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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
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, 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

Foreign currency translation
3.9

 
0.8

 
4.7

Balance, December 31, 2017
$
77.6

 
$
30.1

 
$
107.7
Schedule of Intangible Assets by Major Class
Intangible assets and accumulated amortization as of December 31 were as follows:
 
2017
 
2016
($ in millions)
Cost
 
Accumulated Amortization
 
Net
 
Cost
 
Accumulated Amortization
 
Net
Patents and licensing
$
18.2

 
$
(14.1
)
 
$
4.1

 
$
17.8

 
$
(13.4
)
 
$
4.4

Technology
3.3

 
(1.0
)
 
2.3

 
3.3

 
(0.7
)
 
2.6

Trademarks
2.0

 
(1.7
)
 
0.3

 
2.0

 
(1.6
)
 
0.4

Customer relationships
29.3

 
(19.1
)
 
10.2

 
29.3

 
(18.3
)
 
11.0

Customer contracts
11.1

 
(6.3
)
 
4.8

 
10.7

 
(5.8
)
 
4.9

 
$
63.9

 
$
(42.2
)
 
$
21.7

 
$
63.1

 
$
(39.8
)
 
$
23.3