Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 663.3	$ 684.1	$ 1,379.9	$ 1,449.2
Segment Profit	253.3	253.3	520.3	551.6
Amortization of intangible assets	(14.5)	(14.5)	(29.0)	(30.5)
Restructuring costs	(23.4)	(7.5)	(45.8)	(14.1)
Loss on extinguishment of debt			(0.9)	2.0
December 2023 Argentina Economic Reform (4)	(5.9)	(4.5)	(29.6)	(3.5)
Net (loss)/earnings	42.4	50.4	51.8	112.7
Depreciation and amortization	28.9	30.4	58.9	62.5
ARGENTINA
Segment Reporting Information [Line Items]
December 2023 Argentina Economic Reform (4)	(1.0)		(22.0)
Selling, general and administrate expense | IT enablement
Segment Reporting Information [Line Items]
Restructuring costs	(3.3)	0.0	(7.2)	0.0
Project Momentum Restructuring
Segment Reporting Information [Line Items]
Restructuring costs	(20.1)	(7.5)	(38.6)	(14.1)
Batteries & Lights
Segment Reporting Information [Line Items]
Restructuring costs	(20.5)	(6.8)	(41.2)	(12.6)
Auto Care
Segment Reporting Information [Line Items]
Restructuring costs	(2.9)	(0.7)	(4.6)	(1.5)
Operating Segments
Segment Reporting Information [Line Items]
Segment Profit	153.9	143.9	293.2	292.8
Depreciation and amortization	14.4	15.9	29.9	32.0
Operating Segments | Batteries & Lights
Segment Reporting Information [Line Items]
Net sales	481.0	505.9	1,098.8	1,177.5
Segment Profit	113.5	114.5	245.9	252.8
Depreciation and amortization	11.3	13.1	24.3	26.5
Operating Segments | Auto Care
Segment Reporting Information [Line Items]
Net sales	182.3	178.2	281.1	271.7
Segment Profit	40.4	29.4	47.3	40.0
Depreciation and amortization	3.1	2.8	5.6	5.5
Segment Reconciling Items
Segment Reporting Information [Line Items]
General corporate and other expenses	(28.3)	(27.8)	(57.5)	(53.2)
Amortization of intangible assets	(14.5)	(14.5)	(29.0)	(30.5)
Acquisition and integration costs	0.7	0.0	3.3	0.0
Interest expense	(38.7)	(42.0)	(79.4)	(84.9)
Loss on extinguishment of debt	(0.4)	(0.9)	(0.9)	2.0
Other items, net	(4.5)	(0.8)	(3.5)	0.6
Depreciation and amortization	14.5	14.5	29.0	30.5
Segment Reconciling Items | ARGENTINA
Segment Reporting Information [Line Items]
December 2023 Argentina Economic Reform (4)	(1.0)	0.0	(22.0)	0.0
Segment Reconciling Items | Cost of Sales
Segment Reporting Information [Line Items]
Restructuring costs	(15.5)	(5.7)	(28.3)	(6.0)
Segment Reconciling Items | Selling, general and administrate expense
Segment Reporting Information [Line Items]
Restructuring costs	(4.6)	(1.8)	(10.3)	(8.1)
Segment Reconciling Items | Selling, general and administrate expense | IT enablement
Segment Reporting Information [Line Items]
Restructuring costs	$ (3.3)	$ 0.0	(7.2)	0.0
Segment Reconciling Items | Project Momentum Restructuring
Segment Reporting Information [Line Items]
Restructuring costs			$ (45.8)	$ (14.1)