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Goodwill
3 Months Ended
Mar. 31, 2019
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, 2019 were as follows ($ in millions):
 
Advanced Materials & Structures
 
Engineered Papers
 
Total
Goodwill as of December 31, 2018
$
333.1

 
$
5.0

 
$
338.1

Foreign currency translation adjustments
0.3

 
(0.1
)
 
0.2

Goodwill as of March 31, 2019
$
333.4

 
$
4.9

 
$
338.3