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Goodwill and intangible assets
 3 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and intangible assets Goodwill and intangible assets
Goodwill and intangible assets deemed to have an indefinite life are not amortized, but are evaluated annually for impairment as part of our annual business planning cycle in the fourth fiscal quarter, or when indicators of a potential impairment are present.

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 

Energizer had indefinite-lived intangible assets of $639.9 at December 31, 2024 and $641.6 at September 30, 2024. The difference between the periods is driven by currency adjustments.
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