Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation and Basis of Preparation	Principles of Consolidation and Basis of Preparation The consolidated financial statements include the accounts of Mattel, Inc. and its subsidiaries. All wholly and majority-owned subsidiaries are consolidated and included in Mattel’s consolidated financial statements. Mattel does not have any minority stock ownership interests in which it has a controlling financial interest that would require consolidation. All significant intercompany accounts and transactions have been eliminated upon consolidation.
Use of Estimates	Use of Estimates Preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could ultimately differ from those estimates.
Cash and Equivalents	Cash and Equivalents Cash and equivalents include short-term investments, which are highly liquid investments with maturities of three months or less when purchased. Such investments are stated at cost, which approximates market value.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Credit is granted to customers on an unsecured basis. Credit limits and payment terms are established based on extensive evaluations made on an ongoing basis throughout the fiscal year of the financial performance, cash generation, financing availability, and liquidity status of each customer. Customers are reviewed at least annually, with more frequent reviews performed as necessary, based on the customers’ financial condition and the level of credit being extended. For customers who are experiencing financial difficulties, management performs additional financial analyses before shipping to those customers on credit. Mattel uses a variety of financial arrangements to ensure collectibility of accounts receivable of customers deemed to be a credit risk, including requiring letters of credit, purchasing various forms of credit insurance with unrelated third parties, factoring, or requiring cash in advance of shipment. Mattel records an allowance for doubtful accounts based on management’s assessment of the business environment, customers’ financial condition, historical collection experience, accounts receivable aging, and customer disputes.
Inventories	Inventories Inventories, net of allowance for obsolescence, are stated at the lower of cost or net realizable value. Expense associated with the allowance for obsolescence is recognized in cost of sales and establishes a lower cost basis for the inventory. Cost is determined by the first-in, first-out method.
Property, Plant, and Equipment	Property, Plant, and Equipment Property, plant, and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over estimated useful lives of 10 to 30 years for buildings, 3 to 15 years for machinery and equipment, 3 to 10 years for software, and 10 to 20 years, not to exceed the lease term, for leasehold improvements. Tools, dies, and molds are depreciated using the straight-line method over 3 years. Estimated useful lives are periodically reviewed and, where appropriate, changes are made prospectively. The carrying value of property, plant, and equipment is reviewed when events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Any potential impairment identified is assessed by evaluating the operating performance and future undiscounted cash flows of the underlying assets. When property is sold or retired, the cost of the property and the related accumulated depreciation are removed from the consolidated balance sheet, and any resulting gain or loss is included in the results of operations.
Goodwill	Goodwill is allocated to various reporting units, which are at the operating segment level, for the purpose of evaluating whether goodwill is impaired. Mattel’s reporting units are: (i) North America, (ii) International, and (iii) American Girl. Components of the operating segments have been aggregated into a single reporting unit as the components have similar economic characteristics. The similar economic characteristics include the nature of the products, the nature of the production processes, the customers, and the manner in which the products are distributed. Mattel tests its goodwill for impairment annually in the third quarter and whenever events or changes in circumstances indicate that the carrying value of a reporting unit may exceed its fair value.
Nonamortizable Intangible Assets	Mattel tests its nonamortizable intangible assets, including trademarks and trade names, for impairment by comparing the estimated fair values of the nonamortizable intangible assets with the carrying values. Mattel tests nonamortizable intangible assets for impairment annually in the third quarter or whenever events or changes in circumstances indicate that the carrying value may exceed its fair value.
Amortizable Intangible Assets	Mattel also tests its amortizable intangible assets, which are primarily comprised of trademarks and trade names, for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recovered.
Foreign Currency Translation Exposure	Foreign Currency Translation Exposure Mattel’s reporting currency is the U.S. dollar. The translation of its net investments in subsidiaries with non-U.S. dollar functional currencies subjects Mattel to the impact of currency exchange rate fluctuations in its results of operations and financial position. Assets and liabilities of subsidiaries with non-U.S. dollar functional currencies are translated into U.S. dollars at year-end exchange rates. Income, expense, and cash flow items are translated at weighted average exchange rates prevailing during the year. The resulting currency translation adjustments are recorded as a component of accumulated other comprehensive loss within stockholders’ equity. Mattel’s primary currency translation exposures in 2017 were related to its net investments in entities having functional currencies denominated in the Euro and British pound sterling.
Foreign Currency Transaction Exposure	Foreign Currency Transaction Exposure Currency exchange rate fluctuations may impact Mattel’s results of operations and cash flows. Mattel’s currency transaction exposures include gains and losses realized on unhedged inventory purchases and unhedged receivables and payables balances that are denominated in a currency other than the applicable functional currency. Gains and losses on unhedged inventory purchases and other transactions associated with operating activities are recorded in the components of operating income in the consolidated statements of operations. Gains and losses on unhedged intercompany loans and advances are recorded as a component of other non-operating expense/income, net in the consolidated statements of operations in the period in which the currency exchange rate changes. Inventory transactions denominated in the Euro, Mexican peso, British pound sterling, Canadian dollar, Australian dollar, Brazilian real, and Russian ruble were the primary transactions that caused foreign currency transaction exposure for Mattel in 2017.
Derivative Instruments	Derivative Instruments Mattel uses foreign currency forward exchange contracts as cash flow hedges primarily to hedge its purchases and sales of inventory denominated in foreign currencies. At the inception of the contracts, Mattel designates these derivatives as cash flow hedges and documents the relationship of the hedge to the underlying transaction. Hedge effectiveness is assessed at inception and throughout the life of the hedge to ensure the hedge qualifies for hedge accounting. Changes in fair value associated with hedge ineffectiveness, if any, are recorded in the results of operations. Changes in fair value of cash flow hedge derivatives are deferred and recorded as part of accumulated other comprehensive loss in stockholders’ equity until the underlying transaction affects earnings. In the event that an anticipated transaction is no longer likely to occur, Mattel recognizes the change in fair value of the derivative in its results of operations in the period the determination is made. Additionally, Mattel uses foreign currency forward exchange contracts to hedge intercompany loans and advances denominated in foreign currencies. Due to the short-term nature of the contracts involved, Mattel does not use hedge accounting for these contracts, and as such, changes in fair value are recorded in the period of change in the consolidated statements of operations.
Revenue Recognition	Revenue is recognized upon shipment or upon receipt of products by the customer, depending on the terms, provided that: there are no uncertainties regarding customer acceptance; persuasive evidence of an agreement exists documenting the specific terms of the transaction; the sales price is fixed or determinable; and collectibility is reasonably assured. Management assesses the business environment, the customer’s financial condition, historical collection experience, accounts receivable aging, and customer disputes to determine whether collectibility is reasonably assured. If collectibility is not considered reasonably assured at the time of sale, Mattel does not recognize revenue until collection occurs. Value added taxes are recorded on a net basis and are excluded from revenue.
Sales Adjustments	Mattel routinely enters into arrangements with its customers to provide sales incentives, support customer promotions, and provide allowances for returns and defective merchandise. Such programs are based primarily on customer purchases, customer performance of specified promotional activities, and other specified factors such as sales to consumers. The costs of these programs are recorded as sales adjustments that reduce gross sales in the period the related sale is recognized.
Advertising and Promotion Costs	Advertising and Promotion Costs Costs of media advertising are expensed the first time the advertising takes place, except for direct-response advertising, which is capitalized and amortized over its expected period of future benefits. Direct-response advertising consists primarily of catalog production and mailing costs, which are generally amortized within three months from the date the catalogs are mailed.
Product Recalls and Withdrawals	Product Recalls and Withdrawals Mattel establishes a reserve for product recalls and withdrawals on a product-specific basis when circumstances giving rise to the recall or withdrawal become known. Facts and circumstances related to the recall or withdrawal, including where the product affected by the recall or withdrawal is located (e.g., with consumers, in customers’ inventory, or in Mattel’s inventory), cost estimates for shipping and handling for returns, cost estimates for communicating the recall or withdrawal to consumers and customers, and cost estimates for parts and labor if the recalled or withdrawn product is deemed to be repairable, are considered when establishing a product recall or withdrawal reserve. These factors are updated and reevaluated each period, and the related reserves are adjusted when these factors indicate that the recall or withdrawal reserve is either not sufficient to cover or exceeds the estimated product recall or withdrawal expenses.
Design and Development Costs	Design and Development Costs Product design and development costs primarily include employee compensation and outside services and are charged to the results of operations as incurred.
Employee Benefit Plans	Employee Benefit Plans Mattel and certain of its subsidiaries have retirement and other postretirement benefit plans covering substantially all employees of these companies. Actuarial valuations are used in determining amounts recognized in the financial statements for certain retirement and other postretirement benefit plans (see "Note 4 to the Consolidated Financial Statements—Employee Benefit Plans").
Share-Based Payments	Share-Based Payments Mattel recognizes the cost of employee share-based payment awards on a straight-line attribution basis over the requisite employee service period, net of estimated forfeitures.
New Accounting Pronouncements Adopted	$4.3 million in discrete tax benefits related to share-based payment accounting. Mattel also elected to apply the change in presentation of excess tax benefits in the statements of cash flows on a prospective basis, and as a result, prior periods were not retroactively adjusted. Excess tax benefits (deficits) in 2016 and 2017 are classified as an operating activity in the statements of cash flows. In 2015, the tax effect of deductions in excess of compensation cost ("windfalls") related to the exercise of nonqualified stock options and vesting of other share-based compensation awards were recorded in equity and tax deficiencies ("shortfalls") were recorded in equity to the extent of previously recognized windfalls.
Income Taxes	Income Taxes Certain income and expense items are accounted for differently for financial reporting and income tax purposes. Deferred income tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities, applying enacted statutory income tax rates in effect for the year in which the differences are expected to reverse. In the normal course of business, Mattel is regularly audited by federal, state, local, and foreign tax authorities. The ultimate settlement of any particular issue with the applicable taxing authority could have a material impact on Mattel’s consolidated financial statements.
Venezuelan Operations	Venezuelan Operations Since January 1, 2010, Mattel has accounted for Venezuela as a highly inflationary economy as the three-year cumulative inflation rate for Venezuela exceeded 100%. Accordingly, Mattel’s Venezuelan subsidiary used the U.S. dollar as its functional currency, and monetary assets and liabilities denominated in Venezuelan bolívar fuerte ("BsF") generate income or expense for changes in value associated with foreign currency exchange rate fluctuations against the U.S. dollar. From January 2010 through January 2013, Mattel’s Venezuelan subsidiary used the Sistema de Transacciones con Títulos en Moneda Extranjera ("SITME") rate, which was quoted at 5.30 BsF per U.S. dollar as of December 31, 2012, to remeasure monetary assets and liabilities denominated in BsF. During February 2013, the Central Bank of Venezuela revised its official exchange rate to 6.30 BsF per U.S. dollar and eliminated the SITME rate. During March 2013, the Venezuelan government introduced a complementary currency exchange system, the Sistema Complementario de Administración de Divisas 1 ("SICAD 1"). SICAD 1 was intended to function as an auction system, allowing entities in specific sectors to bid for U.S. dollars to be used for specified import transactions. During February 2014, the Venezuelan government introduced an additional currency exchange system, the Sistema Complementario de Administración de Divisas 2 ("SICAD 2"), which was expected to provide a greater supply of U.S. dollars from sources other than the Venezuelan government and increase participation to all sectors and companies. During February 2015, the Venezuelan government announced the launch of a new three-tiered currency exchange platform, which included a new exchange system called the Marginal Currency System ("SIMADI"). The first tier was used for food, medicine, agriculture, and other essential goods and used an official exchange rate of 6.30 BsF per U.S. dollar. The second tier was a merger of the SICAD 1 and SICAD 2 systems, which held periodic auctions for entities in specific sectors. The third tier was the new SIMADI system, which was intended to be a market-driven exchange that allowed for legal trading of foreign currency based on supply and demand. During March 2016, the Venezuelan government further revised its currency exchange platform to a dual system. The SICAD rate merged with the official exchange rate, becoming the new Tipo de Cambio Protegido ("DIPRO") exchange rate, which was fixed at 10.00 BsF per U.S. dollar. The existing SIMADI rate was renamed the Tipo de Cambio Complementario ("DICOM") exchange rate. The DIPRO rate is used for essential imports, such as food and medicine, whereas the DICOM rate is used for all other transactions. During the first quarter of 2016, Mattel changed its remeasurement rate from the official exchange rate to the new DICOM exchange rate. The change in the remeasurement rate resulted in an unrealized foreign currency exchange loss of approximately $26 million, which was recognized in other non-operating expense/income, net in the consolidated statements of operations in the first quarter of 2016. During May 2017, the Venezuelan government initiated an auction mechanism within the DICOM exchange rate system, which was not accessed by Mattel. During December 2017, Mattel initiated actions to discontinue operations in Venezuela and concluded that its Venezuelan subsidiary had been substantially liquidated. In connection with the substantial liquidation, Mattel recognized a $59.0 million loss in other non-operating income/expense, net in the consolidated statements of operations related to the associated cumulative translation adjustments.
United Kingdom Operations	United Kingdom Operations During June 2016, the referendum by British voters to exit the European Union ("Brexit") adversely impacted global markets and resulted in a sharp decline of the British pound sterling against the U.S. dollar. In February 2017, the British Parliament voted in favor of allowing the British government to begin the formal process of Brexit and discussions with the European Union began in March 2017. In the short-term, volatility in the British pound sterling could continue as the United Kingdom negotiates its anticipated exit from the European Union. In the longer term, any impact from Brexit on Mattel's United Kingdom operations will depend, in part, on the outcome of tariff, trade, regulatory, and other negotiations. Mattel's United Kingdom operations represented approximately 4% of Mattel's consolidated net sales for the year ended December 31, 2017.
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers, which supersedes the revenue recognition requirements in Accounting Standards Codification ("ASC") 605, Revenue Recognition, and most industry-specific guidance. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The new guidance establishes a five-step model to achieve that core principle and also requires additional disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts. ASU 2014-09 was originally effective for interim and annual reporting periods beginning after December 15, 2016. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers – Deferral of the Effective Date, which defers the effective date to annual reporting periods beginning after December 15, 2017. Early application is permitted after December 15, 2016. In March 2016, the FASB issued ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which clarifies the implementation guidance on principal versus agent considerations, and ASU 2016-10, Identifying Performance Obligations and Licensing, which clarifies the identification of performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers - Narrow-Scope Improvements and Practical Expedients, which clarifies guidance on assessing collectibility, presenting sales taxes and other similar taxes collected from customers, measuring noncash consideration, and certain transition matters. ASU 2014-09, ASU 2015-14, ASU 2016-08, ASU 2016-10, and ASU 2016-12 (collectively, the "new revenue standards") will be effective for interim and annual reporting periods beginning on January 1, 2018. During the fourth quarter of 2017, Mattel substantially completed its assessment of the impact of the new revenue standards on its revenue recognition accounting policy and its consolidated financial statements. Upon adoption of the new revenue standards on January 1, 2018, Mattel will recognize a cumulative effect reduction to the opening balance of its retained earnings of approximately $29 million associated with certain licensing contracts. Prior periods will not be retrospectively adjusted. In February 2016, the FASB issued ASU 2016-02, Leases, which requires a lessee to recognize a lease asset and lease liability on its balance sheet for all leases with a term greater than 12 months. ASU 2016-02 will be effective for interim and annual reporting periods beginning on January 1, 2019. Mattel is currently evaluating the impact of the adoption of ASU 2016-02 on its operating results and financial position, which based on a preliminary assessment, is expected to have a material impact on its financial position. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows - Classification of Certain Cash Receipts and Cash Payments, which adds and clarifies guidance on the classification of certain cash receipts and payments in the statement of cash flows, including proceeds from insurance claim settlements, proceeds from the settlement of corporate-owned life insurance, and distributions received from equity method investees. ASU 2016-15 will be effective for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2016-15 to have a material effect on its operating results or financial position. In October 2016, the FASB issued ASU 2016-16, Income Taxes: Intra-Entity Transfers of Assets Other Than Inventory, which requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. ASU 2016-16 will be effective for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2016-16 to have a material effect on its operating results or financial position. In January 2017, the FASB issued ASU 2017-01, Business Combinations: Clarifying the Definition of a Business, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses and refines the definition of the term output. ASU 2017-01 will be effective for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2017-01 to have a material effect on its operating results or financial position. In February 2017, the FASB issued ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets, which clarifies the scope on recently established guidance on nonfinancial asset derecognition as well as the accounting for partial sales of nonfinancial assets. ASU 2017-05 will be effective for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2017-05 to have a material effect on its operating results or financial position. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, which requires entities that sponsor defined benefit plans to (i) present service cost within operations, if such a subtotal is presented, (ii) other components of net benefit costs should be presented separately outside of income from operations, if such a subtotal is presented, and (iii) only the service cost component should be capitalized, when applicable. If a separate line item is not used, the line item in the income statement where the other components of net benefit costs are included must be disclosed. Further, gains and losses from curtailments and settlements, and the cost of certain termination benefits should be reported in the same manner as other components of net benefit cost. ASU 2017-07 will be effective for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2017-07 to have a material effect on its operating results or financial position. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation: Scope of Modification Accounting, which clarifies when to account for a change to the terms or conditions of a share-based payment award as a modification. ASU 2017-09 will be effective prospectively for interim and annual reporting periods beginning on January 1, 2018. Mattel does not expect the adoption of ASU 2017-09 to have a material effect on its operating results or financial position. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities, which expands the hedging strategies eligible for hedge accounting and changes both how companies assess hedge effectiveness and presentation and disclosure requirements. ASU 2017-12 will be effective for interim and annual reporting periods beginning on January 1, 2019. Early application is permitted in any interim period after issuance of the update. Mattel is currently evaluating the impact of the adoption of ASU 2017-12 on its operating results and financial position.
Income Tax Uncertainties and Unrecognized Tax Benefits Policy	In assessing whether uncertain tax positions should be recognized in its financial statements, Mattel first determines whether it is more-likely-than-not that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. In evaluating whether a tax position has met the more-likely-than-not recognition threshold, Mattel presumes that the position will be examined by the appropriate taxing authority that would have full knowledge of all relevant information. For tax positions that meet the more-likely-than-not recognition threshold, Mattel measures the amount of benefit recognized in the financial statements at the largest amount of benefit that is greater than 50 percent likely of being realized upon ultimate settlement. Mattel recognizes unrecognized tax benefits in the first financial reporting period in which information becomes available indicating that such benefits will more-likely-than-not be realized. Mattel
Debt Policy	Seasonal Financing On December 20, 2017, Mattel entered into a syndicated facility agreement (the “Credit Agreement”), as a borrower thereunder (in such capacity, the “Borrower”), along with certain of Mattel’s domestic subsidiaries, as additional borrowers thereunder (together with the Borrower, the “U.S. Borrowers”), Mattel Canada Inc. as a borrower thereunder (the “Canadian Borrower”), certain additional domestic and foreign subsidiaries of Mattel, as guarantors thereunder, Bank of America, N.A., as global administrative agent, collateral agent, Australian security trustee, and lender, and the other lenders and financial institutions party thereto, providing for $1.60 billion in aggregate principal amount of senior secured revolving credit facilities (the “new senior secured revolving credit facilities”), consisting of an asset based lending facility with aggregate commitments of approximately $1.31 billion, subject to borrowing base capacity, and a revolving credit facility with $294.0 million in aggregate commitments secured by certain fixed assets and intellectual property of the U.S. Borrowers and certain equity interests in various subsidiaries of Mattel, subject to borrowing base capacity (the “Fixed Asset & IP Facility”). The new senior secured revolving credit facilities will mature on December 20, 2020. A portion of the new senior secured revolving credit facilities (the “U.S. Subfacility”) is currently available to the U.S. Borrowers. A portion of the new senior secured revolving credit facilities (the “Canadian Subfacility”) is also currently available to the “Canadian Borrower”. Upon the satisfaction of various deliverables and other conditions, other international subsidiaries of Mattel will join the Credit Agreement as borrowers and portions of the new senior secured revolving credit facilities will also become available to such borrowers, including (i) a portion (the “French Subfacility”) to Mattel France (the “French Borrower”), (ii) a portion (the “Spanish Subfacility”) to Mattel España, S.A. (the “Spanish Borrower”), (iii) a portion (the “European (GNU) Subfacility”) to Mattel Europa B.V., Mattel U.K. Limited, HIT Entertainment Limited, Gullane (Thomas) Limited, and Mattel GMBH (collectively, the “European (GNU) Borrowers”) and (iv) a portion (the “Australian Subfacility”) to Mattel Pty Ltd. (the “Australian Borrower”). Borrowings under the new senior secured revolving credit facilities will (i) be limited by jurisdiction-specific borrowing base calculations based on the sum of specified percentages of eligible accounts receivable, eligible inventory and certain fixed assets and intellectual property, as applicable, minus the amount of any applicable reserves, and (ii) bear interest at a floating rate, which can be either, at the Borrower’s option, (a) an adjusted LIBOR rate plus an applicable margin ranging from 1.25% to 3.00% per annum or (b) an alternate base rate plus an applicable margin ranging from 0.25% to 2.00% per annum, in each case, such applicable margins to be determined based on the Borrower’s average borrowing availability remaining under the new senior secured revolving credit facilities. In addition to paying interest on the outstanding principal under the new senior secured revolving credit facilities, the Borrower will be required to pay (i) an unused line fee per annum of the average daily unused portion of the new senior secured revolving credit facilities; (ii) a letter of credit fronting fee based on a percentage of the aggregate face amount of outstanding letters of credit; and (iii) certain other customary fees and expenses of the lenders and agents. The U.S. Borrowers, as well as certain U.S. subsidiaries of the Borrower (the “U.S. Guarantors”), are initially guaranteeing the obligations of all Borrowers under the new senior secured revolving credit facilities. Additionally, the obligations of the Canadian Borrower, the French Borrower, the Spanish Borrower, the European (GNU) Borrowers and the Australian Borrower (collectively, the “Foreign Borrowers”), will respectively each be guaranteed by the obligations of the other Foreign Borrowers, as well as certain additional foreign subsidiaries (“Foreign Guarantors”). The U.S. Subfacility is secured by liens on substantially all of the U.S. Borrowers’ and the U.S. Guarantors’ accounts receivable and inventory (the “U.S. Current Assets Collateral”). The Canadian Subfacility is, and the French Subfacility, the Spanish Subfacility, the European (GNU) Subfacility and the Australian Subfacility will be, each secured by a first priority lien on (i) the accounts receivable and inventory of the applicable Foreign Borrower(s) and Foreign Guarantors under such facility, and (ii) the U.S. Current Assets Collateral. The Fixed Asset & IP Facility is secured by a first priority lien on certain owned real property in the U.S., certain U.S. trademarks and patents and 100% of the equity interests in the U.S. Borrowers (aside from Mattel) and U.S. Guarantors, as well as 65% of the voting equity interests and 100% of the non-voting equity interests in Mattel Holdings Limited. Upon the additional Foreign Borrowers and Foreign Guarantors joining the Credit Agreement, the Fixed Asset & IP Facility will also be secured by 65% of the voting equity interests of such additional Foreign Borrowers and Foreign Guarantors that are directly owned by a U.S. Borrower or U.S. Guarantor. The book value of the accounts receivable and inventory of the U.S. Borrowers, U.S. Guarantors, Canadian Borrower and the current Foreign Guarantor of the Canadian Subfacility, together with the non-current assets currently pledged as collateral under the new senior secured revolving credit facilities was approximately $900 million as of December 31, 2017. The Credit Agreement contains customary covenants, including, but not limited to, restrictions on the Borrower’s and its subsidiaries’ ability to merge and consolidate with other companies, incur indebtedness, grant liens or security interests on assets, make acquisitions, loans, advances or investments, pay dividends, sell or otherwise transfer assets outside of the ordinary course, optionally prepay or modify terms of any junior indebtedness, enter into transactions with affiliates or change their line of business. The Credit Agreement requires the maintenance of a fixed charge coverage ratio of 1.00 to 1.00 at the end of each fiscal quarter when excess availability under the new senior secured revolving credit facilities is less than the greater of (x) $100 million and (y) 10% of the aggregate amount available thereunder (the “Availability Threshold”) and on the last day of each subsequent fiscal quarter ending thereafter until no event of default exists and excess availability is greater than the Availability Threshold for at least 30 consecutive days. Since Mattel had no borrowings to-date under the new senior secured revolving credit facilities, the fixed charge coverage ratio covenant was not in effect as of December 31, 2017. As of December 31, 2017, Mattel was in compliance with all covenants contained in the Credit Agreement. The Credit Agreement is a material agreement, and failure to comply with the covenants may result in an event of default under the terms of the new senior secured revolving credit facilities. If Mattel were to default under the terms of the new senior secured revolving credit facilities, its ability to meet its seasonal financing requirements could be adversely affected. Furthermore, in connection with the entry into the new senior secured revolving credit facilities, Mattel terminated the commitments and satisfied all outstanding obligations under its previous Credit Agreement, amended on June 8, 2015 (the "previous Credit Agreement"). The previous Credit Agreement, governing an unsecured committed revolving credit facility (the "previous Credit Facility") was used as a back-up to Mattel’s commercial paper program. The aggregate commitments under the previous Credit Facility was $1.60 billion. Applicable interest rate margins were within a range of 0.00% to 0.75% above the applicable base rate for base rate loans and 0.88% to 1.75% above the applicable LIBOR for Eurodollar rate loans, and the commitment fees ranged from 0.08% to 0.25% of the unused commitments under the Credit Facility, in each case depending on Mattel’s senior unsecured long-term debt rating. To finance seasonal working capital requirements of certain foreign subsidiaries, Mattel avails itself of individual short-term credit lines with a number of banks. As of December 31, 2017, foreign credit lines totaled approximately $110 million. Mattel expects to extend the majority of these credit lines throughout 2018. Mattel believes its cash on hand, amounts available under the new senior secured revolving credit facilities, and its foreign credit lines will be adequate to meet its seasonal financing requirements in 2018. Additionally, sales of foreign receivables occur periodically to finance seasonal working capital requirements. The outstanding amounts of accounts receivable that have been sold under international factoring arrangements were approximately $19 million and $18 million at December 31, 2017 and 2016, respectively. These amounts have been excluded from Mattel’s consolidated balance sheets.
Earnings Per Share Policy	Unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and are included in the computation of earnings per share pursuant to the two-class method. Certain of Mattel’s RSUs are considered participating securities because they contain nonforfeitable rights to dividend equivalents. Under the two-class method, net income is reduced by the amount of dividends declared in the period for each class of common stock and participating securities. The remaining undistributed earnings are then allocated to common stock and participating securities as if all of the net income for the period had been distributed. Basic earnings per common share excludes dilution and is calculated by dividing net income allocable to common shares by the weighted average number of common shares outstanding for the period. Diluted earnings per common share is calculated by dividing net income allocable to common shares by the weighted average number of common shares for the period, as adjusted for the potential dilutive effect of non-participating share-based awards.
Segment Information	Mattel does not include sales adjustments such as trade discounts and other allowances in the calculation of segment revenues (referred to as "gross sales"). Mattel records these adjustments in its financial accounting systems at the time of sale to each customer, but the adjustments are not allocated to individual products. For this reason, Mattel’s CODM uses gross and net sales by segment as metrics to measure segment performance. Such sales adjustments are included in the determination of segment loss/income from operations based on the adjustments recorded in the financial accounting systems. Segment loss/income represents each segment’s operating loss/income, while consolidated operating loss/income represents loss/income from operations before net interest, other non-operating expense/income, net, and income taxes as reported in the consolidated statements of operations. The corporate and other expense category includes costs not allocated to individual segments, including charges related to incentive compensation, severance and other termination-related costs, share-based payments, and corporate headquarters functions managed on a worldwide basis, and the impact of changes in foreign currency exchange rates on intercompany transactions.