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Intangible Assets and Goodwill (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended |  |  |  | 9 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Out-licensed patents | Dec. 31, 2013 Out-licensed patents | Sep. 30, 2014 Out-licensed patents Minimum | Sep. 30, 2014 Out-licensed patents Maximum | Sep. 30, 2014 Developed technology | Dec. 31, 2013 Developed technology | Sep. 30, 2014 Developed technology Minimum | Sep. 30, 2014 Developed technology Maximum | Sep. 30, 2014 Developed technology AVONEX | Sep. 30, 2014 Acquired and in-licensed rights and patents | Dec. 31, 2013 Acquired and in-licensed rights and patents | Sep. 30, 2014 Acquired and in-licensed rights and patents Minimum | Sep. 30, 2014 Acquired and in-licensed rights and patents Maximum | Sep. 30, 2014 In-process research and development | Sep. 30, 2014 In-process research and development | Dec. 31, 2013 In-process research and development | Sep. 30, 2014 Trademarks and trade names | Dec. 31, 2013 Trademarks and trade names | Apr. 02, 2013 TYSABRI product | Sep. 30, 2014 TYSABRI product Acquired and in-licensed rights and patents | Sep. 30, 2014 ALPROLIX product | Sep. 30, 2014 ALPROLIX product Acquired and in-licensed rights and patents | Sep. 30, 2014 Fumapharm AG TECFIDERA | Sep. 30, 2014 Two billion Fumapharm AG | Jun. 30, 2014 Two billion Fumapharm AG | Sep. 30, 2014 Two billion Fumapharm AG TECFIDERA | Sep. 30, 2014 Three billion Fumapharm AG | Sep. 30, 2014 Three billion Fumapharm AG TECFIDERA
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 |  |  |  | $ 3,274,400,000 | $ 3,240,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost and Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 314,100,000 | 314,100,000 | 327,400,000 | 64,000,000 | 64,000,000 |  |  |  |  |  |  |  |  |  |
Total intangible assets, gross | 7,201,100,000 |  | 7,201,100,000 |  | 7,214,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Amortization | (3,071,300,000) |  | (3,071,300,000) |  | (2,740,000,000) | (473,800,000) | (450,800,000) |  |  | (2,339,800,000) | (2,165,400,000) |  |  |  | (257,700,000) | (123,800,000) |  |  | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |
Net |  |  |  |  |  | 69,500,000 | 127,200,000 |  |  | 665,500,000 | 839,900,000 |  |  | 656,000,000 | 3,016,700,000 | 3,116,200,000 |  |  |  |  |  |  |  |  | 2,957,400,000 |  |  |  |  |  |  |  |
Intangible assets, net | 4,129,754,000 |  | 4,129,754,000 |  | 4,474,653,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of in-process research and development asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total impairment charges |  |  | 50,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of out-licensed patent |  |  |  |  |  | 34,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Changes in fair value | 49,433,000 | 97,000 | 46,213,000 | 2,983,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (49,400,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) | 274,774,000 | 186,105,000 | 721,709,000 | 410,753,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,700,000 |  |  |  |  |
Intangible Assets and Goodwill (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of acquired intangible assets | 122,431,000 | 99,998,000 | 382,515,000 | 233,524,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to goodwill |  |  | 308,300,000 |  | 35,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  | 150,000,000 |  | 200,000,000
Cumulative sales level |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 | 2,000,000,000 |  | 3,000,000,000 |
Accumulated impairment losses related to goodwill | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible Assets And Goodwill (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2014 (remaining three months) | 104,200,000 |  | 104,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2015 | 345,200,000 |  | 345,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2016 | 309,500,000 |  | 309,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2017 | 285,500,000 |  | 285,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2018 | 284,500,000 |  | 284,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected future amortization expense, 2019 | 273,300,000 |  | 273,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 1,602,200,000 |  | $ 1,602,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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