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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Employee Benefits Disclosure [Line Items] |  |  |
Accumulated benefit obligation of defined benefit pension plans | $ 408.8 | $ 409.6 |
Discount rate | 5.00% | 5.30% |
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans | $ 14.0 |  |
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 | $ 60.9 | $ 56.9 |
Cash surrender value of life insurance policies | 109.7 | 97.1 |
Expense for incentive compensation plans | $ 83.4 | $ 150.9 | $ 137.8
Defined benefit pension plans |  |  |
Employee Benefits Disclosure [Line Items] |  |  |
Discount rate | 5.00% | 5.30% |
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans | 6.20% | 6.20% | 5.00%

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (j)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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