Goodwill (Tables)

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by reportable segment for the six months ended June 30, 2021 were as follows ($ in millions):

	AMS		EP		Total
Goodwill as of December 31, 2020	$	398.4	$	5.3	$	403.7
Goodwill acquired during the period	263.1		—		263.1
Foreign currency translation adjustments	0.1		(0.2)		(0.1)
Goodwill as of June 30, 2021	$	661.6	$	5.1	$	666.7