Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share
Net income attributable to Bruker Corporation, as reported -basic	$ 11.8	$ 5.5	$ 40.2	$ 30.6
Weighted average shares outstanding:
Weighted average shares outstanding-basic	167.8	168.0	168.2	167.5
Effect of dilutive securities:
Stock options and restricted stock (in shares)	0.9	1.6	0.9	2.0
Weighted average shares outstanding-diluted	168.7	169.6	169.1	169.5
Net income per common share attributable to Bruker Corporation shareholders:
Basic and diluted (in dollars per share)	$ 0.07	$ 0.03	$ 0.24	$ 0.18