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Collaborative and Other Relationships (Details 2) (AbbVie, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
AbbVie
      
Collaborative arrangements and non-collaborative arrangement transactions      
Total expense incurred by collaboration $ 117.8biib_ExpenseIncurredByCollaboration
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember		 $ 133.4biib_ExpenseIncurredByCollaboration
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember		 $ 128.0biib_ExpenseIncurredByCollaboration
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember
Biogen Idec's share of expense reflected within our consolidation statements of income $ 67.4biib_ExpenseReflectedWithinStatementsOfIncome
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember		 $ 71.0biib_ExpenseReflectedWithinStatementsOfIncome
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember		 $ 65.6biib_ExpenseReflectedWithinStatementsOfIncome
/ us-gaap_TypeOfArrangementAxis
= biib_AbbvieMember