care
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0.7			1.5	0.2
2019 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0.0		$ 0.0	0.0	3.9
2020 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs		0.0		$ 0.0	0.0	$ 1.4
Minimum \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		40.0			40.0
Minimum \| Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		35.0			35.0
Maximum \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		50.0			50.0
Maximum \| Capital Expenditures
Restructuring Cost and Reserve [Line Items]
Expected restructuring costs		$ 45.0			$ 45.0