Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	$ 61.3	$ 43.4	$ 128.6	$ 101.6
Weighted average shares outstanding:
Weighted average shares outstanding-basic	154.2	156.4	155.7	156.1
Effect of dilutive securities:
Stock options and restricted stock awards and units (in shares)	1.4	1.0	1.3	1.1
Weighted average shares outstanding-diluted	155.6	157.4	157.0	157.2
Net income per common share attributable to Bruker Corporation shareholders:
Basic (in dollars per share)	$ 0.40	$ 0.28	$ 0.83	$ 0.65
Diluted (in dollars per share)	$ 0.39	$ 0.28	$ 0.82	$ 0.65