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Goodwill and intangible assets (Tables)
 3 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table sets forth goodwill by segment as of October 1, 2024 and December 31, 2024:

Batteries & LightsAuto CareTotal
Balance at October 1, 2024$897.9 $148.1 $1,046.0 
Centralsul Acquisition— 0.1 0.1 
Cumulative translation adjustment(12.9)(1.6)(14.5)
Balance at December 31, 2024$885.0 $146.6 $1,031.6 
Schedule of Finite-Lived Intangible Assets
Total intangible assets at December 31, 2024 are as follows:
Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$154.5 $(39.7)$114.8 
Customer relationships394.4 (173.0)221.4 
Patents34.1 (21.2)12.9 
Proprietary technology172.5 (121.9)50.6 
Proprietary formulas29.2 (14.8)14.4 
    Total Amortizable intangible assets784.7 (370.6)414.1 
Trademarks and trade names - indefinite lived639.9 — 639.9 
     Total Other intangible assets, net$1,424.6 $(370.6)$1,054.0 

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