2.2.0.7 false Shareholder's Equity 0210 - Disclosure - Shareholder's Equity true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 0 us-gaap_StockholdersEquityNoteAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 1 us-gaap_StockholdersEquityNoteDisclosureTextBlock us-gaap true na duration No definition available. 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 10 - us-gaap:StockholdersEquityNoteDisclosureTextBlock--> <div style="margin-left: 0%"> <div style="margin-top: 12pt; font-size: 1pt">&#160; </div> <table width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent; text-align: left"><!-- TABLE 05 --> <tr> <td width="5%"></td> <td width="95%"></td> </tr> <tr valign="top"> <td> <b><font style="font-family: 'Times New Roman', Times">10.&#160;&#160;</font></b> </td> <td> <b><font style="font-family: 'Times New Roman', Times">Shareholders&#8217; Equity</font></b> </td> </tr> </table> <div style="margin-top: 6pt; font-size: 1pt">&#160; </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> Shareholders&#8217; equity as of September&#160;30, 2010, decreased $1,191.7&#160;million compared to December&#160;31, 2009. </div> <div style="margin-top: 6pt; font-size: 1pt">&#160; </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> For the nine months ended September&#160;30, 2010, we repurchased approximately 40.3&#160;million shares at a cost of approximately $2.1&#160;billion under our 2010 and 2009 stock repurchase authorizations. We retired all of these shares as they were acquired. In connection with this retirement, in accordance with our policy, we recorded a reduction in additional <font style="white-space: nowrap">paid-in-capital</font> by the same amount. Our 2010 and 2009 stock repurchase programs were completed during the third and first quarters of 2010, respectively. </div> <div style="margin-top: 6pt; font-size: 1pt">&#160; </div> <div align="left" style="margin-left: 0%; margin-right: 0%; text-indent: 4%; font-size: 10pt; font-family: 'Times New Roman', Times; color: #000000; background: transparent"> This decline in shareholders&#8217; equity was offset by net income attributable to Biogen Idec Inc. of $765.0&#160;million, and the increase to additional paid-in capital resulting from the amortization of expense associated with our share-based compensation programs of $137.1&#160;million. </div> <!-- XBRL Pagebreak Begin --> </div> <!-- END PAGE WIDTH --> <!-- PAGEBREAK --> <div style="margin-left: 0%"> <!-- BEGIN PAGE WIDTH --> <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <font style="font-family: 'Times New Roman', Times"> </font> </b> </div> <div style="margin-top: 0pt; font-size: 1pt"> </div> <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <font style="font-family: 'Times New Roman', Times"> </font> </b> </div> <div align="center" style="margin-left: 0%; margin-right: 0%; font-size: 10pt; font-family: Arial, Helvetica; color: #000000; background: transparent"> <b> <i> <font style="font-family: 'Times New Roman', Times"> </font> </i> </b> </div> <div style="margin-top: 0pt; font-size: 1pt"> </div> <!-- XBRL Pagebreak End --> </div> <!--DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" --> <!-- Begin Block Tagged Note false false false us-types:textBlockItemType textblock Disclosures related to accounts comprising shareholders' equity, including other comprehensive income. Includes: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables; effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. 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