beatandraise : Equity Research with AI and ChatGPT on SEC Edgar

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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 4 Unrealized gains (losses) on investments 2 biib_UnrealizedGainsLossesOnInvestmentsIncludingPortionAttributableToNoncontrollingInterest biib false credit duration Unrealized appreciation or loss in value (before reclassification adjustment) of the total of investment during the period... false false false false false false false false false false false verboselabel false 1 false true false false 5800000 5800000 false false false 2 false true false false -500000 -500000 false false false 3 false true false false -3600000 -3600000 false false false 4 false true false false 3000000 3000000 false false false xbrli:monetaryItemType monetary Unrealized appreciation or loss in value (before reclassification adjustment) of the total of investment during the period being reported on, net of taxes, including the portion attributable to the noncontrolling interest. No authoritative reference available. false 5 Unrealized gains (losses) on foreign currency forward contract 2 biib_UnrealizedGainsLossesOnForeignCurrencyForwardContractArisingDuringPeriodNetOfTaxIncludingPortionAttributableToNoncontrollingInterest biib false credit duration Unrealized change in accumulated gains and losses on foreign currency forward contracts, during the period reported on, net... false false false false false false false false false false false verboselabel false 1 false true false false -71100000 -71100000 false false false 2 false true false false -2300000 -2300000 false false false 3 false true false false -16800000 -16800000 false false false 4 false true false false 9600000 9600000 false false false xbrli:monetaryItemType monetary Unrealized change in accumulated gains and losses on foreign currency forward contracts, during the period reported on, net of taxes, including the portion attributable to the noncontrolling interest. No authoritative reference available. false 6 (Over) underfunded status of pension and post-retirement benefits plans 2 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 200000 200000 false false false 2 false true false false 200000 200000 false false false 3 false true false false -100000 -100000 false false false 4 false true false false 200000 200000 false false false xbrli:monetaryItemType monetary The accumulated change in the value of either the projected benefit obligation or the plans assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost pursuant to FAS 87 and 106, after tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4 -Subparagraph c, d Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 19, 24 false 7 Translation adjustments 2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 88900000 88900000 false false false 2 false true false false 29700000 29700000 false false false 3 false true false false -40500000 -40500000 false false false 4 false true false false 37300000 37300000 false false false xbrli:monetaryItemType monetary Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 true 8 Comprehensive income (loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 136000000 136000000 false false false 2 false true false false 306700000 306700000 false false false 3 false true false false 565800000 565800000 false false false 4 false true false false 721200000 721200000 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a true 9 Stockholders' Equity attributable to Noncontrolling interest- rollforward 2 us-gaap_MovementInMinorityInterestRollForward us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. false 10 Noncontrolling interest, beginning of period 2 us-gaap_MinorityInterest us-gaap true credit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 40500000 40500000 false false false 2 false true false false 33200000 33200000 false false false 3 false true false false 40352000 40352000 false false false 4 false true false false 27900000 27900000 false false false xbrli:monetaryItemType monetary Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A false 11 Fair Value of assets and liabilities acquired and assigned to noncontrolling interests 2 biib_FairValueOfAssetsAndLiabilitiesAcquiredAndAssignedToNoncontrollingInterestThroughInitialConsolidation biib false credit duration Fair value of assets and liabilities acquired and assigned to noncontrolling interest due to the adoption of a new accounting... false false false false false false false false false false false verboselabel false 1 false true false false 145000000 145000000 false false false 2 false false false false 0 0 false false false 3 false true false false 145000000 145000000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Fair value of assets and liabilities acquired and assigned to noncontrolling interest due to the adoption of a new accounting standard for the consolidation of variable interests. No authoritative reference available. false 12 Net income attributable to noncontrolling interest 2 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -141936000 -141936000 false false false 2 false true false false 1939000 1939000 false false false 3 false true false false -138174000 -138174000 false false false 4 false true false false 6571000 6571000 false false false xbrli:monetaryItemType monetary The portion of net income (loss) attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 false 13 Translation adjustments 2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 4500000 4500000 false false false 2 false true false false 1300000 1300000 false false false 3 false true false false -1300000 -1300000 false false false 4 false true false false 1900000 1900000 false false false xbrli:monetaryItemType monetary Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax, attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29, 30 false 14 Distributions to noncontrolling interest 2 us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -8900000 -8900000 false false false 2 false true false false -2800000 -2800000 false false false 3 false true false false -8900000 -8900000 false false false 4 false true false false -2800000 -2800000 false false false xbrli:monetaryItemType monetary Decrease in noncontrolling interest balance from payment of dividends or other distributions to noncontrolling interest holders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(2) false 15 Capital contributions from noncontrolling interest 2 biib_CapitalContributionsFromNoncontrollingInterest biib false credit duration Capital contributions from noncontrolling interest. false false false false false false false false false false false totallabel false 1 false true false false 300000 300000 false false false 2 false false false false 0 0 false false false 3 false true false false 2500000 2500000 false false false 4 false false false false 0 0 false false false xbrli:monetaryItemType monetary Capital contributions from noncontrolling interest. No authoritative reference available. true 16 Noncontrolling interest, end of period 2 us-gaap_MinorityInterest us-gaap true credit instant No definition available. false false false false false false false false false true false periodendlabel false 1 false true false false 39506000 39506000 false false false 2 false true false false 33600000 33600000 false false false 3 false true false false 39506000 39506000 false false false 4 false true false false 33600000 33600000 false false false xbrli:monetaryItemType monetary Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 27 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 26 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A3 -Appendix A false 17 Comprehensive Income (Textuals) [Abstract] 2 biib_ComprehensiveIncomeTextualsAbstract biib false na duration Comprehensive Income Textuals Abstract. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string Comprehensive Income Textuals Abstract. false 18 Tax on unrealized holding gains (losses) on investments 2 biib_TaxOnUnrealizedHoldingGainsLossesOnInvestments biib false debit duration Tax effect on gross appreciation or the gross loss in value of the total of unsold investments during the period being... false false false false false false false false false false false verboselabel false 1 false true false false 3400000 3400000 false false false 2 false true false false 300000 300000 false false false 3 false true false false 2100000 2100000 false false false 4 false true false false 1700000 1700000 false false false xbrli:monetaryItemType monetary Tax effect on gross appreciation or the gross loss in value of the total of unsold investments during the period being reported on. No authoritative reference available. false 19 Tax on unrealized gains (losses) on foreign currency forward contracts 2 biib_TaxOnUnrealizedGainsOnForeignCurrencyForwardContracts biib false debit duration Tax effect on gross appreciation or the gross loss in value of the total of unsold foreign currency forward contracts during... false false false false false false false false false false false verboselabel false 1 false true false false 8000000 8000000 false false false 2 false true false false 800000 800000 false false false 3 false true false false 1500000 1500000 false false false 4 false true false false 300000 300000 false false false xbrli:monetaryItemType monetary Tax effect on gross appreciation or the gross loss in value of the total of unsold foreign currency forward contracts during the period being reported on. No authoritative reference available. false 20 Parent [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/comprehensiveincomedetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 5 USD true false false false Parent [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD true false false false Parent [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Parent [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD true false false false Parent [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_ParentMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 21 Comprehensive income: 2 us-gaap_ComprehensiveIncomeNoteAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 22 Net income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 254100000 254100000 false false false 2 false true false false 277700000 277700000 false false false 3 false true false false 765000000 765000000 false false false 4 false true false false 664500000 664500000 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 23 Unrealized gains (losses) on investments 2 biib_UnrealizedGainsLossesOnInvestmentsIncludingPortionAttributableToNoncontrollingInterest biib false credit duration Unrealized appreciation or loss in value (before reclassification adjustment) of the total of investment during the period... false false false false false false false false false false false verboselabel false 1 false true false false 5800000 5800000 false false false 2 false true false false -500000 -500000 false false false 3 false true false false -3600000 -3600000 false false false 4 false true false false 3000000 3000000 false false false xbrli:monetaryItemType monetary Unrealized appreciation or loss in value (before reclassification adjustment) of the total of investment during the period being reported on, net of taxes, including the portion attributable to the noncontrolling interest. No authoritative reference available. false 24 Unrealized gains (losses) on foreign currency forward contract 2 biib_UnrealizedGainsLossesOnForeignCurrencyForwardContractArisingDuringPeriodNetOfTaxIncludingPortionAttributableToNoncontrollingInterest biib false credit duration Unrealized change in accumulated gains and losses on foreign currency forward contracts, during the period reported on, net... false false false false false false false false false false false verboselabel false 1 false true false false -71100000 -71100000 false false false 2 false true false false -2300000 -2300000 false false false 3 false true false false -16800000 -16800000 false false false 4 false true false false 9600000 9600000 false false false xbrli:monetaryItemType monetary Unrealized change in accumulated gains and losses on foreign currency forward contracts, during the period reported on, net of taxes, including the portion attributable to the noncontrolling interest. No authoritative reference available. false 25 (Over) underfunded status of pension and post-retirement benefits plans 2 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 200000 200000 false false false 2 false true false false 200000 200000 false false false 3 false true false false -100000 -100000 false false false 4 false true false false 200000 200000 false false false xbrli:monetaryItemType monetary The accumulated change in the value of either the projected benefit obligation or the plans assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost pursuant to FAS 87 and 106, after tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4 -Subparagraph c, d Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 19, 24 false 26 Translation adjustments 2 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 84400000 84400000 false false false 2 false true false false 28400000 28400000 false false false 3 false true false false -39200000 -39200000 false false false 4 false true false false 35400000 35400000 false false false xbrli:monetaryItemType monetary Change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity for the period being reported, net of tax. If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 true 27 Comprehensive income (loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 273400000 273400000 false false false 2 false true false false 303500000 303500000 false false false 3 false true false false 705300000 705300000 false false false 4 false true false false 712700000 712700000 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a true 39 Noncontrolling Interest [Member] 0 na true na na No definition available. false true false false false false false false false false false http://biogenidec.com/role/comprehensiveincomedetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false false 9 USD true false false false Noncontrolling Interest [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_NoncontrollingInterestMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 10 USD true false false false Noncontrolling Interest [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_NoncontrollingInterestMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Noncontrolling Interest [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_NoncontrollingInterestMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 12 USD true false false false Noncontrolling Interest [Member] us-gaap_StatementEquityComponentsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_NoncontrollingInterestMember us-gaap_StatementEquityComponentsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 40 Comprehensive income: 2 us-gaap_ComprehensiveIncomeNoteAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 41 Net income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -141900000 -141900000 false false false 2 false true false false 1900000 1900000 false false false 3 false true false false -138200000 -138200000 false false false 4 false true false false 6600000 6600000 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. 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If an entity's functional currency is a foreign currency, translation adjustments result from the process of translating that entity's financial statements into the reporting currency. Includes gain (loss) on foreign currency forward exchange contracts. Includes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. Includes the gain or loss on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain or loss under FAS 52 and that have been designated and have qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 52 -Paragraph 13, 20, 31 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17 true 46 Comprehensive income (loss) 2 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 true true false false -137400000 -137400000 false false false 2 true true false false 3200000 3200000 false false false 3 true true false false -139500000 -139500000 false false false 4 true true false false 8500000 8500000 false false false xbrli:monetaryItemType monetary The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A5 -Appendix A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a true 4 31 false NoRounding UnKnown UnKnown false true