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Employee Savings Plans | 12 Months Ended
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Dec. 31, 2022
Retirement Benefits [Abstract] |
Employee Savings Plans | 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, as defined, to the accounts of participants under the Savings Plan. The Company also maintains additional employee savings plans outside of the United States, which cover eligible employees. Expenses recognized by the Company related to contributions to such plans were $67.6 million, $55.5 million, and $49.9 million for the years ended December 31, 2022, 2021, and 2020, respectively.

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