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Intangible Assets and Goodwill (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 6 Months Ended |  |  | 6 Months Ended |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  | 6 Months Ended |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Out-licensed patents | Jun. 30, 2014 Out-licensed patents | Dec. 31, 2013 Out-licensed patents | Jun. 30, 2014 Out-licensed patents Minimum | Jun. 30, 2014 Out-licensed patents Maximum | Jun. 30, 2014 Developed technology | Dec. 31, 2013 Developed technology | Jun. 30, 2014 Developed technology Minimum | Jun. 30, 2014 Developed technology Maximum | Jun. 30, 2014 Developed technology AVONEX | Jun. 30, 2014 Acquired and in-licensed rights and patents | Dec. 31, 2013 Acquired and in-licensed rights and patents | Jun. 30, 2014 Acquired and in-licensed rights and patents Minimum | Jun. 30, 2014 Acquired and in-licensed rights and patents Maximum | Jun. 30, 2014 In-process research and development | Dec. 31, 2013 In-process research and development | Jun. 30, 2014 Trademarks and trade names | Dec. 31, 2013 Trademarks and trade names | Apr. 02, 2013 TYSABRI product | Jun. 30, 2014 TYSABRI product Acquired and in-licensed rights and patents | Jun. 30, 2014 ALPROLIX product | Jun. 30, 2014 ALPROLIX product Acquired and in-licensed rights and patents | Jun. 30, 2014 Fumapharm AG [Member] TECFIDERA [Member] | Jun. 30, 2014 Two billion [Member] Fumapharm AG [Member]
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated life, (in years) |  |  |  |  |  |  |  |  | 13 years | 23 years |  |  | 15 years | 23 years |  |  |  | 6 years | 17 years |  |  |  |  |  |  |  |  |  |
Indefinite lived intangible assets useful life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Indefinite until commercialization |  | Indefinite |  |  |  |  |  |  |
Cost |  |  |  |  |  |  | $ 543,300,000 | $ 578,000,000 |  |  | $ 3,005,300,000 | $ 3,005,300,000 |  |  |  | $ 3,271,500,000 | $ 3,240,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Cost and Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 330,900,000 | 327,400,000 | 64,000,000 | 64,000,000 |  |  |  |  |  |
Total intangible assets, gross | 7,215,000,000 |  | 7,215,000,000 |  | 7,214,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | (2,965,600,000) |  | (2,965,600,000) |  | (2,740,000,000) |  | (465,900,000) | (450,800,000) |  |  | (2,283,700,000) | (2,165,400,000) |  |  |  | (216,000,000) | (123,800,000) |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |
Net |  |  |  |  |  |  | 77,400,000 | 127,200,000 |  |  | 721,600,000 | 839,900,000 |  |  | 711,900,000 | 3,055,500,000 | 3,116,200,000 |  |  |  |  |  |  |  | 2,995,100,000 |  |  |  |
Intangible assets, net | 4,249,378,000 |  | 4,249,378,000 |  | 4,474,653,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset impairment charges |  |  |  |  |  | 34,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net intangible asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,178,300,000 |  |  |  |  |
Contingent payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |
Increase in in-licensed rights and patents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,800,000 |  |
Income tax benefit (expense) | 268,521,000 | 159,140,000 | 446,935,000 | 224,648,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,100,000 |
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets | 116,826,000 | 82,225,000 | 260,084,000 | 133,526,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to goodwill |  |  | 131,900,000 |  | 35,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |
Cumulative sales level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000
Accumulated impairment losses related to goodwill | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets And Goodwill (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2014 (remaining six months) | 217,200,000 |  | 217,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2015 | 333,400,000 |  | 333,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2016 | 318,800,000 |  | 318,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2017 | 322,000,000 |  | 322,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2018 | 323,100,000 |  | 323,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2019 | 302,900,000 |  | 302,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 1,817,400,000 |  | $ 1,817,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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