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Acquisitions Acquisitions (Details) (USD $)
9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
TYSABRI product [Member]
Apr. 02, 2013
TYSABRI product [Member]
Business Acquisition [Line Items]          
Acquisition of TYSABRI rights $ 3,262,719,000 $ 0   $ 3,250,000,000  
Deferred revenue 240,700,000   148,000,000   84,400,000
Net intangible asset         3,178,300,000
Estimated life, (in years)       17 years  
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%