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Intangible Assets
12 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
11.  INTANGIBLE ASSETS
The table below provides details of acquired intangible assets:
 
 
30 September 2016
 
30 September 2015
 
 
Gross

 
Accumulated
Amortization/
Impairment

 
Net

 
Gross

 
Accumulated
Amortization/
Impairment

 
Net

Customer relationships
 
$
400.6

 
$
(118.2
)
 
$
282.4

 
$
391.5

 
$
(98.8
)
 
$
292.7

Patents and technology
 
13.6

 
(10.1
)
 
3.5

 
13.9

 
(9.9
)
 
4.0

Other
 
73.0

 
(33.7
)
 
39.3

 
72.9

 
(31.4
)
 
41.5

Total finite-lived intangibles
 
487.2

 
(162.0
)
 
325.2

 
478.3

 
(140.1
)
 
338.2

Trade names and trademarks, indefinite-lived
 
66.2

 
(3.5
)
 
62.7

 
63.4

 
(3.3
)
 
60.1

Total Intangible Assets
 
$
553.4

 
$
(165.5
)
 
$
387.9

 
$
541.7

 
$
(143.4
)
 
$
398.3


The decrease in net intangible assets from 2015 to 2016 is primarily due to amortization. Amortization expense for intangible assets was $22.3, $24.0, and $27.1 in 2016, 2015, and 2014, respectively. Refer to Note 1, Major Accounting Policies, for amortization periods associated with our intangible assets.
In the fourth quarter of 2016, we conducted our annual impairment test of indefinite-lived intangibles and found no indications of impairment.
In the fourth quarter of 2014, we conducted our annual impairment test of indefinite-lived intangibles utilizing the royalty savings method, a form of the income approach. We determined that the carrying value of trade names and trademarks were in excess of their fair value, and as a result, we recorded an impairment charge of $4.9 to reduce these assets to their fair value. This impairment is reflected within “Goodwill and intangible asset impairment charge” on our consolidated income statements. These trade names and trademarks are included in our Industrial Gases – Americas segment.
Projected annual amortization expense for intangible assets as of 30 September 2016 is as follows:
 
 
2017
$
20.7

2018
19.9

2019
19.6

2020
19.4

2021
18.7

Thereafter
226.9

Total
$
325.2