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Goodwill
 6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

The changes in the carrying amount of goodwill by segment for the six months ended June 30, 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
106.2

 
—

 
106.2

Foreign currency translation adjustments
2.6

 
0.2

 
2.8

Goodwill as of June 30, 2017
$
333.6

 
$
4.9

 
$
338.5