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Retirement Plans | 12 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
Retirement Plans | Retirement Plans The Company has seven defined contribution retirement plans covering substantially all salaried employees and nonunion hourly employees. The Simpson Manufacturing Co., Inc. 401(k) Profit Sharing Plan (the "Plan") covers U.S. employees and provides for quarterly safe harbor contributions, limited to 3.0% of the employees' quarterly eligible compensation and for annual discretionary contributions, subject to certain limitations. The discretionary amounts for 2024, 2023 and 2022 were equal to 7.0% of qualifying salaries or wages of the covered employees. The Company also has the Simpson Manufacturing Co., Inc. SMW Supplemental 401(k) Plan where it makes periodic contributions to this plan in accordance with the collective bargaining agreement. For 2024, the Company contributed 1.0% of the covered employees' qualifying salaries and wages. The other five defined contribution plans, covering the Company’s European and Canadian employees, require the Company to make contributions ranging from 3.0% to 15.0% of the employees’ compensation. The total cost for these retirement plans for the years ended December 31, 2024, 2023 and 2022, was $29.7 million, $26.8 million, and $23.8 million, respectively. We participate in various multiemployer benefit plans that cover some of our employees who are represented by labor unions. We make periodic contributions to these plans in accordance with the terms of applicable collective bargaining agreements and laws but do not sponsor or administer these plans. We do not participate in any multiemployer benefit plans for which we consider our contributions to be individually significant. If we withdraw from participation in any of these plans, the applicable law would require us to fund our allocable share of the unfunded vested benefits, which is known as a withdrawal liability. As of December 31, 2024, we believe that there was no probable withdrawal liability under the multiemployer benefit pension plans under the terms of collective-bargaining agreements that cover its union-represented employees. Our total contribution to various industry-wide, union-sponsored pension funds and a statutorily required pension fund for employees in the U.S. and Europe were $6.1 million, $5.7 million and $5.4 million for the years ended December 31, 2024, 2023 and 2022, respectively.

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