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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets

The changes in the carrying amount of goodwill by reportable segment were as follows:
($ in millions)
Proprietary Products
Contract-Manufactured Products
Total
Balance, December 31, 2014
$
78.9

$
29.7

$
108.6

Foreign currency translation
(3.8
)
(0.2
)
(4.0
)
Balance, December 31, 2015
75.1

29.5

104.6

Foreign currency translation
(1.4
)
(0.2
)
(1.6
)
Balance, December 31, 2016
$
73.7

$
29.3

$
103.0



As of December 31, 2016, we had no accumulated goodwill impairment losses.

Intangible assets and accumulated amortization as of December 31 were as follows:
 
2016
2015
($ in millions)
Cost
Accumulated Amortization
Net
Cost
Accumulated Amortization
Net
Patents and licensing
$
17.8

$
(13.4
)
$
4.4

$
19.7

$
(12.8
)
$
6.9

Technology
3.3

(0.7
)
2.6

3.4

(0.6
)
2.8

Trademarks
2.0

(1.6
)
0.4

12.0

(1.4
)
10.6

Customer relationships
29.3

(18.3
)
11.0

29.5

(17.7
)
11.8

Customer contracts
10.7

(5.8
)
4.9

10.8

(5.3
)
5.5

 
$
63.1

$
(39.8
)
$
23.3

$
75.4

$
(37.8
)
$
37.6



The cost basis of intangible assets includes a foreign currency translation loss of $0.3 million and $0.9 million for the years ended December 31, 2016 and 2015, respectively. Amortization expense for the years ended December 31, 2016, 2015 and 2014 was $2.6 million, $3.5 million and $4.9 million, respectively. Estimated annual amortization expense for the next five years is as follows: 2017 - $4.1 million, 2018 - $3.5 million, 2019 - $3.6 million, 2020 - $3.6 million and 2021 - $3.5 million. During 2016, as part of our restructuring plan, we recorded within other expense a $2.8 million non-cash asset write-down associated with the discontinued use of a patent and a $10.0 million non-cash asset write-down associated with the discontinued use of an indefinite-lived trademark.