Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Balance at the beginning of the period	$ 293.0	$ 275.7	$ 169.8
Current period additions	13.7	19.7	109.0
Foreign currency impact	13.7	(2.4)	(3.1)
Balance at the end of the period	320.4	293.0	275.7
Goodwill, Impairment Loss	3.1
BSI Life Science
Goodwill
Balance at the beginning of the period	84.2	72.0	8.9
Current period additions		13.1	64.1
Foreign currency impact	7.9	(0.9)	(1.0)
Balance at the end of the period	92.1	84.2	72.0
BSI NANO
Goodwill
Balance at the beginning of the period	208.5	203.7	160.9
Current period additions	13.7	6.3	44.9
Foreign currency impact	5.8	(1.5)	(2.1)
Balance at the end of the period	228.0	208.5	$ 203.7
BEST
Goodwill
Balance at the beginning of the period	0.3
Current period additions		0.3
Balance at the end of the period	$ 0.3	$ 0.3