Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share
Net income attributable to Bruker Corporation, as reported	$ 39.7	$ 19.8	$ 64.7	$ 53.2
Weighted average shares outstanding:
Weighted average shares outstanding-basic	166.0	165.6	165.9	165.4
Effect of dilutive securities:
Stock options and restricted stock (in shares)	1.3	1.3	1.4	1.6
Weighted average shares outstanding-diluted	167.3	166.9	167.3	167.0
Net income per common share attributable to Bruker Corporation shareholders:
Basic and Diluted (in dollars per share)	$ 0.24	$ 0.12	$ 0.39	$ 0.32
Stock options.
Anti-dilutive securities
Number of shares excluded from the computation of diluted earnings per share	1.7	0.2	0.7	0.2

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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