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Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Feb. 12, 2015
Intangible assets
Total intangible assets, gross	$ 7,627,600,000us-gaap_IntangibleAssetsGrossExcludingGoodwill		$ 7,207,100,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
Accumulated Amortization	(3,274,500,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization		(3,178,600,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net	4,353,123,000us-gaap_IntangibleAssetsNetExcludingGoodwill		4,028,507,000us-gaap_IntangibleAssetsNetExcludingGoodwill
Intangible Assets and Goodwill (Textual) [Abstract]
Amortization of acquired intangible assets	95,903,000us-gaap_AmortizationOfIntangibleAssets	143,258,000us-gaap_AmortizationOfIntangibleAssets
Accumulated impairment losses related to goodwill	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Intangible Assets And Goodwill (Additional Textual) [Abstract]
Expected future amortization expense, 2015 (remaining nine months)	269,000,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Expected future amortization expense, 2016	313,300,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Expected future amortization expense, 2017	286,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Expected future amortization expense, 2018	281,600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Expected future amortization expense, 2019	270,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Expected future amortization expense, 2020	263,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total	1,683,800,000biib_Finitelivedintangibleassetsfutureamortization
Out-licensed patents
Intangible assets
Cost	543,300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember		543,300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember
Accumulated Amortization	(487,800,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember		(481,700,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember
Net	55,500,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember		61,600,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember
Impairment of out-licensed patent		34,700,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_OutLicensedPatentsMember
Out-licensed patents | Minimum
Intangible assets
Estimated life, (in years)	13 years
Out-licensed patents | Maximum
Intangible assets
Estimated life, (in years)	23 years
Developed technology
Intangible assets
Cost	3,005,300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember		3,005,300,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Accumulated Amortization	(2,447,500,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember		(2,396,800,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Net	557,800,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember		608,500,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember
Developed technology | Minimum
Intangible assets
Estimated life, (in years)	15 years
Developed technology | Maximum
Intangible assets
Estimated life, (in years)	23 years
Developed technology | AVONEX
Intangible assets
Net	548,700,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember / us-gaap_ProductOrServiceAxis = biib_AVONEXMember
Acquired and in-licensed rights and patents
Intangible assets
Cost	3,288,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember		3,280,400,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember
Accumulated Amortization	(339,200,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember		(300,100,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember
Net	2,949,700,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember		2,980,300,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember
Acquired and in-licensed rights and patents | Minimum
Intangible assets
Estimated life, (in years)	6 years
Acquired and in-licensed rights and patents | Maximum
Intangible assets
Estimated life, (in years)	17 years
In-process research and development
Intangible assets
Indefinite lived intangible assets useful life	Indefinite until commercialization
Cost and Net	726,100,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember		314,100,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Accumulated Amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember		0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember
Trademarks and trade names
Intangible assets
Indefinite lived intangible assets useful life	Indefinite
Cost and Net	64,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember		64,000,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Accumulated Amortization	0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember		0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember
Convergence Pharmaceuticals
Intangible assets
In-process research and development and other intangible assets				424,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = biib_ConvergencePharmaceuticalsMember
TYSABRI product | Acquired and in-licensed rights and patents
Intangible assets
Net	$ 2,886,600,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = biib_TysabriProductMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = biib_InLicensedPatentsMember

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