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Business Segment Information - Information by Segment (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business segment information
Number of reportable segments \| segment									4
Total revenue	$ 599.9	$ 521.1	$ 490.2	$ 461.4	$ 553.6	$ 466.6	$ 443.7	$ 431.7	$ 2,072.6	$ 1,895.6	$ 1,765.9
Operating Income (loss)	117.7	$ 87.8	$ 53.5	$ 41.9	106.4	$ 69.1	$ 48.8	$ 38.1	300.9	262.4	219.5
Assets	2,771.5				2,128.6				2,771.5	2,128.6
Capital Expenditures									73.0	49.2	43.7
Depreciation and Amortization									75.6	64.9	63.9
Eliminations
Business segment information
Total revenue									(14.9)	(6.2)	(9.2)
Corporate, eliminations and other
Business segment information
Operating Income (loss)									(46.2)	(44.5)	(24.4)
Assets	(4.7)				(5.2)				$ (4.7)	(5.2)
BSI Life Science
Business segment information
Number of reportable segments \| segment									3
Capital Expenditures									$ 44.4	27.6	22.7
Depreciation and Amortization									30.5	24.0	22.8
BSI Life Science \| Operating segments
Business segment information
Total revenue									1,244.9	1,138.9	1,070.9
Operating Income (loss)									290.3	244.0	212.2
BSI Material Science
Business segment information
Total revenue									632.7	568.1	513.0
Operating Income (loss)									40.4	48.4	24.3
Capital Expenditures									18.5	11.6	10.9
Depreciation and Amortization									35.9	32.2	34.0
BEST
Business segment information
Total revenue									209.9	194.8
Capital Expenditures									5.4	6.4	5.2
Depreciation and Amortization									5.4	4.7	4.1
BEST \| Operating segments
Business segment information
Total revenue									209.9	194.8	191.2
Operating Income (loss)									16.4	14.5	7.4
Assets	64.6				33.2				64.6	33.2
BSI Life Science, BSI Material Science & Corporate \| Operating segments
Business segment information
Assets	$ 2,711.6				$ 2,100.6				2,711.6	2,100.6
Corporate
Business segment information
Capital Expenditures									4.7	3.6	4.9
Depreciation and Amortization									$ 3.8	$ 4.0	$ 3.0