Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 716.6	$ 765.1
Segment Profit	267.0	298.3
Amortization of intangible assets	(14.5)	(16.0)
Restructuring costs	(22.4)	(6.6)
Loss on extinguishment of debt	(0.5)	2.9
December 2023 Argentina Economic Reform (4)	(23.7)	1.0
Net (loss)/earnings	9.4	62.3
Depreciation and amortization	30.0	32.1
ARGENTINA
Segment Reporting Information [Line Items]
December 2023 Argentina Economic Reform (4)	(21.0)
Cost of Sales
Segment Reporting Information [Line Items]
Restructuring costs	(12.8)	(0.3)
Selling, general and administrate expense
Segment Reporting Information [Line Items]
Restructuring costs	(5.7)	(6.3)
Selling, general and administrate expense | IT enablement
Segment Reporting Information [Line Items]
Restructuring costs	(3.9)	0.0
Project Momentum Restructuring
Segment Reporting Information [Line Items]
Restructuring costs	(18.5)	(6.6)
Batteries & Lights
Segment Reporting Information [Line Items]
Restructuring costs	(20.8)	(5.8)
Auto Care
Segment Reporting Information [Line Items]
Restructuring costs	(1.6)	(0.8)
Operating Segments
Segment Reporting Information [Line Items]
Segment Profit	139.3	148.9
Depreciation and amortization	15.5	16.1
Operating Segments | Batteries & Lights
Segment Reporting Information [Line Items]
Net sales	617.8	671.6
Segment Profit	132.4	138.3
Depreciation and amortization	13.0	13.4
Operating Segments | Auto Care
Segment Reporting Information [Line Items]
Net sales	98.8	93.5
Segment Profit	6.9	10.6
Depreciation and amortization	2.5	2.7
Segment Reconciling Items
Segment Reporting Information [Line Items]
General corporate and other expenses	(29.2)	(25.4)
Amortization of intangible assets	(14.5)	(16.0)
Acquisition and integration costs	2.6	0.0
Interest expense	(40.7)	(42.9)
Loss on extinguishment of debt	(0.5)	2.9
Other items, net	1.0	1.4
Depreciation and amortization	14.5	16.0
Segment Reconciling Items | ARGENTINA
Segment Reporting Information [Line Items]
December 2023 Argentina Economic Reform (4)	$ (21.0)	$ 0.0