Earnings Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share
Redemption value adjustment of the redeemable noncontrolling interest	$ 0.0	$ 0.0
Net income attributable to Bruker Corporation, as reported -basic	$ 10.5	$ 30.8
Weighted average shares outstanding:
Weighted average shares outstanding-basic	154.2	156.7
Effect of dilutive securities:
Stock options and restricted stock awards and units (in shares)	1.2	1.2
Weighted average shares outstanding-diluted	155.4	157.9
Net income per common share attributable to Bruker Corporation shareholders:
Basic (in dollars per share)	$ 0.07	$ 0.20
Diluted (in dollars per share)	$ 0.07	$ 0.20

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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