Shareholders' Equity - Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of comprehensive income (loss)
Consolidated net income	$ 88.1	$ 55.3	$ 204.6	$ 90.1
Foreign currency translation adjustments	(26.6)	38.9	(80.2)	42.8
Derivatives designated as hedging instruments, net of tax	10.5	(30.3)	59.3	(37.7)
Pension liability adjustments, net of tax	1.1	0.1	4.4	14.9
Net comprehensive income	73.1	64.0	188.1	110.1
Less: Comprehensive income attributable to noncontrolling interests	0.7	1.4	0.9	1.5
Less: Comprehensive loss attributable to redeemable noncontrolling interest				(0.5)
Comprehensive income attributable to Bruker Corporation	$ 72.4	$ 62.6	$ 187.2	$ 109.1