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Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill and other intangible assets	$ 2,085.6	$ 2,116.9
Total assets	4,230.2	4,342.4
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	1,691.0	1,773.8
Operating Segments | Batteries & Lights
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	1,291.0	1,421.1
Operating Segments | Auto Care
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	400.0	352.7
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	$ 453.6	$ 451.7

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