Goodwill and Intangible Assets - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill
Balance at the beginning of the period	$ 293.0
Foreign currency impact	(3.0)
Balance at the end of the period	290.0
BSI Life Science
Goodwill
Balance at the beginning of the period	84.2
Foreign currency impact	(0.3)
Balance at the end of the period	83.9
BSI NANO
Goodwill
Balance at the beginning of the period	208.5
Foreign currency impact	(2.7)
Balance at the end of the period	205.8
BEST
Goodwill
Balance at the beginning of the period	0.3
Balance at the end of the period	$ 0.3