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</td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Gross<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Gross<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> &#160; </td> <td> &#160; </td> </tr> <tr style="font-size: 8pt" valign="bottom" align="center"> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Fair<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Unrealized<br /> </b> </td> <td> &#160; </td> <td> &#160; </td> <td colspan="2" nowrap="nowrap" align="center" valign="bottom"> <b>Unrealized<br /> </b> </td> <td> &#160; </td> <td> &#160; 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</td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td nowrap="nowrap" align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 20pt"> Current </div> </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> 0.1 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#8212; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#8212; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> 0.1 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> </tr> <tr valign="bottom"> <td nowrap="nowrap" align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 20pt"> Non-current </div> </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> 55.4 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; 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</td> <td style="border-top: 1px solid #000000"> &#160; </td> <td> &#160; </td> <td> &#160; </td> <td style="border-top: 1px solid #000000"> &#160; </td> <td style="border-top: 1px solid #000000"> &#160; </td> <td> &#160; </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 30pt"> Total <font style="white-space: nowrap">available-for-sale</font> securities </div> </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 757.8 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> 5.3 </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> $ </td> <td nowrap="nowrap" align="right" valign="bottom"> (0.4 </td> <td nowrap="nowrap" align="left" valign="bottom"> ) </td> <td> &#160; 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</td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="right" valign="bottom"> &#160; </td> <td nowrap="nowrap" align="left" valign="bottom"> &#160; </td> </tr> <tr valign="bottom" style="background: #cceeff"> <td align="left" valign="bottom"> <div style="text-indent: -10pt; margin-left: 10pt"> Strategic investments, non-current </div> </td> <td> &#160; 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A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 false 4 1 biib_SummaryOfContractualMaturitiesAvailableForSaleSecuritiesTextBlock biib false na duration This item represents the contractual maturities for available for sale securities. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note Table: biib-20100930_note7_table2 - biib:SummaryOfContractualMaturitiesAvailableForSaleSecuritiesTextBlock--> <div align="left" style="font-size: 10pt; 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