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Intangible Assets and Goodwill (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Out-licensed patents | Dec. 31, 2012 Out-licensed patents | Dec. 31, 2013 Out-licensed patents Maximum | Dec. 31, 2013 Out-licensed patents Minimum | Dec. 31, 2013 AVONEX developed technology | Dec. 31, 2012 AVONEX developed technology | Dec. 31, 2013 AVONEX developed technology Maximum | Dec. 31, 2013 AVONEX developed technology Minimum | Dec. 31, 2013 Acquired and in-licensed rights and patents | Dec. 31, 2012 Acquired and in-licensed rights and patents | Dec. 31, 2013 Acquired and in-licensed rights and patents Maximum | Dec. 31, 2013 Acquired and in-licensed rights and patents Minimum | Dec. 31, 2013 In-process research and development | Dec. 31, 2012 In-process research and development | Dec. 31, 2013 Trademarks and trade names | Dec. 31, 2012 Trademarks and trade names | Dec. 31, 2013 AVONEX AVONEX developed technology | Mar. 08, 2012 Stromedix | Dec. 31, 2013 TYSABRI product | Apr. 02, 2013 TYSABRI product
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated life, (In Years) |  |  |  |  |  | 23 years | 13 years |  |  | 23 years | 15 years |  |  | 17 years | 6 years |  |  |  |  |  |  | 17 years |
Indefinite lived intangible assets useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Indefinite |  | Indefinite |  |  |  |  |
Cost |  |  |  | $ 578,000,000 | $ 578,000,000 |  |  | $ 3,005,300,000 | $ 3,005,300,000 |  |  | $ 3,240,000,000 | $ 53,700,000 |  |  |  |  |  |  |  |  |  |
Cost and net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 327,400,000 | 330,100,000 | 64,000,000 | 64,000,000 |  |  |  |
Total intangible assets, gross | 7,214,700,000 | 4,031,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | (2,740,000,000) | (2,399,600,000) |  | (450,800,000) | (421,000,000) |  |  | (2,165,400,000) | (1,965,700,000) |  |  | (123,800,000) | (12,900,000) |  |  | 0 | 0 | 0 | 0 |  |  |  |
Net |  |  |  | 127,200,000 | 157,000,000 |  |  | 839,900,000 | 1,039,600,000 |  |  | 3,116,200,000 | 40,800,000 |  |  |  |  |  |  | 829,700,000 |  |  |
Intangible assets, net | 4,474,653,000 | 1,631,547,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets and Goodwill (Additional Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2014 | 426,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2015 | 336,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2016 | 322,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2017 | 327,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2018 | 330,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FiniteLivedIntangibleAssetsFutureAmortization | 1,743,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets | 342,948,000 | 202,204,000 | 208,566,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |  |  |  |  |
Total purchase price allocated to IPR&D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,200,000 |  |
Net intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,178,300,000

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