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Goodwill
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill

The Company evaluates goodwill for impairment at least annually during the fourth quarter. The annual tests during the fourth quarters of 2018, 2017 and 2016 resulted in no impairment. Each of the Company's two reportable segments, AMS and EP, have goodwill. There are no accumulated impairment losses in the AMS segment as of December 31, 2018. The EP segment has recorded $2.7 million in accumulated impairment losses in previous years.

The changes in the carrying amount of goodwill for each reportable segment 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 year
106.2

 
—

 
106.2

Foreign currency translation adjustments
5.1

 
0.5

 
5.6

Goodwill as of December 31, 2017
$
336.1

 
$
5.2

 
$
341.3

Foreign currency translation adjustments
(3.0
)
 
(0.2
)
 
(3.2
)
Goodwill as of December 31, 2018
$
333.1

 
$
5.0

 
$
338.1