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Goodwill and intangible assets
 6 Months Ended
Mar. 31, 2021
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, 2020 and March 31, 2021:

AmericasInternationalTotal
Balance at October 1, 2020$865.8 $150.2 $1,016.0 
Formulations Acquisition29.2 — 29.2 
Cumulative translation adjustment0.4 11.9 12.3 
Balance at March 31, 2021$895.4 $162.1 $1,057.5 

Energizer had indefinite-lived intangible assets of $1,366.4 at March 31, 2021 and $1,365.4 at September 30, 2020. The difference between the periods is driven by currency adjustments.
Total intangible assets at March 31, 2021 are as follows:

Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$59.7 $(15.8)$43.9 
Customer relationships395.2 (74.1)321.1 
Patents34.5 (12.1)22.4 
Proprietary technology172.5 (48.6)123.9 
Proprietary formulas21.9 (1.5)20.4 
Non-compete0.5 (0.5)— 
Vendor relationships8.0 (3.4)4.6 
    Total Amortizable intangible assets692.3 (156.0)536.3 
Trademarks and trade names - indefinite lived1,366.4 — 1,366.4 
     Total Other intangible assets, net$2,058.7 $(156.0)$1,902.7 

Total intangible assets at September 30, 2020 were as follows:

Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Trademarks and trade names$59.7 $(13.9)$45.8 
Customer relationships394.2 (60.8)333.4 
Patents34.5 (10.8)23.7 
Proprietary technology172.5 (37.6)134.9 
Proprietary formulas2.4 (0.5)1.9 
Non-compete0.5 (0.4)0.1 
Vendor relationships5.0 (1.2)3.8 
    Total Amortizable intangible assets668.8 (125.2)543.6 
Trademarks and trade names - indefinite lived1,365.4 — 1,365.4 
    Total Other intangible assets, net$2,034.2 $(125.2)$1,909.0