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Goodwill (Tables)
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2017 were as follows ($ in millions):
 
Advanced Materials & Structures
 
Engineered Papers
 
Total
Goodwill as of December 31, 2016
$
224.8

 
$
4.7

 
$
229.5

Goodwill acquired during the period
107.0

 

 
107.0

Foreign currency translation adjustments
0.6

 
(0.1
)
 
0.5

Goodwill as of March 31, 2017
$
332.4

 
$
4.6

 
$
337.0