v3.25.2
Goodwill and intangible assets (Tables)
 9 Months Ended
Jun. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table sets forth goodwill by segment as of October 1, 2024 and June 30, 2025:

Batteries & LightsAuto CareTotal
Balance at October 1, 2024$897.9 $148.1 $1,046.0 
Centralsul Acquisition— 0.1 0.1 
Cumulative translation adjustment3.9 0.1 4.0 
Balance at June 30, 2025$901.8 $148.3 $1,050.1 
Schedule of Finite-Lived Intangible Assets
Total intangible assets at June 30, 2025 are as follows:
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$155.2 $(44.4)$110.8 
Customer relationships395.2 (186.9)208.3 
Patents34.7 (22.9)11.8 
Proprietary technology172.5 (130.6)41.9 
Proprietary formulas29.2 (16.7)12.5 
    Total Amortizable intangible assets786.8 (401.5)385.3 
Trademarks and trade names - indefinite lived640.9 — 640.9 
     Total Other intangible assets, net$1,427.7 $(401.5)$1,026.2 

Total intangible assets at September 30, 2024 were as follows:
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$155.0 $(37.8)$117.2 
Customer relationships395.0 (166.8)228.2 
Patents34.5 (21.0)13.5 
Proprietary technology172.5 (117.5)55.0 
Proprietary formulas29.2 (13.8)15.4 
    Total Amortizable intangible assets786.2 (356.9)429.3 
Trademarks and trade names - indefinite lived641.6 — 641.6 
    Total Other intangible assets, net$1,427.8 $(356.9)$1,070.9