Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Net income attributable to Bruker Corporation, as reported -basic	$ 37.0	$ 46.5	$ 82.0	$ 84.6
Net income attributable to Bruker Corporation, as reported -diluted	$ 37.0	$ 46.5	$ 82.0	$ 84.6
Weighted average shares outstanding:
Weighted average shares outstanding-basic	157.5	160.8	158.9	161.8
Effect of dilutive securities:
Stock options and restricted stock (in shares)	1.2	0.7	1.0	0.9
Weighted average shares outstanding-diluted	158.7	161.5	159.9	162.7
Net income per common share attributable to Bruker Corporation shareholders:
Basic (in dollars per share)	$ 0.23	$ 0.29	$ 0.52	$ 0.52
Diluted (in dollars per share)	$ 0.23	$ 0.29	$ 0.51	$ 0.52