Segments - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Goodwill and other intangible assets	$ 2,276.2	$ 2,298.9
Total assets	4,505.1	4,572.1
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	1,767.5	1,819.7
Operating Segments | Batteries & Lights
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	1,334.8	1,366.0
Operating Segments | Auto Care
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	432.7	453.7
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Tangible assets	$ 461.4	$ 453.5