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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Mar. 31, 2016
Adjustments for new accounting pronouncements [Line Items]    
Expected reduction in debt liabilities $ (1,948.6)us-gaap_DebtLongtermAndShorttermCombinedAmount  
Scenario, Forecast [Member] | Subsequent Event [Member] | ASU No. 2015-03 [Member]    
Adjustments for new accounting pronouncements [Line Items]    
Expected reduction in debt issuance cost asset   11.0us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= jnpr_AccountingStandardsUpdate201503Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Expected reduction in debt liabilities   $ 11.0us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= jnpr_AccountingStandardsUpdate201503Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember