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Stock-Based Compensation - Unrecognized Compensation Expense (Details) - Bruker Corporation Stock Plan
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Stock options  
Stock-Based Compensation  
Expected pre-tax stock-based compensation expense $ 15.6
Weighted average remaining service period 2 years 6 months 22 days
Restricted stock  
Stock-Based Compensation  
Expected pre-tax stock-based compensation expense $ 3.6
Weighted average remaining service period 2 years 9 months 4 days