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Goodwill
 6 Months Ended
Jun. 30, 2016
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, 2016 were as follows ($ in millions):
 
Engineered Papers
 
Advanced Materials & Structures
 
Total
Goodwill as of December 31, 2015
$
4.8

 
$
228.5

 
$
233.3

Goodwill adjusted during the period
—

 
0.1

 
0.1

Foreign currency translation adjustments
—

 
(0.9
)
 
(0.9
)
Goodwill as of June 30, 2016
$
4.8

 
$
227.7

 
$
232.5