v3.26.1
Segments (Segment Reporting Information - Corporate Assets and Capital Expenditures) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Segment Reporting [Line Items]          
Assets $ 4,466.0   $ 4,466.0   $ 4,556.7
Depreciation and amortization     92.6 $ 94.6  
Amortization of intangible assets 12.5 $ 14.7 39.0 44.1  
Operating Segments          
Segment Reporting [Line Items]          
Assets 2,009.9   2,009.9   2,013.3
Capital expenditures 9.1 13.5 52.1 69.1  
Depreciation and amortization 17.4 17.2 53.6 50.5  
Operating Segments | Batteries & Lights          
Segment Reporting [Line Items]          
Assets 1,636.6   1,636.6   1,631.0
Capital expenditures 8.5 12.6 50.6 66.5  
Depreciation and amortization 13.5 13.7 43.2 40.6  
Operating Segments | Auto Care          
Segment Reporting [Line Items]          
Assets 373.3   373.3   382.3
Capital expenditures 0.6 0.9 1.5 2.6  
Depreciation and amortization 3.9 3.5 10.4 9.9  
Corporate          
Segment Reporting [Line Items]          
Assets 440.9   440.9   486.7
Goodwill and other intangible assets, net 2,015.2   2,015.2   $ 2,056.7
Amortization of intangible assets $ 12.5 $ 14.7 $ 39.0 $ 44.1