Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accumulated Other Comprehensive Income
Consolidated net income	$ 15.1	$ 11.7
Foreign currency translation adjustments	18.8	28.1
Unrealized losses on interest rate swap:
Unrealized holding losses arising during the period	(0.2)	(0.1)
Less reclassification adjustments for settlements included in the determination of net income	0.5	0.5
Pension liability adjustments	(0.6)	(0.4)
Net comprehensive income	33.6	39.8
Less: Comprehensive income attributable to noncontrolling interests	0.1	0.5
Comprehensive income attributable to Bruker Corporation	$ 33.5	$ 39.3