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Goodwill
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

The changes in the carrying amount of goodwill by segment for the nine months ended September 30, 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
(2.4
)
 
(0.2
)
 
(2.6
)
Goodwill as of September 30, 2018
$
333.7

 
$
5.0

 
$
338.7