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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 |  |  |

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