Shareholders' Equity - Comprehensive Income (loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of comprehensive income
Consolidated net income	$ 27.4	$ 21.7
Foreign currency translation adjustments	24.8	15.6
Pension liability adjustments, net of tax	(0.4)	0.2
Net comprehensive income	51.8	37.5
Less: Comprehensive income attributable to noncontrolling interests	0.6	0.2
Comprehensive income attributable to Bruker Corporation	$ 51.2	$ 37.3