Business Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Business segment information
Number of reportable segments | segment			3
Total revenue	$ 570.8	$ 424.6	$ 1,125.5	$ 848.6
Operating Income (loss)	85.6	37.9	174.7	54.3
Assets	3,087.0		3,087.0		$ 3,049.0
Eliminations
Business segment information
Total revenue	(2.9)	(3.5)	(6.8)	(7.2)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(15.8)	(8.0)	(32.0)	(24.8)
Assets	(4.9)		(4.9)		(4.2)
BSI Life Science | Operating segments
Business segment information
Total revenue	341.8	257.8	693.6	519.2
Operating Income (loss)	73.6	38.6	162.5	78.1
Assets	2,993.3		2,993.3		2,964.5
BSI NANO | Operating segments
Business segment information
Total revenue	175.3	125.5	329.7	245.6
Operating Income (loss)	21.0	5.0	33.3	(3.0)
BEST
Business segment information
Total revenue	56.6	44.8	109.0	91.0
BEST | Operating segments
Business segment information
Total revenue	56.6	44.8	109.0	91.0
Operating Income (loss)	6.8	$ 2.3	10.9	$ 4.0
Assets	$ 98.6		$ 98.6		$ 88.7