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Description of Business and Basis of Presentation	12 Months Ended
Description of Business and Basis of Presentation	Dec. 31, 2017
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 sells high-performance routing, switching, and security networking products and service offerings to customers within its verticals: Cloud, Telecom/Cable, and Strategic Enterprise who view the network as critical to their success. In addition to the Company's products, the Company offers services, including technical support, professional services, and education and training programs to its customers. 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. Excess tax benefits from share-based compensation in prior periods have been reclassified to conform to the current-period presentation in the Consolidated Statements of Cash Flows upon adoption of the accounting standard described in Note 2, Significant Accounting Policies. In addition, certain amounts in the Consolidated Statements of Cash Flows have been reclassified to conform to the current-period presentation.