Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share
Net income attributable to Bruker Corporation, as reported -basic	$ 46.5	$ 11.8	$ 84.6	$ 40.2
Net income attributable to Bruker Corporation, as reported -diluted	$ 46.5	$ 11.8	$ 84.6	$ 40.2
Weighted average shares outstanding:
Weighted average shares outstanding-basic	160.8	167.8	161.8	168.2
Effect of dilutive securities:
Stock options and restricted stock units (in shares)	0.7	0.9	0.9	0.9
Weighted average shares outstanding-diluted	161.5	168.7	162.7	169.1
Net income per common share attributable to Bruker Corporation shareholders:
Basic and diluted (in dollars per share)	$ 0.29	$ 0.07	$ 0.52	$ 0.24