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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Savings Plan	Employee Savings Plan In 1993, the Company adopted the provisions of the Regeneron Pharmaceuticals, Inc. 401(k) Savings Plan (the "Savings Plan"). The terms of the Savings Plan provide for U.S. employees who have met defined service requirements to participate in the Savings Plan by electing to contribute to the Savings Plan a percentage of their compensation to be set aside to pay their future retirement benefits, as defined. The Savings Plan, as amended and restated, provides for the Company to make discretionary contributions ("Contribution"), as defined. The Company recognized $13.1 million, $5.7 million, and $6.3 million of Contribution expense in 2014, 2013, and 2012, respectively.