XML 105 R66.htm IDEA: XBRL DOCUMENT v2.4.1.9
Equity (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of equity attributable to non-controlling interests    
NCI, beginning of period $ 5,030,000us-gaap_MinorityInterest $ 600,000us-gaap_MinorityInterest
Net income (loss) attributable to NCI, net of tax (2,367,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (228,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Fair value of net assets and liabilities acquired and assigned to NCI 0us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination 4,000,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
Translation adjustment and other 100,000biib_Noncontrollinginterestincreasedecreaseother 0biib_Noncontrollinginterestincreasedecreaseother
NCI, end of period $ 2,687,000us-gaap_MinorityInterest $ 4,400,000us-gaap_MinorityInterest