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Intangible Assets and Goodwill (Details) (USD $) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Out-licensed patents | Dec. 31, 2013 Out-licensed patents | Mar. 31, 2014 Out-licensed patents Minimum | Mar. 31, 2014 Out-licensed patents Maximum | Mar. 31, 2014 Developed technology | Dec. 31, 2013 Developed technology | Mar. 31, 2014 Developed technology Minimum | Mar. 31, 2014 Developed technology Maximum | Mar. 31, 2014 Developed technology AVONEX | Mar. 31, 2014 Acquired and in-licensed rights and patents | Dec. 31, 2013 Acquired and in-licensed rights and patents | Mar. 31, 2014 Acquired and in-licensed rights and patents Minimum | Mar. 31, 2014 Acquired and in-licensed rights and patents Maximum | Mar. 31, 2014 In-process research and development | Dec. 31, 2013 In-process research and development | Mar. 31, 2014 Trademarks and trade names | Dec. 31, 2013 Trademarks and trade names | Mar. 31, 2014 TYSABRI product | Apr. 02, 2013 TYSABRI product | Mar. 31, 2014 ALPROLIX product | Mar. 31, 2014 ALPROLIX product Acquired and in-licensed rights and patents
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 |  |  |  | $ 3,269,600,000 | $ 3,240,000,000 |  |  |  |  |  |  |  |  |  |
Cost and Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 330,900,000 | 327,400,000 | 64,000,000 | 64,000,000 |  |  |  |
Total intangible assets, gross | 7,213,100,000 |  | 7,214,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | (2,848,800,000) |  | (2,740,000,000) | (458,300,000) | (450,800,000) |  |  | (2,224,300,000) | (2,165,400,000) |  |  |  | (166,200,000) | (123,800,000) |  |  | 0 | 0 | 0 | 0 |  |  |  |
Net |  |  |  | 85,000,000 | 127,200,000 |  |  | 781,000,000 | 839,900,000 |  |  | 771,100,000 | 3,103,400,000 | 3,116,200,000 |  |  |  |  |  |  | 3,041,000,000 |  |  |
Intangible assets, net | 4,364,384,000 |  | 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
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets | 143,258,000 | 51,301,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated impairment losses related to goodwill | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets And Goodwill (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2014 (remaining nine months) | 316,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2015 | 334,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2016 | 319,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2017 | 323,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2018 | 324,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2019 | 304,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 1,922,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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