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Goodwill
 6 Months Ended
Jun. 30, 2018
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, 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
(1.3
)
 
(0.1
)
 
(1.4
)
Goodwill as of June 30, 2018
$
334.8

 
$
5.1

 
$
339.9