Income Taxes (Notes)	9 Months Ended
Income Taxes (Notes)	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to U.S. federal, state, and foreign income taxes. The Company recorded an income tax provision in its Statement of Operations of $96.4 million and $84.4 million for the three months ended September 30, 2014 and 2013, respectively, and $316.6 million and $187.7 million for the nine months ended September 30, 2014 and 2013, respectively. The Company's effective tax rate was 54.7% and 37.4% for the three months ended September 30, 2014 and 2013, respectively, and 57.1% and 36.4% for the nine months ended September 30, 2014 and 2013, respectively. The Company's effective tax rate for the three and nine months ended September 30, 2014 was negatively impacted by losses incurred in foreign jurisdictions with rates lower than the federal statutory rate, the incremental charge related to the non-tax deductible Branded Prescription Drug Fee (see Note 2), and expiration at the end of 2013 of the federal tax credit for increased research activities. In addition, the Company's effective tax rate for the nine months ended September 30, 2014 was negatively impacted by New York State tax legislation enacted in the first quarter of 2014. This tax legislation reduced the New York State income tax rate to zero percent for "qualified manufacturers", including Regeneron, effective in 2014; however, it also resulted in the Company reducing its related deferred tax assets as a discrete item in the first quarter of 2014. As a result, this tax legislation caused a net increase in the Company's effective tax rate of 2.2% for the nine months ended September 30, 2014. The Company's effective tax rate for the nine months ended September 30, 2013 included, as a discrete item in the first quarter of 2013, the favorable impact of the enactment of The American Taxpayer Relief Act in January 2013. The American Taxpayer Relief Act included a provision to extend the income tax credit for increased research activities retroactively to the tax year ended December 31, 2012, as well as for 2013. As a result, the Company's 2012 research tax credit reduced its effective tax rate for the nine months ended September 30, 2013 by 4.3%. The Company also recorded an income tax provision in its Statement of Comprehensive Income of $13.5 million and $14.9 million for the three and nine months ended September 30, 2014, respectively, in connection with the Company’s unrealized gains on “available-for-sale” marketable securities. For both the three and nine months ended September 30, 2013, no such income tax provision or benefit was required in connection with the Company’s unrealized gains (losses) on “available-for-sale” marketable securities. Tax years subsequent to 2010 remain open to examination by federal tax authorities. The Company's 2011 federal income tax return is currently under audit by the IRS. During the second quarter of 2014, New York State tax authorities finalized their audit of the Company's 2009, 2010, and 2011 business corporation franchise tax returns with no adjustments.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details