Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share
Redemption value adjustment of the redeemable noncontrolling interest	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Net income attributable to Bruker Corporation, as reported -basic	$ 36.5	$ 31.2	$ 67.3	$ 58.2
Weighted average shares outstanding:
Weighted average shares outstanding-basic	156.1	156.1	156.4	156.0
Effect of dilutive securities:
Stock options and restricted stock awards and units (in shares)	1.5	0.9	1.3	1.0
Weighted average shares outstanding-diluted	157.6	157.0	157.7	157.0
Net income per common share attributable to Bruker Corporation shareholders:
Basic (in dollars per share)	$ 0.23	$ 0.20	$ 0.43	$ 0.37
Diluted (in dollars per share)	$ 0.23	$ 0.20	$ 0.43	$ 0.37