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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill for each reportable segment were as follows ($ in millions):
 
Engineered Papers
 
Advanced Materials & Structures
 
Total
Goodwill as of December 31, 2013
$
6.0

 
$
115.1

 
$
121.1

Goodwill acquired during the year
—

 
5.6

 
5.6

Foreign currency translation adjustments
(0.7
)
 
0.1

 
(0.6
)
Goodwill as of December 31, 2014
5.3

 
120.8

 
126.1

Goodwill acquired during the year
—

 
109.5

 
109.5

Foreign currency translation adjustments
(0.5
)
 
(1.8
)
 
(2.3
)
Goodwill as of December 31, 2015
$
4.8

 
$
228.5

 
$
233.3