Segments - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net sales	$ 699.4	$ 728.0	$ 2,148.6	$ 2,259.7
Segment Profit	265.1	284.0	816.7	834.0
Amortization of intangible assets	(14.5)	(15.4)	(45.0)	(45.8)
Restructuring costs	(9.1)	4.5	(23.2)	(0.8)
Gain on finance lease termination			0.0	4.5
Loss on extinguishment of debt	(0.3)	0.0	1.7	0.0
Net (loss)/earnings	40.4	65.1	153.1	169.6
Depreciation and amortization	30.5	30.4	93.0	89.0
Costs of products sold
Segment Reporting Information [Line Items]
Acquisition and integration costs				6.0
Selling, general and administrate expense
Segment Reporting Information [Line Items]
Acquisition and integration costs					$ 9.4
Selling, general and administrate expense | IT Enablement
Segment Reporting Information [Line Items]
Restructuring costs	(0.2)	0.0	(0.2)	0.0
Nonoperating Income (Expense)
Segment Reporting Information [Line Items]
Exit of Russian market	0.0	0.0	0.0	(7.5)
Gain on finance lease termination	0.0	4.5	0.0	4.5
Research and development expense
Segment Reporting Information [Line Items]
Acquisition and integration costs		1.1		1.1
Other Nonoperating Income (Expense)
Segment Reporting Information [Line Items]
Gain on finance lease termination		4.5		4.5
Project Momentum Restructuring
Segment Reporting Information [Line Items]
Restructuring costs	(8.9)	0.0	(23.0)	0.0
Project Momentum Restructuring | Other Nonoperating Income (Expense)
Segment Reporting Information [Line Items]
Restructuring costs	0.2		0.2
Exit Of Russian Market | Costs of products sold
Segment Reporting Information [Line Items]
Exit of Russian market		(0.7)
Exit Of Russian Market | Selling, general and administrate expense
Segment Reporting Information [Line Items]
Exit of Russian market		(5.8)
Exit Of Russian Market | Other Expense
Segment Reporting Information [Line Items]
Exit of Russian market		(7.5)
Exit Of Russian Market | Other Nonoperating Income (Expense)
Segment Reporting Information [Line Items]
Exit of Russian market		(7.5)		(7.5)
Exit Of Russian Market | Segment Reconciling Items
Segment Reporting Information [Line Items]
Exit of Russian market	0.0	0.0	0.0	(14.0)
Batteries & Lights
Segment Reporting Information [Line Items]
Restructuring costs	(8.3)		(20.9)	(0.6)
Auto Care
Segment Reporting Information [Line Items]
Restructuring costs	(0.8)		(2.3)	(0.2)
Operating Segments
Segment Reporting Information [Line Items]
Segment Profit	139.3	155.6	432.1	443.4
Depreciation and amortization	16.0	15.0	48.0	43.2
Operating Segments | Batteries & Lights
Segment Reporting Information [Line Items]
Net sales	511.3	531.6	1,688.8	1,788.3
Segment Profit	121.9	142.7	374.7	406.4
Depreciation and amortization	13.0	12.5	39.5	36.4
Operating Segments | Auto Care
Segment Reporting Information [Line Items]
Net sales	188.1	196.4	459.8	471.4
Segment Profit	17.4	12.9	57.4	37.0
Depreciation and amortization	3.0	2.5	8.5	6.8
Segment Reconciling Items
Segment Reporting Information [Line Items]
General corporate and other expenses	(27.4)	(27.6)	(80.6)	(74.9)
Amortization of intangible assets	(14.5)	(15.4)	(45.0)	(45.8)
Restructuring costs	(9.1)	0.0	(23.2)	0.0
Acquisition and integration costs	0.0	0.0	0.0	16.5
Acquisition earn out	0.0	0.0	0.0	(1.1)
Interest expense	(42.2)	(41.1)	(127.1)	(116.4)
Gain on finance lease termination	0.0	4.5	0.0	4.5
infrequent charges	0.0	(9.9)	0.0	(9.9)
Loss on extinguishment of debt	(0.3)	0.0	1.7	0.0
Other items, net	(5.4)	(1.0)	(4.8)	0.3
Depreciation and amortization	14.5	15.4	45.0	45.8
Segment Reconciling Items | Costs of products sold
Segment Reporting Information [Line Items]
Restructuring costs	(6.5)	0.0	(12.5)	0.0
Segment Reconciling Items | Selling, general and administrate expense
Segment Reporting Information [Line Items]
Restructuring costs	(2.6)	0.0	(10.7)	0.0
Segment Reconciling Items | Selling, general and administrate expense | IT Enablement
Segment Reporting Information [Line Items]
Restructuring costs	(0.2)	0.0	(0.2)	0.0
Segment Reconciling Items | Nonoperating Income (Expense)
Segment Reporting Information [Line Items]
Restructuring costs	0.2	0.0	0.2	0.0
Segment Reconciling Items | Project Momentum Restructuring
Segment Reporting Information [Line Items]
Restructuring costs	$ (9.1)	$ 0.0	$ (23.2)	$ 0.0