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Goodwill
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

The changes in the carrying amount of goodwill by segment for the three months ended March 31, 2018 were as follows ($ in millions):
 
Advanced Materials & Structures
 
Engineered Papers
 
Total
Goodwill as of December 31, 2017
$
336.1

 
$
5.2

 
$
341.3

Foreign currency translation adjustments
1.8

 
0.1

 
1.9

Goodwill as of March 31, 2018
$
337.9

 
$
5.3

 
$
343.2