Business Segment Information (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Business segment information
Number of reportable segments \| segment			3
Total revenue	$ 511.4	$ 521.1	$ 1,360.0	$ 1,472.7
Operating Income (loss)	81.2	87.8	135.5	183.2
Assets	2,879.4		2,879.4		$ 2,771.5
Eliminations
Business segment information
Total revenue	(2.9)	(3.2)	(10.1)	(10.5)
Corporate, eliminations and other
Business segment information
Operating Income (loss)	(12.8)	(9.8)	(37.6)	(32.7)
Assets	(6.0)		(6.0)		(4.7)
BSI Life Science \| Operating segments
Business segment information
Total revenue	323.4	301.9	842.6	869.3
Operating Income (loss)	80.6	75.7	158.7	178.9
Assets	2,808.9		2,808.9		2,711.6
BSI NANO \| Operating segments
Business segment information
Total revenue	147.1	169.9	392.7	461.7
Operating Income (loss)	12.2	18.3	9.3	27.1
BEST
Business segment information
Total revenue	43.8	52.5	134.8	152.2
BEST \| Operating segments
Business segment information
Total revenue	43.8	52.5	134.8	152.2
Operating Income (loss)	1.2	$ 3.6	5.1	$ 9.9
Assets	$ 76.5		$ 76.5		$ 64.6

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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