Business Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Business segment information
Number of reportable segments | segment	3
Total revenue	$ 424.0	$ 461.4
Operating Income (loss)	16.4	41.9
Assets	2,961.9		$ 2,771.5
Eliminations
Business segment information
Total revenue	(3.7)	(3.2)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(16.8)	(11.3)
Assets	(4.8)		(4.7)
BSI Life Science | Operating segments
Business segment information
Total revenue	261.4	276.0
Operating Income (loss)	39.5	46.9
Assets	2,899.1		2,711.6
BSI NANO | Operating segments
Business segment information
Total revenue	120.1	140.8
Operating Income (loss)	(8.0)	3.2
BEST
Business segment information
Total revenue	46.2	47.8
BEST | Operating segments
Business segment information
Total revenue	46.2	47.8
Operating Income (loss)	1.7	$ 3.1
Assets	$ 67.6		$ 64.6