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Goodwill and intangible assets
3 Months Ended
Dec. 31, 2018
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, 2018 and December 31, 2018:
 
Americas
 
International
 
Total
Balance at October 1, 2018
$
228.4

 
$
15.8

 
$
244.2

Cumulative translation adjustment
(0.1
)
 
(0.1
)
 
(0.2
)
Balance at December 31, 2018
$
228.3

 
$
15.7

 
$
244.0



Energizer had indefinite-lived intangible assets of $76.7 at December 31, 2018 and $76.9 at September 30, 2018. Changes in indefinite-lived intangible assets are due to changes in foreign currency translation.

Total amortizable intangible assets at December 31, 2018 are as follows:
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Trademarks
$
44.3

 
$
6.8

 
$
37.5

Customer relationships
99.6

 
15.1

 
84.5

Patents
34.5

 
6.4

 
28.1

Proprietary formulas
2.4

 
0.1

 
2.3

Non-compete
0.5

 
0.3

 
0.2

Total intangible assets at December 31, 2018
$
181.3

 
$
28.7

 
$
152.6


Total amortizable intangible assets at September 30, 2018 were as follows:
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Trademarks
$
44.3

 
$
6.1

 
$
38.2

Customer relationships
99.6

 
13.4

 
86.2

Patents
34.5

 
5.7

 
28.8

Proprietary formulas
2.4

 
0.1

 
2.3

Non-compete
0.5

 
0.2

 
0.3

Total intangible assets at September 30, 2018
$
181.3

 
$
25.5

 
$
155.8