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Goodwill
 3 Months Ended
Mar. 31, 2020
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, 2020 were as follows ($ in millions):
 
AMS
 
EP
 
Total
Goodwill as of December 31, 2019
$
332.5

 
$
4.9

 
$
337.4

Goodwill acquired during the period
60.4

 
—

 
60.4

Foreign currency translation adjustments
(1.2
)
 
(0.1
)
 
(1.3
)
Goodwill as of March 31, 2020
$
391.7

 
$
4.8

 
$
396.5