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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill

The changes in the carrying amount of goodwill by segment for the nine months ended September 30, 2019 were as follows ($ in millions):
 
AMS
 
EP
 
Total
Goodwill as of December 31, 2018
$
333.1

 
$
5.0

 
$
338.1

Foreign currency translation adjustments
(2.1
)
 
(0.2
)
 
(2.3
)
Goodwill as of September 30, 2019
$
331.0

 
$
4.8

 
$
335.8