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Summary of Significant Accounting Policies - Remeasurement (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2017
Mar. 31, 2016
Dec. 31, 2018
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]      
Gain (loss) on disposition of business $ (59.0)    
Argentina      
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]      
Percentage of subsidiary net sales to Mattel's consolidated net sales (less than)     1.00%
Venezuelan bolívar fuerte      
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]      
Foreign currency transaction loss, unrealized   $ 26.0