Cash received from financing provider that has not been recognized as revenue.

No definition available.

Name:	jnpr_CashReceivedFromFinancingProviderThatHasNotBeenRecognizedAsRevenue
Namespace Prefix:	jnpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Redemption, Discount Rate, Basis Spread on Variable Rate

+ References

No definition available.

+ Details

Name:	jnpr_DebtInstrumentRedemptionDiscountRateBasisSpreadonVariableRate
Namespace Prefix:	jnpr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Redemption, Redemption Period

+ References

No definition available.

+ Details

Name:	jnpr_DebtInstrumentRedemptionRedemptionPeriod
Namespace Prefix:	jnpr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	jnpr_FinancingArrangementsAbstract
Namespace Prefix:	jnpr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum term for guarantees relating to third-party financing arrangements

+ References

No definition available.

+ Details

Name:	jnpr_Maximumtermforguaranteesrelatingtothirdpartyfinancingarrangements
Namespace Prefix:	jnpr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	jnpr_NumberOfDaysDueFromReceivable
Namespace Prefix:	jnpr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Receivables from sale of receivables.

+ References

No definition available.

+ Details

Name:	jnpr_ReceivablesFromSaleOfReceivables
Namespace Prefix:	jnpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Repurchase Price Percentage Related to Change of Control

+ References

No definition available.

+ Details

Name:	jnpr_RepurchasePricePercentageRelatedtoChangeofControl
Namespace Prefix:	jnpr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Sale of trade receivable.

+ References

No definition available.

+ Details

Name:	jnpr_SaleOfReceivable
Namespace Prefix:	jnpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Short-term Debt, Gross Due 2016

+ References

No definition available.

+ Details

Name:	jnpr_ShorttermDebtGross
Namespace Prefix:	jnpr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with the proceeds from sale and collection of receivables during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

+ Details

Name:	us-gaap_ProceedsFromSaleAndCollectionOfReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.(a),16(a)(1))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Subparagraph a(1)

-Article 7

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2, 3

-Article 9

+ Details

Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_FixedRateNoteDue2016Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_Fixedratenotedue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_FixedRateNoteDue2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_FixedRateNoteDue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_FixedRateNoteDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_FixedRateNoteDue2041Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=jnpr_OtherFixedRateNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=jnpr_FinancingguaranteewithrecourseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt and Financing (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2011
Long-Term Debt [Line Items]
Long-term debt, gross	$ 1,950.0us-gaap_DebtInstrumentCarryingAmount
Unaccreted discount	(1.4)
Long-term Debt	1,948.6
Short-term debt	299.9us-gaap_ShortTermBorrowings		0us-gaap_ShortTermBorrowings
Long-term debt	1,648.7us-gaap_LongTermDebtNoncurrent		1,349.0us-gaap_LongTermDebtNoncurrent
Redemption percent due to change in control	101.00%
Financing Arrangements [Abstract]
Sale of receivable	47.1jnpr_SaleOfReceivable	133.0jnpr_SaleOfReceivable
Proceeds from sale and collection of receivables	60.0	192.3
Receivables from sale of receivables	15.1jnpr_ReceivablesFromSaleOfReceivables	28.0jnpr_ReceivablesFromSaleOfReceivables
Maximum term for guarantees related to third-party financing arrangements	4 years
Cash received from financing provider that has not been recognized as revenue	13.3		67.5
Financing guarantee with recourse [Member]
Financing Arrangements [Abstract]
Guarantor obligations, current carrying value	11.1
Minimum [Member]
Financing Arrangements [Abstract]
Number of days due from receivable	30 days
Maximum [Member]
Financing Arrangements [Abstract]
Number of days due from receivable	90 days
Fixed rate note due 2016 [Member]
Long-Term Debt [Line Items]
Short-term debt, gross	300.0			300.0
Effective interest rate	3.25%
Long-term debt, stated interest rate	3.10%			3.10%
Fixed rate note due 2020 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross	300.0
Effective interest rate	3.47%
Long-term debt, stated interest rate	3.30%
Redemption period	1 month
Fixed rate note due 2020 [Member] \| One Month Prior to Maturity [Member]
Long-Term Debt [Line Items]
Redemption price	100.00%
Fixed rate note due 2020 [Member] \| Three Months Prior to Maturity [Member] \| Treasury Rate [Member]
Long-Term Debt [Line Items]
Redemption discount rate, basis spread on variable rate	0.30%
Fixed rate note due 2020 [Member] \| On or After May 15, 2020 [Member]
Long-Term Debt [Line Items]
Redemption price	100.00%
Fixed rate note due 2021 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross	300.0			300.0
Effective interest rate	4.69%
Long-term debt, stated interest rate	4.60%			4.60%
Fixed rate note due 2024 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross	350.0	350.0
Effective interest rate	4.63%
Long-term debt, stated interest rate	4.50%	4.50%
Fixed rate note due 2025 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross	300.0
Effective interest rate	4.47%
Long-term debt, stated interest rate	4.35%
Redemption period	3 months
Fixed rate note due 2025 [Member] \| One Month Prior to Maturity [Member] \| Treasury Rate [Member]
Long-Term Debt [Line Items]
Redemption discount rate, basis spread on variable rate	0.375%
Fixed rate note due 2025 [Member] \| Three Months Prior to Maturity [Member]
Long-Term Debt [Line Items]
Redemption price	100.00%
Fixed rate note due 2025 [Member] \| On or After March 15, 2025 [Member]
Long-Term Debt [Line Items]
Redemption price	100.00%
Fixed rate note due 2041 [Member]
Long-Term Debt [Line Items]
Long-term debt, gross	$ 400.0			$ 400.0
Effective interest rate	6.03%
Long-term debt, stated interest rate	5.95%			5.95%
Other Fixed Rate Notes [Member]
Long-Term Debt [Line Items]
Redemption price	100.00%