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Litigation (Details) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2013 Hoechst USD ($)	Mar. 31, 2013 Hoechst EUR (€)	Dec. 31, 2013 Hoechst USD ($)	Dec. 31, 2008 Canada Lease Dispute USD ($)	Dec. 31, 2011 ITALY EUR (€)	Sep. 30, 2013 ITALY EUR (€)	Jun. 30, 2011 Genentech RITUXAN Hoechst USD ($)
Loss Contingencies [Line Items]
Compensatory damages		€ 108.0		$ 2.6
Prejudgment interest		54
Decrease In Share Of Co Promotion Profits Due To Estimated Compensation Damages	41.5		49.7				50.0
Payment in case of any unfavorable determination received					30.7
Limited period for government reimbursement					24 months
Automatic renewal period for the resolution					24 months
Reimbursement limit stated in the resolution					24 months
Loss contingency, expected settlement						€ 33.3