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Summary of Significant Accounting Policies - Remeasurement (Details)
$ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
VEF / $
Feb. 28, 2015
VEF / $
Feb. 28, 2013
VEF / $
Dec. 31, 2012
VEF / $
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]          
Gain (loss) on disposition of business $ (59.0)        
United Kingdom          
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 for .01 value) 4.00%        
Pro Forma          
Financial Statement Line Items with Differences in Reported Amount and Reporting Currency Denominated Amounts [Line Items]          
Exchange rate for translation (in VEF) | VEF / $   10.00 6.30 6.30 5.30
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