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Goodwill (Tables)
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
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, 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

Foreign currency translation adjustments
(0.6
)
 
(0.1
)
 
(0.7
)
Goodwill as of December 31, 2019
$
332.5

 
$
4.9

 
$
337.4