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Employee Benefit Plans - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017
Employee Benefits Disclosure [Line Items] |  |  |  |
Accumulated benefit obligation of defined benefit pension plans | $ 595.4 | $ 652.7 |  |
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans | $ 6.0 |  |  |
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets | 76.00% |  |  |
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 | $ 62.8 | 59.9 |  |
Cash surrender value of life insurance policies | 88.6 | 79.9 |  |
Expense for incentive compensation plans | $ 137.1 | $ 122.5 | $ 119.5 |
Defined benefit pension plans |  |  |  |
Employee Benefits Disclosure [Line Items] |  |  |  |
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans | 5.00% | 5.50% | 6.00% |
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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