Revenue - Disaggregation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues disaggregated by Group
Total revenue	$ 1,987.5	$ 2,072.6	$ 1,895.6
Revenue recognized at a point in time
Revenues disaggregated by Group
Total revenue	1,726.7	1,847.4	1,716.8
Revenue recognized over time
Revenues disaggregated by Group
Total revenue	260.8	225.2	178.8
Eliminations
Revenues disaggregated by Group
Total revenue	(12.0)	(14.9)	(6.2)
Operating segments | Bruker BioSpin
Revenues disaggregated by Group
Total revenue	600.0	621.4	591.1
Operating segments | Bruker CALID
Revenues disaggregated by Group
Total revenue	653.9	623.5	547.8
Operating segments | BSI NANO
Revenues disaggregated by Group
Total revenue	556.1	632.7	568.1
Operating segments | BEST
Revenues disaggregated by Group
Total revenue	$ 189.5	$ 209.9	$ 194.8