Business Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business segment information
Number of reportable segments | segment			3
Total revenue	$ 608.9	$ 511.4	$ 1,734.4	$ 1,360.0
Operating Income (loss)	113.2	81.2	287.9	135.5
Assets	3,127.7		3,127.7		$ 3,049.0
Eliminations
Business segment information
Total revenue	(3.7)	(2.9)	(10.5)	(10.1)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(16.9)	(12.8)	(48.9)	(37.6)
Assets	(6.2)		(6.2)		(4.2)
BSI Life Science | Operating segments
Business segment information
Total revenue	380.7	323.4	1,074.3	842.6
Operating Income (loss)	100.9	80.6	263.4	158.7
Assets	3,038.8		3,038.8		2,964.5
BSI NANO | Operating segments
Business segment information
Total revenue	174.9	147.1	504.6	392.7
Operating Income (loss)	21.8	12.2	55.1	9.3
BEST
Business segment information
Total revenue	57.0	43.8	166.0	134.8
BEST | Operating segments
Business segment information
Total revenue	57.0	43.8	166.0	134.8
Operating Income (loss)	7.4	$ 1.2	18.3	$ 5.1
Assets	$ 95.1		$ 95.1		$ 88.7