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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present information about Mattel's financial assets and liabilities measured and reported in the financial statements at fair value on a recurring basis as of December 31, 2025 and 2024 and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value. The three levels of the fair value hierarchy are as follows: •Level 1 – Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. •Level 2 – Valuations based on quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities. •Level 3 – Valuations based on inputs that are unobservable, supported by little or no market activity, and significant to the fair value of the assets or liabilities.
| December 31, 2025
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Assets: |  |  |  |  |  |  |
Foreign currency forward exchange and other contracts (a) | $ | — |  |  | $ | 1,338 |  |  | $ | — |  |  | $ | 1,338 |
Liabilities: |  |  |  |  |  |  |
Foreign currency forward exchange and other contracts (a) | $ | — |  |  | $ | 16,333 |  |  | $ | — |  |  | $ | 16,333 |
| December 31, 2024
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In thousands)
Assets: |  |  |  |  |  |  |
Foreign currency forward exchange and other contracts (a) | $ | — |  |  | $ | 22,031 |  |  | $ | — |  |  | $ | 22,031 |
Liabilities: |  |  |  |  |  |  |
Foreign currency forward exchange and other contracts (a) | $ | — |  |  | $ | 2,337 |  |  | $ | — |  |  | $ | 2,337 |
(a)The fair value of the foreign currency forward exchange and other contracts was based on dealer quotes of market forward rates and reflects the amount that Mattel would receive or pay at their maturity dates for contracts involving the same notional amounts, currencies, and maturity dates.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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