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Employee Benefit Plans - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2017
Employee Benefits Disclosure [Line Items]        
Accumulated benefit obligation of defined benefit pension plans $ 409,600,000 $ 445,200,000    
Discount rate 5.30% 4.70%    
Total estimated cash contributions to be made during the next fiscal year for defined benefit pension and postretirement benefit plans $ 21,000,000      
Percentage of domestic defined benefit pension plan assets to total defined benefit pension plan assets 79.00%      
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 $ 56,900,000 $ 53,300,000    
Cash surrender value of life insurance policies 97,100,000 87,100,000    
Expense for incentive compensation plans $ 150,900,000 $ 137,800,000 $ 0  
Defined benefit pension plans        
Employee Benefits Disclosure [Line Items]        
Discount rate 5.30% 4.70%    
Long-term rate of return on plan assets used to determine net periodic benefit cost for domestic defined benefit pension plans 6.20% 5.00% 5.00%  
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%