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Employee Benefit Plans - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2017
Employee Benefits Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation of defined benefit pension plans | $ 409,600,000 | $ 445,200,000 |  |
Discount rate | 5.30% | 4.70% |  |
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans | $ 21,000,000 |  |  |
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets | 79.00% |  |  |
Percentage of total membership in pension plan insured |  |  |  | 40.00%
Percentage limitation of an employee's total account balance that may be allocated to the Mattel Stock Fund in the Mattel, Inc. Personal Investment Plan | 25.00% |  |  |
Liability for deferred compensation and excess benefit plans | $ 56,900,000 | $ 53,300,000 |  |
Cash surrender value of life insurance policies | 97,100,000 | 87,100,000 |  |
Expense for incentive compensation plans | $ 150,900,000 | $ 137,800,000 | $ 0 |
Defined benefit pension plans |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Discount rate | 5.30% | 4.70% |  |
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans | 6.20% | 5.00% | 5.00% |
U.S. equity securities |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 42.00% |  |  |
Non U.S. Equity Securities |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 28.00% |  |  |
Long-Term Bond Securities |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 20.00% |  |  |
US Treasury Securities |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Target allocation for domestic defined benefit pension plan assets | 10.00% |  |  |

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