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Employee Savings Plan	12 Months Ended
Employee Savings Plan	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Savings Plan	Employee Savings Plans The Company maintains the Regeneron Pharmaceuticals, Inc. 401(k) Savings Plan, as amended and restated (the "Savings Plan"). The terms of the Savings Plan allow U.S. employees (as defined by the Savings Plan) to contribute to the Savings Plan a percentage of their compensation. In addition, the Company may make discretionary contributions ("Contribution"), as defined, to the accounts of participants under the Savings Plan. The Company recognized $27.0 million, $19.6 million, and $17.7 million of Contribution expense in 2018, 2017, and 2016, respectively. The Company also maintains the Regeneron Ireland Pension Plan (the "Ireland Plan"), a defined contribution occupational pension plan which covers all eligible Ireland-based employees (as defined by the Ireland Plan). Contributions to the Ireland Plan are comprised of two components: (i) a minimum mandatory employee and employer contribution rate, and (ii) a matching feature, whereby the Company will match employee contributions up to a certain percentage. Employees can make additional voluntary contributions to the Ireland Plan. Expenses recognized by the Company related to contributions to the Ireland Plan were not material during 2018, 2017, and 2016.