Goodwill and Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill
Balance at the beginning of the period	$ 293.0
Current period additions	13.3
Foreign currency impact	6.5
Balance at the end of the period	312.8
BSI Life Science
Goodwill
Balance at the beginning of the period	84.2
Foreign currency impact	4.4
Balance at the end of the period	88.6
BSI NANO
Goodwill
Balance at the beginning of the period	208.5
Current period additions	13.3
Foreign currency impact	2.1
Balance at the end of the period	223.9
BEST
Goodwill
Balance at the beginning of the period	0.3
Balance at the end of the period	$ 0.3