Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share
Net income attributable to Bruker Corporation, as reported -basic	$ 31.2	$ 23.4	$ 58.2	$ 45.0
Weighted average shares outstanding:
Weighted average shares outstanding-basic	156.1	159.5	156.0	159.6
Effect of dilutive securities:
Stock options and restricted stock awards and units (in shares)	0.9	0.9	1.0	0.8
Weighted average shares outstanding-diluted	157.0	160.4	157.0	160.4
Net income per common share attributable to Bruker Corporation shareholders:
Basic (in dollars per share)	$ 0.20	$ 0.15	$ 0.37	$ 0.28
Diluted (in dollars per share)	$ 0.20	$ 0.15	$ 0.37	$ 0.28