Contingencies (Medical Monitoring Class Actions Narrative) (Details) (Medical Monitoring Class Actions [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Loss Contingencies [Line Items]
Purported medical monitoring class action cases pending	2
Donovan [Member]
Loss Contingencies [Line Items]
Proposed 28-year medical monitoring program cost	190