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Commitments and Contingencies (Details Textual) | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |
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Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Apr. 02, 2013 TYSABRI product USD ($) | Dec. 31, 2010 Biogen Idec Hemophilia USD ($) | Dec. 31, 2013 Biogen Idec Hemophilia USD ($) | Jan. 31, 2007 Biogen Idec Hemophilia USD ($) | Dec. 31, 2006 Fumapharm AG USD ($) | Dec. 31, 2013 Cambridge Leases USD ($) | Dec. 31, 2013 Samsung Biosimilar Agreement USD ($) | Dec. 31, 2013 Samsung Biosimilar Agreement KRW | Dec. 31, 2012 Samsung Biosimilar Agreement USD ($) | Dec. 31, 2012 Samsung Biosimilar Agreement KRW | Feb. 29, 2012 Samsung Biosimilar Agreement USD ($) | Feb. 29, 2012 Samsung Biosimilar Agreement KRW | Dec. 31, 2013 TECFIDERA USD ($) | Dec. 31, 2013 TECFIDERA Fumapharm AG USD ($) | Dec. 31, 2013 One billion Fumapharm AG USD ($)
Business Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of lease |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Future minimum rental commitments | $ 677,100,000 | [1] |  |  |  |  |  |  |  | $ 340,000,000 |  |  |  |  |  |  |  |  |
Charges recognized to vacate building |  |  |  |  |  |  |  |  |  | 27,200,000 |  |  |  |  |  |  |  |  |
Maximum contingent consideration in the form of development and approval milestones |  |  |  |  |  |  |  | 80,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |
Milestone payments made during period |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional contingent payment for Biologic License |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional contingent payment for marketing authorization |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Amount paid in cash |  |  |  |  |  |  |  |  | 220,000,000 |  |  |  |  |  |  |  |  |  |
Increase to goodwill | 35,700,000 |  | 48,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 | 25,000,000 |
Cumulative sales level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000
Commitments And Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease rent expense which terminates at various dates through 2028 | 56,100,000 |  | 49,000,000 | 46,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities associated with uncertain tax positions | 99,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  |  |  |  |  |  |  |  | 12,400,000 | 13,500,000,000 |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  | 23,900,000 | 25,200,000,000 | 27,800,000 | 29,700,000,000 | 45,000,000 | 49,500,000,000 |  |  |
Percentage of equity interest to the portion of total capital stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% | 15.00% |  |  |
Funding commitments, Approximately | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses | 28,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellable future commitments | 424,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Potential future milestone payments commitment, approximately | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future contingent payment for the first 12 months |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future contingent payment for annual worldwide net sales up to $2.0 billion |  |  |  |  | 18.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future contingent payment threshold |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future contingent payment for annual worldwide net sales that exceed $2.0 billion |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes future minimum rental commitments related to leases executed for two office buildings in Cambridge, Massachusetts, which completed construction in July and November 2013. The leases both have 15 year terms and we have options to extend the term of each lease for two additional five-year terms. Future minimum rental commitments under these leases will total approximately $340.0 million over the initial 15 year lease terms.As a result of our decision to relocate our corporate headquarters to Cambridge, Massachusetts, we vacated part of our Weston, Massachusetts facility in the fourth quarter of 2013. We incurred a charge of $27.2 million in connection with this move. This charge represents our remaining lease obligation for the vacated portion of our Weston facility, net of sublease income expected to be received. The term of our sublease to the vacated portion of our Weston facility started in January 2014 and will continue through the remaining term of our lease agreement. For additional information related to these transactions, please read Note 11, Property, Plant and Equipment to these consolidated financial statements.

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