Business Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business segment information
Number of reportable segments | segment	3
Total revenue	$ 554.7	$ 424.0
Operating Income (loss)	89.1	16.4
Assets	3,034.9		$ 3,049.0
Eliminations
Business segment information
Total revenue	(3.9)	(3.7)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(16.2)	(16.8)
Assets	(5.2)		(4.2)
BSI Life Science | Operating segments
Business segment information
Total revenue	351.8	261.4
Operating Income (loss)	88.9	39.5
Assets	2,947.8		2,964.5
BSI NANO | Operating segments
Business segment information
Total revenue	154.4	120.1
Operating Income (loss)	12.3	(8.0)
BEST
Business segment information
Total revenue	52.4	46.2
BEST | Operating segments
Business segment information
Total revenue	52.4	46.2
Operating Income (loss)	4.1	$ 1.7
Assets	$ 92.3		$ 88.7