Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Balance at the beginning of the period	$ 275.7	$ 169.8	$ 130.6
Current period additions			33.8
Current period additions/adjustments	19.7	109.0
Goodwill impairment charges	3.1
Foreign currency impact	(2.4)	(3.1)	5.4
Balance at the end of the period	293.0	275.7	169.8
Impairment of goodwill	3.1
BSI Life Science
Goodwill
Balance at the beginning of the period	72.0	8.9	4.5
Current period additions			3.7
Current period additions/adjustments	13.1	64.1
Foreign currency impact	(0.9)	(1.0)	0.7
Balance at the end of the period	84.2	72.0	8.9
BSI NANO
Goodwill
Balance at the beginning of the period	203.7	160.9	126.1
Current period additions			30.1
Current period additions/adjustments	6.3	44.9
Foreign currency impact	(1.5)	(2.1)	4.7
Balance at the end of the period	208.5	$ 203.7	$ 160.9
BEST
Goodwill
Current period additions/adjustments	0.3
Balance at the end of the period	$ 0.3