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Goodwill and intangible assets
 9 Months Ended
Jun. 30, 2020
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, 2019 and June 30, 2020:

AmericasInternationalTotal
Balance at October 1, 2019$861.6  $143.2  $1,004.8  
Battery Acquisition0.7  0.2  0.9  
Auto Care Acquisition3.8  0.1  3.9  
Cumulative translation adjustment(0.3) (0.6) (0.9) 
Balance at June 30, 2020$865.8  $142.9  $1,008.7  

Energizer had indefinite-lived intangible assets of $1,364.9 at June 30, 2020 and $1,363.8 at September 30, 2019. The difference between the periods is driven by currency adjustments.
Total intangible assets at June 30, 2020 are as follows:

Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$59.7  $(12.9) $46.8  
Customer relationships394.2  (54.2) 340.0  
Patents34.5  (10.2) 24.3  
Proprietary technology172.5  (32.1) 140.4  
Proprietary formulas2.4  (0.4) 2.0  
Non-compete0.5  (0.4) 0.1  
Vendor relationships5.7  (0.8) 4.9  
    Total Amortizable intangible assets669.5  (111.0) 558.5  
Trademarks and trade names - indefinite lived1,364.9  —  1,364.9  
     Total Other intangible assets, net$2,034.4  $(111.0) $1,923.4  

Total intangible assets at September 30, 2019 were as follows:

Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$59.7  $(9.9) $49.8  
Customer relationships394.2  (34.3) 359.9  
Patents34.5  (8.2) 26.3  
Proprietary technology172.5  (15.7) 156.8  
Proprietary formulas2.4  (0.3) 2.1  
Non-compete0.5  (0.3) 0.2  
    Total Amortizable intangible assets663.8  (68.7) 595.1  
Trademarks and trade names - indefinite lived1,363.8  —  1,363.8  
    Total Other intangible assets, net$2,027.6  $(68.7) $1,958.9