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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
Advanced Materials & Structures
 
Engineered Papers
 
Total
Goodwill as of December 31, 2015
$
228.5

 
$
4.8

 
$
233.3

Goodwill adjusted during the year
(0.2
)
 
—

 
(0.2
)
Foreign currency translation adjustments
(3.5
)
 
(0.1
)
 
(3.6
)
Goodwill as of December 31, 2016
$
224.8

 
$
4.7

 
$
229.5

Goodwill acquired during the year
106.2

 
—

 
106.2

Foreign currency translation adjustments
5.1

 
0.5

 
5.6

Goodwill as of December 31, 2017
$
336.1

 
$
5.2

 
$
341.3