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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2025
Equity [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications from accumulated other comprehensive income (loss):
| For the Year Ended December 31, 2025
| Derivative Instruments |  | Employee Benefit Plans |  | Currency Translation Adjustments |  | Total
| (In thousands)
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2024 | $ | 14,307 |  |  | $ | (139,663) |  |  | $ | (869,096) |  |  | $ | (994,452) |
Other comprehensive income (loss) before reclassifications | (49,196) |  |  | 8,575 |  |  | 121,458 |  |  | 80,837 |
Amounts reclassified from accumulated other comprehensive income (loss) | 18,173 |  |  | 4,876 |  |  | — |  |  | 23,049 |
Net change in other comprehensive income (loss) | (31,023) |  |  | 13,451 |  |  | 121,458 |  |  | 103,886 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2025 | $ | (16,716) |  |  | $ | (126,212) |  |  | $ | (747,638) |  |  | $ | (890,566) |
| For the Year Ended December 31, 2024
| Derivative Instruments |  | Employee Benefit Plans |  | Currency Translation Adjustments |  | Total
| (In thousands)
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2023 | $ | (3,463) |  |  | $ | (142,916) |  |  | $ | (758,589) |  |  | $ | (904,968) |
Other comprehensive income (loss) before reclassifications | 39,409 |  |  | (819) |  |  | (110,507) |  |  | (71,917) |
Amounts reclassified from accumulated other comprehensive income (loss) | (21,639) |  |  | 4,072 |  |  | — |  |  | (17,567) |
Net change in other comprehensive income (loss) | 17,770 |  |  | 3,253 |  |  | (110,507) |  |  | (89,484) |
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2024 | $ | 14,307 |  |  | $ | (139,663) |  |  | $ | (869,096) |  |  | $ | (994,452) |
| For the Year Ended December 31, 2023
| Derivative Instruments |  | Employee Benefit Plans |  | Currency Translation Adjustments |  | Total
| (In thousands)
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2022 | $ | 22,732 |  |  | $ | (138,498) |  |  | $ | (795,712) |  |  | $ | (911,478) |
Other comprehensive income (loss) before reclassifications | (15,903) |  |  | (6,558) |  |  | 37,123 |  |  | 14,662 |
Amounts reclassified from accumulated other comprehensive income (loss) | (10,292) |  |  | 2,140 |  |  | — |  |  | (8,152) |
Net change in other comprehensive income (loss) | (26,195) |  |  | (4,418) |  |  | 37,123 |  |  | 6,510 |
Accumulated Other Comprehensive Income (Loss), Net of Tax, as of December 31, 2023 | $ | (3,463) |  |  | $ | (142,916) |  |  | $ | (758,589) |  |  | $ | (904,968) |
Schedule of Consolidated Statement of Operations Line Items Affected by Reclassifications from Accumulated Other Comprehensive Income (Loss) | The following table presents the classification and amount of the reclassifications from accumulated other comprehensive income (loss) to the consolidated statements of operations:
| For the Year Ended |  | Consolidated Statements of Operations Classification
| December 31, 2025 |  | December 31, 2024 |  | December 31, 2023 |
| (In thousands) |  |
Derivative Instruments |  |  |  |  |  |  |
(Loss) gain on foreign currency forward exchange and other contracts | $ | (18,181) |  |  | $ | 21,590 |  |  | $ | 9,880 |  |  | Cost of sales
Tax effect | 8 |  |  | 49 |  |  | 412 |  |  | Provision/benefit for income taxes
| $ | (18,173) |  |  | $ | 21,639 |  |  | $ | 10,292 |  |  | Net Income
Employee Benefit Plans |  |  |  |  |  |  |
Amortization of prior service credit (a) | $ | 1,797 |  |  | $ | 1,844 |  |  | $ | 1,888 |  |  | Other non-operating income/expense, net
Recognized actuarial (loss) (a) | (8,391) |  |  | (7,591) |  |  | (5,667) |  |  | Other non-operating income/expense, net
Curtailment gain (a) | 121 |  |  | — |  |  | — |  |  | Other non-operating income/expense, net
Settlement gain (a) | 68 |  |  | — |  |  | 59 |  |  | Other non-operating income/expense, net
| (6,405) |  |  | (5,747) |  |  | (3,720) |  |  |
Tax effect | 1,529 |  |  | 1,675 |  |  | 1,580 |  |  | Provision/benefit for income taxes
| $ | (4,876) |  |  | $ | (4,072) |  |  | $ | (2,140) |  |  | Net Income
(a)The amortization of prior service credit, recognized actuarial loss, curtailment gain, and settlement gain are included in the computation of net periodic benefit cost. Refer to "Note 4 to the Consolidated Financial Statements—Employee Benefit Plans" for additional information regarding Mattel's net periodic benefit cost.

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