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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2025
Retirement Benefits [Abstract] |
Schedule of Retirement Plan Expense | A summary of retirement plan expense, net is as follows:
| For the Year Ended
| December 31, 2025 |  | December 31, 2024 |  | December 31, 2023
| (In thousands)
Defined contribution retirement plans | $ | 42,953 |  |  | $ | 40,227 |  |  | $ | 37,784 |
Defined benefit pension plans | 15,042 |  |  | 12,806 |  |  | 9,949 |
Deferred compensation and excess benefit plans | 5,463 |  |  | (1,537) |  |  | 8,227 |
Postretirement benefit plans | (2,144) |  |  | (2,046) |  |  | (2,084) |
| $ | 61,314 |  |  | $ | 49,450 |  |  | $ | 53,876 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive (Loss) Income | A summary of the components of Mattel's net periodic benefit cost/credit and other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) for the years ended December 31 is as follows:
| Defined Benefit Pension Plans |  | Postretirement Benefit Plans
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
| (In thousands)
Net Periodic Benefit Cost (Credit): |  |  |  |  |  |  |  |  |
Service cost | $ | 3,400 |  |  | $ | 3,388 |  |  | $ | 3,371 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 20,523 |  |  | 20,181 |  |  | 20,966 |  |  | 144 |  |  | 180 |  |  | 179 |
Expected return on plan assets | (17,575) |  |  | (18,738) |  |  | (20,372) |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 200 |  |  | 194 |  |  | 150 |  |  | (1,997) |  |  | (2,038) |  |  | (2,038) |
Recognized actuarial loss (gain) | 8,683 |  |  | 7,781 |  |  | 5,893 |  |  | (292) |  |  | (190) |  |  | (226) |
Settlement (gain) | (68) |  |  | — |  |  | (59) |  |  | — |  |  | — |  |  | — |
Curtailment (gain) | (121) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | 15,042 |  |  | $ | 12,806 |  |  | $ | 9,949 |  |  | $ | (2,144) |  |  | $ | (2,046) |  |  | $ | (2,084) |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss | $ | (19,309) |  |  | $ | (5,086) |  |  | $ | 904 |  |  | $ | 32 |  |  | $ | (433) |  |  | $ | 311 |
Prior service cost | — |  |  | 131 |  |  | 1,169 |  |  | — |  |  | — |  |  | — |
Amortization of prior service (cost) credit | (200) |  |  | (194) |  |  | (150) |  |  | 1,997 |  |  | 2,038 |  |  | 2,038 |
Total recognized in other comprehensive (income) loss (a) | $ | (19,509) |  |  | $ | (5,149) |  |  | $ | 1,923 |  |  | $ | 2,029 |  |  | $ | 1,605 |  |  | $ | 2,349 |
Total recognized in net periodic benefit cost (credit) and other comprehensive income (loss) | $ | (4,467) |  |  | $ | 7,657 |  |  | $ | 11,872 |  |  | $ | (115) |  |  | $ | (441) |  |  | $ | 265 |
(a)Amounts exclude related tax expense (benefit) of approximately $5 million, $1 million, and $(2) million, during 2025, 2024, and 2023, respectively, which are also included in other comprehensive income (loss).
Schedule of Components of Net Periodic Benefit Cost (Credit) | A summary of the components of Mattel's net periodic benefit cost/credit and other changes in plan assets and benefit obligations recognized in other comprehensive income (loss) for the years ended December 31 is as follows:
| Defined Benefit Pension Plans |  | Postretirement Benefit Plans
| 2025 |  | 2024 |  | 2023 |  | 2025 |  | 2024 |  | 2023
| (In thousands)
Net Periodic Benefit Cost (Credit): |  |  |  |  |  |  |  |  |
Service cost | $ | 3,400 |  |  | $ | 3,388 |  |  | $ | 3,371 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 20,523 |  |  | 20,181 |  |  | 20,966 |  |  | 144 |  |  | 180 |  |  | 179 |
Expected return on plan assets | (17,575) |  |  | (18,738) |  |  | (20,372) |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) | 200 |  |  | 194 |  |  | 150 |  |  | (1,997) |  |  | (2,038) |  |  | (2,038) |
Recognized actuarial loss (gain) | 8,683 |  |  | 7,781 |  |  | 5,893 |  |  | (292) |  |  | (190) |  |  | (226) |
Settlement (gain) | (68) |  |  | — |  |  | (59) |  |  | — |  |  | — |  |  | — |
Curtailment (gain) | (121) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost (credit) | $ | 15,042 |  |  | $ | 12,806 |  |  | $ | 9,949 |  |  | $ | (2,144) |  |  | $ | (2,046) |  |  | $ | (2,084) |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss): |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss | $ | (19,309) |  |  | $ | (5,086) |  |  | $ | 904 |  |  | $ | 32 |  |  | $ | (433) |  |  | $ | 311 |
Prior service cost | — |  |  | 131 |  |  | 1,169 |  |  | — |  |  | — |  |  | — |
Amortization of prior service (cost) credit | (200) |  |  | (194) |  |  | (150) |  |  | 1,997 |  |  | 2,038 |  |  | 2,038 |
Total recognized in other comprehensive (income) loss (a) | $ | (19,509) |  |  | $ | (5,149) |  |  | $ | 1,923 |  |  | $ | 2,029 |  |  | $ | 1,605 |  |  | $ | 2,349 |
Total recognized in net periodic benefit cost (credit) and other comprehensive income (loss) | $ | (4,467) |  |  | $ | 7,657 |  |  | $ | 11,872 |  |  | $ | (115) |  |  | $ | (441) |  |  | $ | 265 |
(a)Amounts exclude related tax expense (benefit) of approximately $5 million, $1 million, and $(2) million, during 2025, 2024, and 2023, respectively, which are also included in other comprehensive income (loss).
Schedule of Assumptions Used to Calculate Net Periodic Benefit Cost for Domestic Defined Benefit Pension and Postretirement Benefit Plans | Net periodic benefit cost/credit for Mattel's domestic defined benefit pension and postretirement benefit plans was calculated on January 1 of each year using the following assumptions:
| For the Year Ended
| December 31, 2025 |  | December 31, 2024 |  | December 31, 2023
Defined benefit pension plans: |  |  |  |  |
Discount rate | 5.3 | % |  | 4.7 | % |  | 4.9 | %
Weighted-average rate of future compensation increases | N/A |  | N/A |  | N/A
Long-term rate of return on plan assets | 6.2 | % |  | 6.2 | % |  | 5.0 | %
Postretirement benefit plans: |  |  |  |  |
Discount rate | 5.3 | % |  | 4.7 | % |  | 4.9 | %
Annual increase in Medicare Part B premium | 6.0 | % |  | 6.0 | % |  | 6.0 | %
Health care cost trend rate: |  |  |  |  |
Pre-65 | 7.6 | % |  | 7.9 | % |  | 7.0 | %
Post-65 | 7.8 | % |  | 8.1 | % |  | 7.0 | %
Ultimate cost trend rate: |  |  |  |  |
Pre-65 | 4.5 | % |  | 4.5 | % |  | 4.5 | %
Post-65 | 4.5 | % |  | 4.5 | % |  | 4.5 | %
Year that the rate reaches the ultimate cost trend rate: |  |  |  |  |
Pre-65 | 2031 |  | 2031 |  | 2029
Post-65 | 2031 |  | 2031 |  | 2029
Schedule of Changes in Benefit Obligation and Plan Assets for Defined Benefit Pension and Postretirement Benefit Plans | A summary of the changes in benefit obligation and plan assets is as follows:
| Defined Benefit Pension Plans |  | Postretirement Benefit Plans
| December 31, 2025 |  | December 31, 2024 |  | December 31, 2025 |  | December 31, 2024
| (In thousands)
Change in Benefit Obligation: |  |  |  |  |  |  |
Benefit obligation, beginning of year | $ | 423,877 |  |  | $ | 460,676 |  |  | $ | 3,082 |  |  | $ | 4,085 |
Service cost | 3,400 |  |  | 3,388 |  |  | 1 |  |  | 2 |
Interest cost | 20,523 |  |  | 20,181 |  |  | 144 |  |  | 180 |
Impact of currency exchange rate changes | 8,259 |  |  | (5,085) |  |  | — |  |  | — |
Actuarial loss (gain) | 2,857 |  |  | (20,525) |  |  | (260) |  |  | (623) |
Benefits paid | (34,644) |  |  | (34,294) |  |  | (475) |  |  | (562) |
Plan amendments | — |  |  | 61 |  |  | — |  |  | — |
Curtailments | (177) |  |  | (372) |  |  | — |  |  | — |
Settlements | (305) |  |  | — |  |  | — |  |  | — |
Other | — |  |  | (153) |  |  | — |  |  | — |
Benefit obligation, end of year | $ | 423,790 |  |  | $ | 423,877 |  |  | $ | 2,492 |  |  | $ | 3,082 |
Change in Plan Assets: |  |  |  |  |  |  |
Plan assets at fair value, beginning of year | $ | 306,279 |  |  | $ | 327,336 |  |  | $ | — |  |  | $ | — |
Actual return (loss) on plan assets | 31,552 |  |  | (3,336) |  |  | — |  |  | — |
Employer contributions | 21,565 |  |  | 17,786 |  |  | 475 |  |  | 562 |
Impact of currency exchange rate changes | 4,812 |  |  | (1,102) |  |  | — |  |  | — |
Benefits paid | (34,644) |  |  | (34,294) |  |  | (475) |  |  | (562) |
Settlements | (305) |  |  | — |  |  | — |  |  | — |
Other | — |  |  | (111) |  |  | — |  |  | — |
Plan assets at fair value, end of year | $ | 329,259 |  |  | $ | 306,279 |  |  | $ | — |  |  | $ | — |
Net Amount Recognized in Consolidated Balance Sheets: |  |  |  |  |  |  |
Funded status, end of year | $ | (94,531) |  |  | $ | (117,598) |  |  | $ | (2,492) |  |  | $ | (3,082) |
Current accrued benefit liabilities | $ | (7,030) |  |  | $ | (6,383) |  |  | $ | (430) |  |  | $ | (530) |
Noncurrent accrued benefit liabilities, net | (87,501) |  |  | (111,215) |  |  | (2,062) |  |  | (2,552) |
Net amount recognized | $ | (94,531) |  |  | $ | (117,598) |  |  | $ | (2,492) |  |  | $ | (3,082) |
Amounts Recognized in Accumulated Other Comprehensive Loss (a): |  |  |  |  |  |  |
Net actuarial loss (gain) | $ | 181,917 |  |  | $ | 208,985 |  |  | $ | (1,967) |  |  | $ | (1,999) |
Prior service cost (credit) | 2,167 |  |  | 2,012 |  |  | — |  |  | (1,997) |
| $ | 184,084 |  |  | $ | 210,997 |  |  | $ | (1,967) |  |  | $ | (3,996) |
(a)Amounts exclude related tax benefits of approximately $56 million and $68 million for December 31, 2025 and 2024, respectively, which are also included in accumulated other comprehensive loss.
Schedule of Accumulated and Projected Benefit Obligations | As of December 31, 2025 and 2024, information for defined benefit pension plans that had aggregate accumulated benefit obligations and projected benefit obligations in excess of plan assets is as follows:
| December 31, 2025 |  | December 31, 2024
| (In thousands)
Projected benefit obligation | $ | 363,669 |  |  | $ | 366,692 |
Accumulated benefit obligation | 348,663 |  |  | 352,415 |
Fair value of plan assets | 261,871 |  |  | 240,863 |
Schedule of Assumptions Used to Determine Projected and Accumulated Benefit Obligations of Domestic Defined Benefit Pension and Postretirement Benefit Plans | The assumptions used in determining the projected and accumulated benefit obligations of Mattel's domestic defined benefit pension and postretirement benefit plans are as follows:
| December 31, 2025 |  | December 31, 2024
Defined benefit pension plans: |  |  |
Discount rate | 5.0 | % |  | 5.3 | %
Cash balance interest crediting rate | 4.0 | % |  | 4.0 | %
Weighted-average rate of future compensation increases | N/A |  | N/A
Postretirement benefit plans: |  |  |
Discount rate | 5.1 | % |  | 5.3 | %
Annual increase in Medicare Part B premium | 6.0 | % |  | 6.0 | %
Health care cost trend rate: |  |  |
Pre-65 | 7.1 | % |  | 7.6 | %
Post-65 | 7.3 | % |  | 7.8 | %
Ultimate cost trend rate: |  |  |
Pre-65 | 4.5 | % |  | 4.5 | %
Post-65 | 4.5 | % |  | 4.5 | %
Year that the rate reaches the ultimate cost trend rate: |  |  |
Pre-65 | 2031 |  | 2031
Post-65 | 2031 |  | 2031
Schedule of Estimated Future Benefit Payments for Defined Benefit Pension and Postretirement Benefit Plans | The estimated future benefit payments for Mattel's defined benefit pension and postretirement benefit plans are as follows:
| Defined Benefit Pension Plans |  | Postretirement Benefit Plans
| (In thousands)
2026 | $ | 37,786 |  |  | $ | 430 |
2027 | 34,026 |  |  | 440 |
2028 | 34,784 |  |  | 320 |
2029 | 34,117 |  |  | 320 |
2030 | 35,709 |  |  | 220 |
2031 - 2035 | 168,248 |  |  | 880 |
Schedule of Plan Assets Measured and Reported in Financial Statements at Fair Value | Mattel's defined benefit pension plan assets are measured and reported in the consolidated financial statements at fair value using inputs, which are more fully described in "Note 11 to the Consolidated Financial Statements—Fair Value Measurements," as follows:
| December 31, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
U.S. government and U.S. government agency securities | $ | — |  |  | $ | 42,459 |  |  | $ | — |  |  | $ | 42,459 |
U.S. corporate debt instruments | — |  |  | 67,035 |  |  | — |  |  | 67,035 |
International corporate debt instruments | — |  |  | 9,897 |  |  | — |  |  | 9,897 |
Mutual funds (a) |  |  |  |  |  |  | 135,853 |
Money market funds | 6,563 |  |  | — |  |  | — |  |  | 6,563 |
Other investments | — |  |  | 6,770 |  |  | — |  |  | 6,770 |
Insurance "buy-in" policy | — |  |  | — |  |  | 55,489 |  |  | 55,489 |
Collective trust funds (a): |  |  |  |  |  |  |
U.S. equity securities |  |  |  |  |  |  | 592 |
International equity securities |  |  |  |  |  |  | 2,822 |
Global fixed income |  |  |  |  |  |  | — |
Real Estate |  |  |  |  |  |  | 1,779 |
Total | $ | 6,563 |  |  | $ | 126,161 |  |  | $ | 55,489 |  |  | $ | 329,259 |
| December 31, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
U.S. government and U.S. government agency securities | $ | — |  |  | $ | 62 |  |  | $ | — |  |  | $ | 62 |
U.S. corporate debt instruments | — |  |  | 60,751 |  |  | — |  |  | 60,751 |
International corporate debt instruments | — |  |  | 4,388 |  |  | — |  |  | 4,388 |
Mutual funds (a) |  |  |  |  |  |  | 126,518 |
Money market funds | 12,365 |  |  | — |  |  | — |  |  | 12,365 |
Other investments | — |  |  | 7,303 |  |  | — |  |  | 7,303 |
Insurance "buy-in" policy | — |  |  | — |  |  | 52,785 |  |  | 52,785 |
Collective trust funds (a): |  |  |  |  |  |  |
U.S. equity securities |  |  |  |  |  |  | 577 |
International equity securities |  |  |  |  |  |  | 2,588 |
Global fixed income |  |  |  |  |  |  | 25,738 |
Real Estate |  |  |  |  |  |  | 13,204 |
Total | $ | 12,365 |  |  | $ | 72,504 |  |  | $ | 52,785 |  |  | $ | 306,279 |
(a) These investments primarily consist of privately placed funds that are valued based on net asset value per share. The fair value of these investments are included in the table above to permit reconciliation of the total defined benefit pension plan assets classified by level within the fair value hierarchy.
Schedule of Assets Measured at Fair Value on a Recurring Basis Using Unobservable Inputs | The following table provides a reconciliation of the beginning and ending balances of insurance buy-in policy contract assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
| Level 3
| (in thousands)
Balance at December 31, 2023 | $ | 60,727 |
Purchases, sales, and settlements | (3,119) |
Changes in fair value | (4,823) |
Balance at December 31, 2024 | 52,785 |
Purchases, sales, and settlements | (3,039) |
Changes in fair value | 5,743 |
Balance at December 31, 2025 | $ | 55,489 |

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