v3.25.4
Goodwill and intangible assets (Tables)
 3 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table sets forth goodwill by segment as of October 1, 2025 and December 31, 2025:

Batteries & LightsAuto CareTotal
Balance at October 1, 2025$902.7 $148.5 $1,051.2 
Cumulative translation adjustment0.6 (0.5)0.1 
Balance at December 31, 2025$903.3 $148.0 $1,051.3 
Schedule of Finite-Lived Intangible Assets
Total intangible assets at December 31, 2025 were as follows:
Gross Carrying AmountAccumulated AmortizationAccumulated ImpairmentNet Carrying Amount
Trademarks and trade names$155.1 $(48.6)$— $106.5 
Customer relationships395.0 (199.9)(0.6)194.5 
Patents34.6 (23.8)— 10.8 
Proprietary technology172.5 (139.4)— 33.1 
Proprietary formulas29.2 (18.0)(5.3)5.9 
    Total Amortizable intangible assets786.4 (429.7)(5.9)350.8 
Trademarks and trade names - indefinite lived640.8 — — 640.8 
     Total Other intangible assets, net$1,427.2 $(429.7)$(5.9)$991.6 

Total intangible assets at September 30, 2025 were as follows:
Gross Carrying AmountAccumulated AmortizationAccumulated ImpairmentNet Carrying Amount
Trademarks and trade names$155.0 $(46.4)$— $108.6 
Customer relationships395.0 (193.3)(0.6)201.1 
Patents34.5 (23.3)— 11.2 
Proprietary technology172.5 (135.0)— 37.5 
Proprietary formulas29.2 (17.6)(5.3)6.3 
    Total Amortizable intangible assets786.2 (415.6)(5.9)364.7 
Trademarks and trade names - indefinite lived640.8 — — 640.8 
    Total Other intangible assets, net$1,427.0 $(415.6)$(5.9)$1,005.5