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Description of Business and Basis of Presentation	12 Months Ended
Description of Business and Basis of Presentation	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business Juniper Networks, Inc. (the “Company” or “Juniper”) designs, develops, and sells products and services for high-performance networks, to enable customers to build scalable, reliable, secure and cost-effective networks for their businesses, while achieving agility, efficiency and value through automation. The Company serves the high-performance networking requirements for global service providers, cloud environments, enterprises, governments, and research and public sector organizations that view the network as critical to their success. In addition to the Company's products, the Company offers technical support and professional services, as well as education and training programs to its customers. Together, the high-performance product and service offerings help the Company's customers convert legacy networks that provide commoditized services into more valuable assets that provide differentiation, value, and increased performance, reliability, and security to end-users. Basis of Presentation The Consolidated Financial Statements, which include the Company and its wholly-owned subsidiaries, are prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”). All intercompany balances and transactions have been eliminated. Certain amounts in the prior-years Consolidated Financial Statements have been reclassified to conform to the current-year presentation, including the adoption of Accounting Standards Update ("ASU") No. 2015-17, Balance Sheet Classification of Deferred Taxes, which requires that deferred tax assets and liabilities be classified as noncurrent on the Consolidated Balance Sheets. The guidance is effective for all annual periods, and interim periods within those annual periods, beginning after December 15, 2016, with early adoption permitted. The Company has early adopted this standard effective December 31, 2015, retrospectively. The adoption resulted in a $261.0 million and $147.0 million decrease in current deferred tax assets and a decrease of $207.0 million and $107.4 million in other long-term liabilities as of December 31, 2015 and 2014, respectively on the Consolidated Balance Sheets. The adoption of ASU No. 2015-17 had no impact to the Company’s Consolidated Statements of Operations.