Restructuring Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	36 Months Ended
	Mar. 31, 2012	Mar. 31, 2012
Restructuring Cost and Reserve [Line Items]
Termination and site closure costs	$ 1.1
Cost incurred to date		4.9
UK Locations [Member]
Restructuring Cost and Reserve [Line Items]
Estimated expenses related to consolidation	4.7
GTI Diagnostics and U.S. Tepnel [Member]
Restructuring Cost and Reserve [Line Items]
Estimated expenses related to consolidation	$ 0.5