Shareholders' Equity - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary of comprehensive income (loss)
Consolidated net income	$ 57.8	$ 10.6
Foreign currency translation adjustments	(19.5)	(13.0)
Pension liability adjustments, net of tax	3.3	14.5
Net comprehensive income	41.6	12.1
Less: Comprehensive income (loss) attributable to noncontrolling interests	0.9	(0.1)
Less: Comprehensive income (loss) attributable to redeemable noncontrolling interest		(0.5)
Comprehensive income attributable to Bruker Corporation	$ 40.7	$ 12.7