v3.25.4
Segments (Segment Reporting Information - Corporate Assets and Capital Expenditures) (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Segment Reporting Information [Line Items]      
Assets $ 4,443.6   $ 4,556.7
Depreciation and amortization 31.6 $ 31.8  
Amortization of intangible assets 14.0 14.7  
Operating Segments      
Segment Reporting Information [Line Items]      
Assets 1,939.8   2,013.3
Capital expenditures 25.3 34.6  
Depreciation and amortization 17.6 17.1  
Operating Segments | Batteries & Lights      
Segment Reporting Information [Line Items]      
Assets 1,583.5   1,631.0
Capital expenditures 25.1 34.0  
Depreciation and amortization 14.7 14.3  
Operating Segments | Auto Care      
Segment Reporting Information [Line Items]      
Assets 356.3   382.3
Capital expenditures 0.2 0.6  
Depreciation and amortization 2.9 2.8  
Corporate      
Segment Reporting Information [Line Items]      
Assets 460.9   486.7
Goodwill and other intangible assets, net 2,042.9   $ 2,056.7
Amortization of intangible assets $ 14.0 $ 14.7