Juniper Networks (JNPR) 10-Q 5 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	JUNIPER NETWORKS INC
Entity Central Index Key	1,043,604
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		385,852,233

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net revenues:
Product	$ 925.4	$ 809.5	$ 2,589.2	$ 2,614.7
Service	323.2	316.4	949	910.8
Total net revenues	1,248.6	1,125.9	3,538.2	3,525.5
Cost of revenues:
Product	322.6	290	923.1	975.9
Service	128.6	121.1	378.9	366.5
Total cost of revenues	451.2	411.1	1,302	1,342.4
Gross margin	797.4	714.8	2,236.2	2,183.1
Operating expenses:
Research and development	247	253.2	747.3	772.7
Sales and marketing	235.3	249.2	687.9	780.6
General and administrative	57.1	55	168.6	190.5
Restructuring and other (benefits) charges	0	(15)	(0.5)	157.2
Total operating expenses	539.4	542.4	1,603.3	1,901
Operating income	258	172.4	632.9	282.1
Other (expense) income, net	(8.4)	(6.8)	(41.3)	326
Income before income taxes	249.6	165.6	591.6	608.1
Income tax provision	51.9	62	155.7	172.8
Net income	$ 197.7	$ 103.6	$ 435.9	$ 435.3
Net income per share:
Basic, in dollars per share	$ 0.52	$ 0.23	$ 1.11	$ 0.93
Diluted, in dollars per share	$ 0.51	$ 0.23	$ 1.09	$ 0.91
Shares used in computing net income per share:
Basic (in shares)	382.8	448.4	393.2	468.1
Diluted (in shares)	389.2	454.8	401.2	477
Cash dividends declared per common stock (in dollar per share)	$ 0.10	$ 0.10	$ 0.3	$ 0.10

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 197.7	$ 103.6	$ 435.9	$ 435.3
Available-for-sale securities:
Unrealized (losses) gains on available-for-sale securities, net of tax (provisions) benefit of ($3.7) and ($2.1) during the three and nine months ended September 30, 2015, respectively, and $2.0 and ($26.2) for the corresponding periods of the fiscal year ended December 31, 2014 (fiscal 2014), respectively	(3.6)	(4.4)	4.6	44
Reclassification adjustment for realized net gains on available-for-sale securities included in net income, net of tax provisions of zero during the three and nine months ended September 30, 2015, respectively, and $0.1 and $60.5 for the corresponding periods of fiscal 2014, respectively	(0.1)	(0.2)	(0.6)	(104)
Net change on available-for-sale securities, net of taxes	(3.7)	(4.6)	4	(60)
Cash flow hedges:
Unrealized (losses) gain on cash flow hedges, net of tax benefit (provisions) of $0.5 and ($0.2) during the three and nine months ended September 30, 2015, respectively, and zero and ($1.3) for the corresponding periods of fiscal 2014, respectively	(1.4)	(2.8)	(5.4)	0.4
Reclassification adjustment for realized net losses (gains) on cash flow hedges included in net income, net of tax (benefit) provisions of ($0.1) and zero during the three and nine months ended September 30, 2015, respectively, and $0.5 and $0.8 for the corresponding periods of fiscal 2014, respectively	1.8	(1)	8.7	(4.2)
Net change on cash flow hedges, net of taxes	0.4	(3.8)	3.3	(3.8)
Change in foreign currency translation adjustments	(8.8)	(7.7)	(12.9)	(3.8)
Other comprehensive loss, net of tax	(12.1)	(16.1)	(5.6)	(67.6)
Comprehensive income	$ 185.6	$ 87.5	$ 430.3	$ 367.7

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income Parentheticals (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Tax benefit (provision) on change in unrealized (losses) gains on available-for-sale securities	$ (3.7)	$ 2	$ (2.1)	$ (26.2)
Tax provision on reclassification adjustment for realized net gains on available-for-sale securities included in net income	0	0.1	0	60.5
Tax benefit (provision) on change in unrealized gains (losses) on cash flow hedges	0.5	0	(0.2)	(1.3)
Tax provision on reclassification adjustment for realized losses (gains) included in net income	$ (0.1)	$ 0.5	$ 0	$ 0.8

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 1,453.5	$ 1,639.6
Short-term investments	529.9	332.2
Accounts receivable, net of allowances	577.5	598.9
Deferred tax assets, net	198.4	147
Prepaid expenses and other current assets	138.8	239.9
Total current assets	2,898.1	2,957.6
Property and equipment, net	959.9	904.3
Long-term investments	1,263.6	1,133.1
Restricted cash and investments	33.9	46
Purchased intangible assets, net	39.2	62.4
Goodwill	2,981.3	2,981.5
Other long-term assets	329.9	303.9
Total assets	8,505.9	8,388.8
Current liabilities:
Short-term debt	299.9	0
Accounts payable	209.1	234.6
Accrued compensation	193.7	225
Deferred revenue	814.4	780.8
Other accrued liabilities	217.8	273
Total current liabilities	1,734.9	1,513.4
Long-term debt	1,648.7	1,349
Long-term deferred revenue	310.5	294.9
Long-term income taxes payable	185	177.5
Other long-term liabilities	198.7	134.9
Total liabilities	$ 4,077.8	$ 3,469.7
Commitments and contingencies (Note 15)
Stockholders' equity:
Convertible preferred stock, $0.00001 par value; 10.0 shares authorized; none issued and outstanding	$ 0	$ 0
Common stock, $0.00001 par value; 1,000.0 shares authorized; 384.8 shares and 416.2 shares issued and outstanding as of September 30, 2015 and December 31, 2014, respectively	0	0
Additional paid-in capital	8,334.3	8,794
Accumulated other comprehensive loss	(19.4)	(13.8)
Accumulated deficit	(3,886.8)	(3,861.1)
Total stockholders' equity	4,428.1	4,919.1
Total liabilities and stockholders' equity	$ 8,505.9	$ 8,388.8

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets Parentheticals (Unaudited) - $ / shares	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Convertible preferred stock - par value (in dollars per share)	$ 0.00001	$ 0.00001
Convertible preferred stock - shares authorized	10,000,000	10,000,000
Convertible preferred stock - issued	0	0
Convertible preferred stock - outstanding	0	0
Common stock - par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock - shares authorized	1,000,000,000	1,000,000,000
Common stock - issued	384,800,000	416,200,000
Common stock - outstanding	384,800,000	416,200,000

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 435.9	$ 435.3
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	161.3	185.4
Depreciation, amortization, and accretion	131.5	141.9
Restructuring and other (benefits) charges	(4)	179.4
Deferred income taxes	10	(85.4)
Gain on investments, net	(6.8)	(165.1)
Gain on legal settlement, net	0	(121.1)
Excess tax benefits from share-based compensation	(7.4)	(8.8)
Loss on disposal of fixed assets	0.4	1.9
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	(15.7)	(33.2)
Prepaid expenses and other assets	8.8	(19.9)
Accounts payable	(21.8)	49.9
Accrued compensation	(29)	(78.3)
Income taxes payable	108.2	86.1
Other accrued liabilities	(45)	(130.5)
Deferred revenue	49.1	40.9
Net cash provided by operating activities	775.5	478.5
Cash flows from investing activities:
Purchases of property and equipment	(154.9)	(141)
Purchases of available-for-sale investments	(1,147.6)	(1,970.5)
Proceeds from sales of available-for-sale investments	625.9	1,918.7
Proceeds from maturities of available-for-sale investments	197.4	339
Purchases of trading investments	(3.8)	(3.5)
Proceeds from sales of privately-held investments	10.3	2.5
Purchases of privately-held investments	(5.4)	(12.3)
Payments for business acquisitions, net of cash and cash equivalents acquired	(3.5)	(27.1)
Changes in restricted cash	11.6	45
Net cash (used in) provided by investing activities	(470)	150.8
Cash flows from financing activities:
Proceeds from issuance of common stock	97	157.6
Purchases and retirement of common stock	(1,057.6)	(1,761)
Issuance of long-term debt, net	594.6	346.5
Payment for capital lease obligation	0.4	(0.4)
Customer financing arrangements	0	0.8
Excess tax benefits from share-based compensation	7.4	8.8
Payment of cash dividends	(118)	(43.8)
Net cash used in financing activities	(476.2)	(1,291.5)
Effect of foreign currency exchange rates on cash and cash equivalents	(15.4)	(5.9)
Net decrease in cash and cash equivalents	(186.1)	(668.1)
Cash and cash equivalents at beginning of period	1,639.6	2,284
Cash and cash equivalents at end of period	$ 1,453.5	$ 1,615.9

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Basis of Presentation The unaudited Condensed Consolidated Financial Statements of Juniper Networks, Inc. (the “Company” or “Juniper”) have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. The Condensed Consolidated Balance Sheet as of September 30, 2015 , is derived from the audited Consolidated Financial Statements for the year ended December 31, 2014 . In the opinion of management, all adjustments, including normal recurring accruals, considered necessary for a fair presentation have been included. The results of operations for the three and nine months ended September 30, 2015 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2015 , or any future period. The information included in this Quarterly Report on Form 10-Q (“Report”) should be read in conjunction with “Management's Discussion and Analysis of Financial Condition and Results of Operations,” “Risk Factors,” “Quantitative and Qualitative Disclosures About Market Risk,” and the Consolidated Financial Statements and footnotes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 . Certain amounts in the prior year Financial Statements contained in this Report have been reclassified to conform to the current year presentation. The preparation of the financial statements and related disclosures in accordance with U.S. GAAP requires the Company to make judgments, assumptions, and estimates that affect the amounts reported in the Condensed Consolidated Financial Statements and the accompanying notes. Actual results could differ materially from those estimates under different assumptions or conditions.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies There have been no material changes to the Company's significant accounting policies compared to the accounting policies described in Note 2, Significant Accounting Policies , in Notes to Consolidated Financial Statements in Item 8 of Part II of the Annual Report on Form 10-K for the year ended December 31, 2014 . Recent Accounting Pronouncements In September 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-16 (Topic 805) - Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments , which replaces the requirement that an acquirer in a business combination account for measurement period adjustments retrospectively, with a requirement that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. ASU 2015-16 requires the entity to record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The amendment requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The amendment should be applied prospectively to adjustments to provisional amounts that occur after the effective date of the guidance, with early adoption permitted for financial statements that have not been issued. The adoption of this standard is not expected to have a significant impact on the Company's Condensed Consolidated Financial Statements. In July 2015, the FASB issued ASU No. 2015-11 (Subtopic 330) - Simplifying the Measurement of Inventory, which provides guidance to companies who account for inventory using either the first-in, first-out ("FIFO") or average cost methods. The guidance states that companies should measure inventory at the lower of cost and net realizable value. Net realizable value is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. ASU 2015-11 is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In June 2015, the FASB issued ASU No. 2015-10 - Technical Corrections and Improvements, which contains minor guidance clarifications and reference corrections, simplification of the Codification, and minor improvements on a wide variety of topics. ASU 2015-10 is effective for fiscal years beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In April 2015, the FASB issued ASU No. 2015-05 (Subtopic 350-40) - Customer's Accounting for Fees Paid in a Cloud Computing Arrangement , which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In April 2015, the FASB issued ASU No. 2015-03 (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs , which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard would reduce the debt issuance cost asset on the Company's Condensed Consolidated Balance Sheet by approximately $11.0 million and correspondingly reduce its debt liabilities by approximately $11.0 million . The Company plans to adopt this standard in the first quarter of 2016. The adoption of this standard will not have an impact to the Condensed Consolidated Statement of Operations. In August 2015, the FASB issued ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU 2015-15 provides additional guidance to ASU 2015-03, which did not address presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. The amendment states that an entity may defer and present debt issuance costs associated with line-of-credit arrangements as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The adoption of ASU 2015-15 is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In January 2015, the FASB issued ASU No. 2015-01 (Subtopic 225-20) - Income Statement - Extraordinary and Unusual Items , which eliminates the concept of extraordinary items. ASU 2015-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard will not have an impact on the Company's Condensed Consolidated Financial Statements. In November 2014, the FASB issued ASU No. 2014-16 (Topic 815) - Derivatives and Hedging , which provides clarification on how current guidance should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. Specifically, the amendments clarify that an entity should consider all relevant terms and features in evaluating the host contract and that no single term or feature would necessarily determine the economic characteristics and risks of the host contract. ASU 2014-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendment should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the year for which the amendments are effective. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's Condensed Consolidated Financial Statements. In August 2014, the FASB issued ASU No. 2014-15 (Subtopic 205-40) - Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (“ASU 2014-15”) which provides guidance about management's responsibility to evaluate whether or not there is substantial doubt about the Company's ability to continue as a going concern and to provide related footnote disclosure. ASU 2014-15 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early application is permitted. The adoption of this standard is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In June 2014, the FASB issued ASU No. 2014-12 (Topic 718) - Compensation - Stock Compensation (“ASU 2014-12”) which provides guidance that a performance target that affects vesting of a share-based payment and that could be achieved after the requisite service period is a performance condition. As a result, the target is not reflected in the estimation of the award’s grant date fair value. Compensation cost for such an award would be recognized over the required service period, if it is probable that the performance condition will be achieved. ASU 2014-12 is effective for all entities for annual periods beginning after December 15, 2015 and interim periods within those annual periods. ASU 2014-12 should be applied on a prospective basis to awards that are granted or modified on or after the effective date. The adoption of this standard is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09 (Topic 606) —Revenue from Contracts with Customers (“ASU 2014-09”) which provides guidance for revenue recognition. This ASU affects all contracts that the Company enters into with customers to transfer goods and services or for the transfer of nonfinancial assets. This ASU will supersede the revenue recognition requirements in Topic 605, and most industry specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts. The standard's core principle is that revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. In doing so, the Company will need to use additional judgment and estimates than under the existing guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of the new revenue standard from December 15, 2016 to December 15, 2017, with early adoption permitted as of annual reporting periods beginning after December 15, 2016. As a result, the Company will apply the new revenue standard for annual and interim periods beginning after December 15, 2017. Accordingly, the ASU will be effective for the Company beginning fiscal year 2018. The Company is currently evaluating the impact of the adoption of this standard on its Condensed Consolidated Financial Statements.

Cash Equivalents and Investment

Cash Equivalents and Investments	9 Months Ended
	Sep. 30, 2015
Cash Equivalents and Investments [Abstract]
Cash Equivalents and Investments	Cash Equivalents and Investments Investments in Available-for-Sale and Trading Securities The following tables summarize the Company's unrealized gains and losses and fair value of investments designated as available-for-sale and trading securities as of September 30, 2015 and December 31, 2014 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of September 30, 2015 Fixed income securities: Asset-backed securities $ 324.2 $ 0.1 $ (0.2 ) $ 324.1 Certificates of deposit 3.8 — — 3.8 Commercial paper 9.4 — — 9.4 Corporate debt securities 935.8 0.7 (1.9 ) 934.6 Foreign government debt securities 16.5 — — 16.5 Government-sponsored enterprise obligations 214.1 0.1 — 214.2 U.S. government securities 265.3 0.2 (0.1 ) 265.4 Total fixed income securities 1,769.1 1.1 (2.2 ) 1,768.0 Money market funds 196.0 — — 196.0 Mutual funds 3.7 0.1 — 3.8 Publicly-traded equity securities 8.0 0.7 — 8.7 Total available-for-sale securities 1,976.8 1.9 (2.2 ) 1,976.5 Trading securities in mutual funds (1) 16.8 — — 16.8 Total $ 1,993.6 $ 1.9 $ (2.2 ) $ 1,993.3 Reported as: Cash equivalents $ 166.3 $ — $ — $ 166.3 Restricted investments 33.4 0.1 — 33.5 Short-term investments 529.1 0.9 (0.1 ) 529.9 Long-term investments 1,264.8 0.9 (2.1 ) 1,263.6 Total $ 1,993.6 $ 1.9 $ (2.2 ) $ 1,993.3 ________________________________ (1) Balance consists of the Company's non-qualified deferred compensation plan assets. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of December 31, 2014 Fixed income securities: Asset-backed securities $ 269.3 $ — $ (0.3 ) $ 269.0 Certificates of deposit 10.6 — — 10.6 Commercial paper 20.3 — — 20.3 Corporate debt securities 738.6 0.5 (1.1 ) 738.0 Foreign government debt securities 24.6 — — 24.6 Government-sponsored enterprise obligations 162.2 — (0.1 ) 162.1 U.S. government securities 246.1 — (0.1 ) 246.0 Total fixed income securities 1,471.7 0.5 (1.6 ) 1,470.6 Money market funds 594.2 — — 594.2 Mutual funds 3.9 0.1 — 4.0 Publicly-traded equity securities 2.1 — (0.1 ) 2.0 Total available-for-sale securities 2,071.9 0.6 (1.7 ) 2,070.8 Trading securities in mutual funds (1) 16.3 — — 16.3 Total $ 2,088.2 $ 0.6 $ (1.7 ) $ 2,087.1 Reported as: Cash equivalents $ 576.6 $ — $ — $ 576.6 Restricted investments 45.2 — — 45.2 Short-term investments 332.2 0.2 (0.2 ) 332.2 Long-term investments 1,134.2 0.4 (1.5 ) 1,133.1 Total $ 2,088.2 $ 0.6 $ (1.7 ) $ 2,087.1 ________________________________ (1) Balance consists of the Company's non-qualified deferred compensation plan assets. The following table presents the contractual maturities of the Company's total fixed income securities as of September 30, 2015 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Due in less than one year $ 504.2 $ 0.3 $ (0.1 ) $ 504.4 Due between one and five years 1,264.9 0.8 (2.1 ) 1,263.6 Total $ 1,769.1 $ 1.1 $ (2.2 ) $ 1,768.0 The Company had 440 and 437 investments in unrealized loss positions as of September 30, 2015 and December 31, 2014 , respectively. The gross unrealized losses related to these investments were primarily due to changes in market interest rates and stock prices. The Company periodically reviews its investments to identify and evaluate investments that have an indication of possible impairment. The Company aggregates its investments by category and length of time the securities have been in a continuous unrealized loss position to facilitate its evaluation. For available-for-sale debt securities that have unrealized losses, the Company evaluates whether (i) it has the intention to sell any of these investments and (ii) whether it is more likely than not that it will be required to sell any of these investments before recovery of the entire amortized cost basis. As of September 30, 2015 , the Company anticipates that it will recover the entire amortized cost basis of such available-for-sale debt securities and has determined that no other-than-temporary impairments associated with credit losses were required to be recognized during the three and nine months ended September 30, 2015 and September 30, 2014 . For available-for-sale equity securities that have unrealized losses, the Company evaluates whether there is an indication of other-than-temporary impairments. This determination is based on several factors, including the financial condition and near-term prospects of the issuer and the Company's intent and ability to hold the publicly-traded equity securities for a period of time sufficient to allow for any anticipated recovery in market value. During the three and nine months ended September 30, 2015 , the Company did not recognize other-than-temporary impairments associated with these investments. During the three and nine months ended September 30, 2014 , the Company determined that certain available-for-sale equity securities were other-than-temporarily impaired, resulting in an impairment charge of $1.1 million and $2.7 million , respectively, which were recorded within other (expense) income, net, in the Condensed Consolidated Statements of Operations. During the three and nine months ended September 30, 2015 , there were no material gross realized gains or losses from available-for-sale securities and there were no material gross realized gains or losses from trading securities. During the nine months ended September 30, 2014 , gross realized gains from available-for-sale securities were $166.3 million and gross realized losses were not material, excluding the impairment charge noted above. During the three months ended September 30, 2014 , there were no material gross realized gains or losses from available-for-sale securities and during the three and nine months ended September 30, 2014 , there were no material gross realized gains or losses from trading securities. The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of September 30, 2015 and December 31, 2014 (in millions): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of September 30, 2015 Fixed income securities: Asset-backed securities (1) $ 188.5 $ (0.2 ) $ 34.2 $ — $ 222.7 $ (0.2 ) Corporate debt securities 522.0 (1.8 ) 17.5 (0.1 ) 539.5 (1.9 ) Foreign government debt securities (1)(2) 13.5 — — — 13.5 — Government-sponsored enterprise obligations (1)(2) 41.8 — — — 41.8 — U.S. government securities (1) 119.5 (0.1 ) — — 119.5 (0.1 ) Total fixed income securities 885.3 (2.1 ) 51.7 (0.1 ) 937.0 (2.2 ) Total available-for-sale securities $ 885.3 $ (2.1 ) $ 51.7 $ (0.1 ) $ 937.0 $ (2.2 ) ________________________________ (1) Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of September 30, 2015 . (2) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of September 30, 2015 . Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2014 Fixed income securities: Asset-backed securities $ 221.9 $ (0.3 ) $ — $ — $ 221.9 $ (0.3 ) Corporate debt securities 515.9 (1.1 ) — — 515.9 (1.1 ) Foreign government debt securities (1) 24.6 — — — 24.6 — Government-sponsored enterprise obligations 113.8 (0.1 ) — — 113.8 (0.1 ) U.S. government securities 189.0 (0.1 ) — — 189.0 (0.1 ) Total fixed income securities 1,065.2 (1.6 ) — — 1,065.2 (1.6 ) Publicly-traded equity securities 2.0 (0.1 ) — — 2.0 (0.1 ) Total available-for-sale securities $ 1,067.2 $ (1.7 ) $ — $ — $ 1,067.2 $ (1.7 ) ________________________________ (1) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2014 . Restricted Cash and Investments The Company classifies certain cash and investments as restricted cash and investments on its Condensed Consolidated Balance Sheets for: (i) amounts held in escrow accounts, as required in connection with certain acquisitions completed between 2005 and 2014; (ii) the India Gratuity Trust and Israel Retirement Trust, which cover statutory severance obligations in the event of termination of any of the Company's India and Israel employees, respectively; and (iii) the Directors and Officers indemnification trust (“D&O Trust”). The restricted investments are designated as available-for-sale securities. Privately-Held Investments The Company has privately-held investments, which include debt and redeemable preferred stock securities that are carried at fair value, and non-redeemable preferred stock securities that are carried at cost. As of September 30, 2015 and December 31, 2014 , the carrying values of the Company's privately-held investments of $91.3 million and $89.9 million , respectively, were included in other long-term assets in the Condensed Consolidated Balance Sheets. As of September 30, 2015 and December 31, 2014 , the carrying value of the privately-held investments includes debt and redeemable preferred stock securities of $48.9 million and $47.5 million , respectively. For the three and nine months ended September 30, 2015 , there were no unrealized gains or losses associated with the privately-held debt and redeemable preferred stock securities. For the nine months ended September 30, 2014 , the Company recorded $10.0 million in other comprehensive income for unrealized gains associated with its privately-held debt securities. During the three months ended September 30, 2014 , there were no unrealized gains or losses associated with its privately-held debt securities and redeemable preferred stock securities. The Company reviews its investments to identify and evaluate investments that have an indication of possible impairment. During the three and nine months ended September 30, 2015 , the Company determined that no privately-held investments were other-than-temporarily impaired. During the three and nine months ended September 30, 2014 , the Company determined that certain privately-held investments were other than temporarily impaired, resulting in impairment charges of $1.1 million that were recorded within other (expense) income, net in the Condensed Consolidated Statements of Operations.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables provide a summary of assets and liabilities measured at fair value on a recurring basis and as reported in the Condensed Consolidated Balance Sheets (in millions): Fair Value Measurements at September 30, 2015 Using: Quoted Prices in Active Markets For Identical Assets Significant Other Observable Remaining Inputs Significant Other Unobservable Remaining Inputs (Level 1) (Level 2) (Level 3) Total Assets measured at fair value: Available-for-sale securities: Asset-backed securities $ — $ 324.1 $ — $ 324.1 Certificates of deposit — 3.8 — 3.8 Commercial paper — 9.4 — 9.4 Corporate debt securities — 934.6 — 934.6 Foreign government debt securities — 16.5 — 16.5 Government-sponsored enterprise obligations — 214.2 — 214.2 Money market funds (1) 196.0 — — 196.0 Mutual funds (2) 3.8 — — 3.8 Publicly-traded equity securities 8.7 — — 8.7 U.S. government securities 265.4 — — 265.4 Total available-for-sale securities 473.9 1,502.6 — 1,976.5 Trading securities in mutual funds (3) 16.8 — — 16.8 Privately-held debt and redeemable preferred stock securities — — 48.9 48.9 Derivative assets: Foreign exchange contracts — 0.6 — 0.6 Total assets measured at fair value $ 490.7 $ 1,503.2 $ 48.9 $ 2,042.8 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (1.3 ) $ — $ (1.3 ) Total liabilities measured at fair value $ — $ (1.3 ) $ — $ (1.3 ) Total assets measured at fair value, reported as: Cash equivalents $ 166.3 $ — $ — $ 166.3 Restricted investments 33.5 — — 33.5 Short-term investments 135.1 394.8 — 529.9 Long-term investments 155.8 1,107.8 — 1,263.6 Prepaid expenses and other current assets — 0.6 — 0.6 Other long-term assets — — 48.9 48.9 Total assets measured at fair value $ 490.7 $ 1,503.2 $ 48.9 $ 2,042.8 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (1.3 ) $ — $ (1.3 ) Total liabilities measured at fair value $ — $ (1.3 ) $ — $ (1.3 ) ________________________________ (1) Balance includes $29.7 million of restricted investments measured at fair market value related to the Company's D&O Trust and acquisition-related escrows. (2) Balance relates to restricted investments measured at fair market value related to the Company's India Gratuity Trust. (3) Balance relates to investments measured at fair value related to the Company's non-qualified deferred compensation plan assets. Fair Value Measurements at December 31, 2014 Using: Quoted Prices in Active Markets For Identical Assets Significant Other Observable Remaining Inputs Significant Other Unobservable Remaining Inputs (Level 1) (Level 2) (Level 3) Total Assets measured at fair value: Available-for-sale securities: Asset-backed securities $ — $ 269.0 $ — $ 269.0 Certificates of deposit — 10.6 — 10.6 Commercial paper — 20.3 — 20.3 Corporate debt securities — 738.0 — 738.0 Foreign government debt securities — 24.6 — 24.6 Government-sponsored enterprise obligations — 162.1 — 162.1 Money market funds (1) 594.2 — — 594.2 Mutual funds (2) 4.0 — — 4.0 Publicly-traded equity securities 2.0 — — 2.0 U.S. government securities 246.0 — — 246.0 Total available-for-sale securities 846.2 1,224.6 — 2,070.8 Trading securities in mutual funds (3) 16.3 — — 16.3 Privately-held debt and redeemable preferred stock securities — — 47.5 47.5 Derivative assets: Foreign exchange contracts — 0.1 — 0.1 Total assets measured at fair value $ 862.5 $ 1,224.7 $ 47.5 $ 2,134.7 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (3.9 ) $ — $ (3.9 ) Total liabilities measured at fair value $ — $ (3.9 ) $ — $ (3.9 ) Total assets measured at fair value, reported as: Cash equivalents $ 552.9 $ 23.7 $ — $ 576.6 Restricted investments 45.2 — — 45.2 Short-term investments 87.0 245.2 — 332.2 Long-term investments 177.4 955.7 — 1,133.1 Prepaid expenses and other current assets — 0.1 — 0.1 Other long-term assets — — 47.5 47.5 Total assets measured at fair value $ 862.5 $ 1,224.7 $ 47.5 $ 2,134.7 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (3.9 ) $ — $ (3.9 ) Total liabilities measured at fair value $ — $ (3.9 ) $ — $ (3.9 ) ________________________________ (1) Balance includes $41.3 million of restricted investments measured at fair market value related to the Company's D&O Trust and acquisition-related escrows. (2) Balance relates to restricted investments measured at fair market value related to the Company's India Gratuity Trust. (3) Balance relates to investments measured at fair value related to the Company's non-qualified deferred compensation plan assets. The Company's Level 2 available-for-sale fixed income securities are priced using quoted market prices for similar instruments or non-binding market prices that are corroborated by observable market data. The Company uses inputs such as actual trade data, benchmark yields, broker/dealer quotes, or alternative pricing sources with reasonable levels of price transparency which are obtained from quoted market prices, independent pricing vendors, or other sources, to determine the ultimate fair value of these assets. The Company's derivative instruments are classified as Level 2, as they are not actively traded and are valued using pricing models that use observable market inputs. The Company's policy is to recognize asset or liability transfers among Level 1, Level 2, and Level 3 at the beginning of the quarter in which a change in circumstances resulted in a transfer. During the three and nine months ended September 30, 2015 , the Company had no transfers between levels of the fair value hierarchy of its assets or liabilities measured at fair value. All of the Company's privately-held debt and redeemable preferred stock securities, are classified as Level 3 assets due to the absence of quoted market prices and an inherent lack of liquidity. The Company estimates the fair value of its privately-held debt investments on a recurring basis using an analysis of the financial condition and near-term prospects of the investee, including recent financing activities and the investee's capital structure. During the three and nine months ended September 30, 2015 , there were purchases related to privately-held debt securities of $2.2 million and $5.0 million , respectively. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Certain of the Company's assets, including intangible assets, goodwill, and privately-held equity investments, are measured at fair value on a nonrecurring basis, only if impairment is indicated. Privately-held equity investments, which are normally carried at cost, are measured at fair value on a nonrecurring basis due to events and circumstances that the Company identifies as significantly impacting the fair value of investments. The Company estimates the fair value of its privately-held equity investments using an analysis of the financial condition and near-term prospects of the investee, including recent financing activities and the investee's capital structure. Purchased intangible assets are measured at fair value primarily using discounted cash flow projections. As of September 30, 2015 , the Company had no assets measured at fair value on a nonrecurring basis. As of December 31, 2014 , the Company recorded a goodwill impairment charge of $850.0 million for its Security reporting unit measured at fair value on a nonrecurring basis. The remeasurement of goodwill is classified as a Level 3 value assessment due to the significance of unobservable inputs developed using company-specific information. As of December 31, 2014, the Company had no significant privately-held equity investments measured at fair value on a nonrecurring basis. As of September 30, 2015 and December 31, 2014 , the Company had no liabilities measured at fair value on a nonrecurring basis. Assets and Liabilities Not Measured at Fair Value The carrying amounts of the Company's accounts receivable, financing receivables, accounts payable, and other accrued liabilities approximate fair value due to their short maturities. As of September 30, 2015 and December 31, 2014 , the estimated fair value of the Company's short-term and long-term debt in the Condensed Consolidated Balance Sheets was approximately $1,976.0 million and $1,395.2 million , respectively, based on observable market inputs (Level 2). As of September 30, 2015 and December 31, 2014 , the carrying value of the promissory note of $125.0 million issued to the Company in connection with the sale of Junos Pulse recorded in other long-term assets in the Condensed Consolidated Balance Sheet approximates its fair value. The promissory note is classified as a Level 3 asset due to the absence of quoted market prices and inherent lack of liquidity.

Derivative Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The Company uses derivatives to partially offset its market exposure to fluctuations in certain foreign currencies and does not enter into derivatives for speculative or trading purposes. The notional amount of the Company's foreign currency derivatives are summarized as follows (in millions): As of September 30, December 31, Cash flow hedges $ 116.3 $ 160.7 Non-designated derivatives 55.9 78.0 Total $ 172.2 $ 238.7 Cash Flow Hedges The Company uses foreign currency forward or option contracts to hedge certain forecasted foreign currency transactions relating to cost of services and operating expenses. The derivatives are intended to hedge the U.S. Dollar equivalent of the Company's planned cost of services and operating expenses denominated in certain foreign currencies. These derivatives are designated as cash flow hedges. Execution of these cash flow hedge derivatives typically occurs every month with maturities of one year or less. The effective portion of the derivative's gain or loss is initially reported as a component of accumulated other comprehensive loss, and upon occurrence of the forecasted transaction, is subsequently reclassified into the cost of services or operating expense line item to which the hedged transaction relates. The Company records any ineffectiveness of the hedging instruments in other (expense) income, net, on its Condensed Consolidated Statements of Operations. Cash flows from such hedges are classified as operating activities. All amounts within other comprehensive income are expected to be reclassified into earnings within the next twelve months. See Note 4, Fair Value Measurements , for the fair values of the Company's derivative instruments in the Condensed Consolidated Balance Sheets. During the three and nine months ended September 30, 2015 , the Company recognized unrealized losses of $1.9 million and $5.2 million , respectively, in accumulated other comprehensive loss for the effective portion of its derivative instruments and reclassified a realized loss of $1.9 million and $8.7 million , respectively, from other comprehensive income to operating expense in the Condensed Consolidated Statements of Operations. During the three and nine months ended September 30, 2014 , the Company recognized an unrealized loss of $2.8 million and an unrealized gain of $1.7 million , respectively, in accumulated other comprehensive loss for the effective portion of its derivative instruments and reclassified a realized gain of $1.5 million and $5.0 million , respectively, during the three and nine months ended September 30, 2014 from other comprehensive income to operating expense in the Condensed Consolidated Statements of Operations. The ineffective portion of the Company's derivative instruments recognized in its Condensed Consolidated Statements of Operations was not material during the three and nine months ended September 30, 2015 and September 30, 2014 . Non-Designated Derivatives The Company also uses foreign currency forward contracts to mitigate variability in gains and losses generated from the remeasurement of certain monetary assets and liabilities denominated in foreign currencies. These derivatives are carried at fair value with changes recorded in other (expense) income, net, in the Condensed Consolidated Statements of Operations. Changes in the fair value of these derivatives are largely offset by remeasurement of the underlying assets and liabilities. Cash flows from such derivatives are classified as operating activities. These foreign exchange forward contracts have maturities within two months. During the three and nine months ended September 30, 2015 , the Company recognized a net loss of $0.1 million and $0.4 million , respectively, on non-designated derivative instruments within other (expense) income, net, in its Condensed Consolidated Statements of Operations. During the three and nine months ended September 30, 2014 , the Company recognized net losses of $0.3 million and $3.3 million , respectively, on non-designated derivative instruments within other (expense) income, net, in its Condensed Consolidated Statements of Operations. Offsetting of Derivatives The Company presents its derivative assets and derivative liabilities on a gross basis in the Condensed Consolidated Balance Sheets. However, under agreements containing provisions on netting with certain counterparties of foreign exchange contracts, subject to applicable requirements, the Company is allowed to net-settle transactions on the same date in the same currency, with a single net amount payable by one party to the other. As of September 30, 2015 and December 31, 2014 , the potential effect of rights of setoff associated with derivative instruments was not material. The Company is neither required to pledge nor entitled to receive cash collateral related to these derivative transactions.

Goodwill and Purchased Intangib

Goodwill and Purchased Intangible Assets	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	Goodwill and Purchased Intangible Assets Goodwill The following table presents goodwill activity during the nine months ended September 30, 2015 (in millions): Balance as of December 31, 2014 $ 2,981.5 Other (0.2 ) Balance as of September 30, 2015 $ 2,981.3 There were no impairments to goodwill during the three and nine months ended September 30, 2015 and September 30, 2014 . Purchased Intangible Assets The Company’s purchased intangible assets were as follows (in millions): Gross Accumulated Amortization Accumulated Impairments and Other Charges Net As of September 30, 2015 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (487.2 ) $ (49.9 ) $ 30.6 Customer contracts, support agreements, and related relationships 78.1 (67.2 ) (2.8 ) 8.1 Other 1.1 (0.6 ) — 0.5 Total purchased intangible assets $ 646.9 $ (555.0 ) $ (52.7 ) $ 39.2 As of December 31, 2014 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (466.1 ) $ (49.9 ) $ 51.7 Customer contracts, support agreements, and related relationships 78.1 (65.2 ) (2.8 ) 10.1 Other 1.1 (0.5 ) — 0.6 Total purchased intangible assets $ 646.9 $ (531.8 ) $ (52.7 ) $ 62.4 The following table presents the amortization of intangible assets included in the Condensed Consolidated Statements of Operations (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost of revenues $ 4.7 $ 7.1 $ 20.2 $ 23.7 Operating expenses: Sales and marketing 0.7 1.1 2.1 3.2 General and administrative 0.2 0.3 0.9 0.9 Total operating expenses 0.9 1.4 3.0 4.1 Total $ 5.6 $ 8.5 $ 23.2 $ 27.8 During the nine months ended September 30, 2015 , the Company recorded $5.6 million to cost of revenues in the Condensed Consolidated Statements of Operations, related to the acceleration of the end-of-life of certain intangible assets. There were no such charges during the three months ended September 30, 2015 and three and nine months ended September 30, 2014 . There were no impairment charges related to purchased intangible assets during the three and nine months ended September 30, 2015 and September 30, 2014 . As of September 30, 2015 , the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions): Years Ending December 31, Amount Remainder of 2015 $ 5.3 2016 11.6 2017 7.0 2018 5.1 2019 4.9 Thereafter 5.3 Total $ 39.2

Other Financial Information

Other Financial Information	9 Months Ended
	Sep. 30, 2015
Other Financial Information [Abstract]
Other Financial Information	Other Financial Information Inventories The Company purchases and holds inventory to help ensure adequate component supplies over the life of the underlying products. The majority of the Company's inventory is production components to be used in the manufacturing process and finished goods inventory in transit. Inventories are reported both within prepaid expenses and other current assets and other long-term assets in the Condensed Consolidated Balance Sheets. Total inventories consisted of the following (in millions): As of September 30, December 31, Production materials $ 45.2 $ 38.3 Finished goods 27.1 24.2 Inventories $ 72.3 $ 62.5 In connection with the 2014 Restructuring Plan discussed in Note 8, Restructuring and Other Charges , the Company accelerated the end-of-service life of certain products resulting in inventory charges of $15.5 million , recorded within cost of revenues in the Condensed Consolidated Statement of Operations for the nine months ended September 30, 2014 . There were no similar charges recorded for the three months ended September 30, 2014 and the three and nine months ended September 30, 2015. Other Long-Term Assets Other long-term assets consisted of the following (in millions): As of September 30, December 31, Privately-held investments $ 91.3 $ 89.9 Licensed software 7.7 8.6 Federal income tax receivable 28.9 20.0 Customer financing receivable 1.5 16.9 Inventory 8.7 8.0 Prepaid costs, deposits, and other 60.5 35.5 Promissory note in connection with the sale of Junos Pulse 125.0 125.0 Interest receivable in connection with Promissory note 6.3 — Other long-term assets $ 329.9 $ 303.9 On October 1, 2014, the Company completed the sale of its Junos Pulse product portfolio. The Company received total consideration of $230.7 million , of which $105.7 million was in cash, net of a $19.3 million working capital adjustment, and $125.0 million was in the form of a non-contingent interest-bearing promissory note due to the Company on April 1, 2016 (the “Pulse Note”). As of September 30, 2015 , the Company did not receive scheduled interest payments of $3.1 million on the Pulse Note and expected further delayed payments beyond the original term of the agreement. On October 2, 2015, the Company and the issuer of the Pulse Note mutually agreed to amend the original terms of the Pulse Note. Under the terms of the modified Pulse Note, the parties agreed to extend the maturity date from April 1, 2016 to December 31, 2018, provide that interest due on the Pulse Note through December 31, 2015 shall be paid in kind by increasing the outstanding principal amount of the note, increase the interest payable on the Pulse Note, and include semi-annual excess cash flow sweeps commencing in 2016. The issuer of the Pulse Note is also required to make a minimum payment of $75.0 million on or prior to April 1, 2017, less any amount previously pre-paid to the Company, and use commercially reasonable efforts to refinance the entire note, with any remaining balance due by December 31, 2018. Certain holding companies of the issue also provided the Company with collateral and guarantees. See Note 16, Subsequent Events, for further details on the modified terms. The note receivable, along with the related interest receivable, are classified as long-term assets based on expected collection beyond twelve months from the Condensed Consolidated Balance Sheet date. The Company measures any impairment to the Pulse Note based on the present value of expected cash flows, which are discounted at the note’s effective interest rate, compared to the recorded investment of the note, including principal and accrued interest. Based on this calculation, no impairment charge was required to the Pulse Note as of September 30, 2015 . Interest income on the Pulse Note is accrued and credited to interest income as it is earned, unless it is not probable the Company will collect the amounts due or if the present value of expected future cash flow is less than the recorded investment. During the three and nine months ended September 30, 2015 , the related amount of interest income recognized was $1.6 million and $4.7 million , respectively. Warranties The Company accrues for warranty costs based on associated material, labor for customer support, and overhead at the time revenue is recognized. This accrual is reported within other accrued liabilities in the Condensed Consolidated Balance Sheets. Changes in the Company’s warranty reserve during the nine months ended September 30, 2015 were as follows (in millions): Balance as of December 31, 2014 $ 28.7 Provisions made during the period 20.8 Actual costs incurred during the period (21.2 ) Balance as of September 30, 2015 $ 28.3 Deferred Revenue Details of the Company's deferred revenue, as reported in the Condensed Consolidated Balance Sheets, were as follows (in millions): As of September 30, December 31, Deferred product revenue: Undelivered product commitments and other product deferrals $ 221.7 $ 180.3 Distributor inventory and other sell-through items 63.1 103.7 Deferred gross product revenue 284.8 284.0 Deferred cost of product revenue (43.7 ) (58.4 ) Deferred product revenue, net 241.1 225.6 Deferred service revenue 883.8 850.1 Total $ 1,124.9 $ 1,075.7 Reported as: Current $ 814.4 $ 780.8 Long-term 310.5 294.9 Total $ 1,124.9 $ 1,075.7 Deferred product revenue represents unrecognized revenue related to shipments to distributors that have not sold through to end-users, undelivered product commitments, and other shipments that have not met all revenue recognition criteria. In circumstances when costs are deferred, deferred product revenue is recorded net of the related costs of product revenue. Deferred service revenue represents billable amounts for service contracts, which include technical support, hardware and software maintenance, professional services, and training, for which services have not been rendered. Other (Expense) Income, Net Other (expense) income, net, consisted of the following (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Interest income $ 5.7 $ 2.7 $ 16.3 $ 6.9 Interest expense (21.6 ) (16.9 ) (61.9 ) (50.2 ) Net gain on legal settlement — 0.8 — 196.1 Gain (loss) on investments 6.0 (1.9 ) 6.8 165.1 Other 1.5 8.5 (2.5 ) 8.1 Other (expense) income, net $ (8.4 ) $ (6.8 ) $ (41.3 ) $ 326.0 Interest income primarily includes interest earned on the Company’s cash, cash equivalents, investments, and on the promissory note issued to the Company in connection with the sale of Junos Pulse. Interest expense primarily includes interest, net of capitalized interest expense, from short-term debt, long-term debt, and customer financing arrangements. Other typically consists of investment and foreign exchange gains and losses and other non-operational income and expense items. During the nine months ended September 30, 2014, the Company entered into a settlement agreement with Palo Alto Networks, Inc. (“PAN”) resolving patent litigation between the two companies, which resulted in a realized gain on legal settlement of $196.1 million , net of legal fees. Under the terms of the settlement, PAN made a one-time payment to the Company of $75.0 million in cash and issued the Company PAN common stock and warrants. The fair value of the PAN common stock and warrants at the date of receipt was included in net realized gain. All such PAN securities were sold in the third quarter of 2014, and the Company recorded an additional $0.8 million gain during the three months ended September 30, 2014 . During the three and nine months ended September 30, 2015, the Company recorded a gain of $6.0 million primarily related to the sale of its privately-held investments. During the nine months ended September 30, 2014, the Company recorded a gain of $163.0 million primarily related to the sale of investments which were converted from privately-held investments to publicly-traded equity upon initial public offering and subsequently sold.

Restructuring and Other Charges

Restructuring and Other Charges	9 Months Ended
	Sep. 30, 2015
Restructuring Charges [Abstract]
Restructuring and Other Charges	Restructuring and Other Charges 2014 Restructuring Plan and Other Restructuring Plans In the first quarter of 2014, the Company initiated a restructuring plan (the “2014 Restructuring Plan”) designed to refocus the Company's strategy, optimize its structure, and improve operational efficiencies. The 2014 Restructuring Plan consisted of workforce reductions, facility consolidations and closures, asset write-downs, contract terminations and other charges. The Company had also initiated restructuring plans in each of the fiscal years from 2011 through 2013 (the “Other Restructuring Plans”) which focused on improving the Company's cost structure through product portfolio rationalizations, workforce reductions, contract terminations, project cancellations, and facility closures and consolidations. As of December 31, 2014, the Company's restructuring plans have been substantially completed and the Company does not expect to record significant future charges under any of these restructuring plans. The following table presents restructuring and other charges and (benefits) included in cost of revenues and restructuring and other (benefits) charges in the Condensed Consolidated Statements of Operations under the Company's restructuring plans (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Severance $ — $ 7.1 $ 0.4 $ 45.6 Facilities — (25.0 ) (0.9 ) 12.8 Contract terminations — — — 2.3 Asset impairment and write-downs (3.5 ) 2.9 (3.5 ) 118.7 Total $ (3.5 ) $ (15.0 ) $ (4.0 ) $ 179.4 Reported as: Cost of revenues $ (3.5 ) $ — $ (3.5 ) $ 22.2 Restructuring and other (benefits) charges — (15.0 ) (0.5 ) 157.2 Total $ (3.5 ) $ (15.0 ) $ (4.0 ) $ 179.4 During the three months ended September 30, 2015 , the Company recorded a benefit of $3.5 million for a previously recorded charge related to products with contract manufacturers for acceleration of the end-of-service life of certain products to cost of revenues in the Condensed Consolidated Statements of Operations. During the nine months ended September 30, 2015 , the Company recorded $0.4 million of severance costs and a benefit of $0.9 million for facilities that were recorded in restructuring and other (benefits) charges in the Condensed Consolidated Statements of Operations, in connection with the 2014 Restructuring Plan. During the three months ended September 30, 2014 , the Company recorded $7.1 million of severance costs, a benefit of $25.0 million for facility consolidation and closures, and $2.9 million of asset write-downs, that were recorded to restructuring and other (benefits) charges in the Condensed Consolidated Statement of Operations. In connection with the facility consolidation and closures charge, the Company with the consent of its landlord and the administrative agent to its lienholder, assigned certain of its real property leases, totaling approximately 0.4 million square feet, to a third party. Concurrently with the assignments, the Company executed a sublease with the assignee for one of the properties of approximately 0.1 million square feet, for a period of two years , with a one -time right to extend the term for up to six months . Under these arrangements, the Company paid $12.3 million to the landlord and was released from all future lease obligations following the date of the assignments. The Company also incurred $5.3 million of transaction fees, which were recorded to restructuring and other (benefits) charges in the Condensed Consolidated Statements of Operations. As a result of the lease assignments, the Company recorded a benefit of approximately $25.0 million , which included a reversal of previously recorded restructuring liability and additional charges relating to facility consolidation activities, in the third quarter of 2014. During the nine months ended September 30, 2014 , the Company recorded $45.0 million of severance costs, $12.6 million of facility consolidation and closures, $84.7 million of impairment charges related to licensed software, $11.8 million of asset write-downs, and $2.3 million of charges related to contract terminations, which were recorded in restructuring and other (benefits) charges in the Condensed Consolidated Statements of Operations, in connection with the 2014 Restructuring Plan. The Company also recorded inventory write-downs of $15.5 million and a charge related to products with contract manufacturers of $6.7 million for acceleration of the end-of-service life of certain products to cost of revenues in the Condensed Consolidated Statement of Operations during the nine months ended September 30, 2014 , in connection with the 2014 Restructuring Plan. The remaining $0.8 million of charges were incurred for the Other Restructuring Plans during the nine months ended September 30, 2014. Restructuring and other (benefits) charges noted above are based on the 2014 Restructuring Plan and Other Restructuring Plans that were committed to by management. Any changes in the estimates of executing the approved restructuring plans are reflected in the Company's results of operations. Restructuring Liability Restructuring liabilities are reported within other accrued liabilities and other long-term liabilities in the Condensed Consolidated Balance Sheets. The following table provides a summary of changes in the restructuring liability related to the Company's plans during the nine months ended September 30, 2015 (in millions): December 31, Charges Cash Payments Non-cash Settlements and Other September 30, Severance $ 9.4 $ 0.4 $ (8.0 ) $ (1.8 ) $ — Facilities 7.4 (0.9 ) (2.3 ) (0.7 ) 3.5 Contract terminations and other 0.2 (3.5 ) — 3.3 — Total $ 17.0 $ (4.0 ) $ (10.3 ) $ 0.8 $ 3.5 As of September 30, 2015 , the Company's restructuring liability was $3.5 million related to facility closures which are expected to be paid through March 2018.

Debt and Financing

Debt and Financing	9 Months Ended
	Sep. 30, 2015
Debt Instruments [Abstract]
Debt and Financing	Debt and Financing Debt The following table summarizes the Company's short-term and long-term debt (in millions, except percentages): As of September 30, 2015 Amount Effective Interest Rates Senior Notes: 3.10% fixed-rate notes, due March 2016 $ 300.0 3.25 % 3.30% fixed-rate notes, due June 2020 300.0 3.47 % 4.60% fixed-rate notes, due March 2021 300.0 4.69 % 4.50% fixed-rate notes, due March 2024 350.0 4.63 % 4.35% fixed-rate notes, due June 2025 300.0 4.47 % 5.95% fixed-rate notes, due March 2041 400.0 6.03 % Total senior notes 1,950.0 Unaccreted discount (1.4 ) Total $ 1,948.6 Reported as: Short-term debt $ 299.9 Long-term debt 1,648.7 Total $ 1,948.6 In March 2015, the Company issued $300.0 million aggregate principal amount of 3.30% senior notes due 2020 ("2020 Notes") and $300.0 million aggregate principal amount of 4.35% senior notes due 2025 ("2025 Notes"). In March 2014, the Company issued $350.0 million aggregate principal amount of 4.50% senior notes due 2024 ("2024 Notes"). In March 2011, the Company issued $300.0 million aggregate principal amount of 3.10% senior notes due 2016 ("2016 Notes"), $300.0 million aggregate principal amount of 4.60% senior notes due 2021 ("2021 Notes"), and $400.0 million aggregate principal amount of 5.95% senior notes due 2041 ("2041 Notes"). The "2016 Notes," "2020 Notes," "2021 Notes," "2024 Notes," "2025 Notes" and "2041 Notes" collectively the "Notes" are the Company’s senior unsecured and unsubordinated obligations, ranking equally in right of payment to all of the Company’s existing and future senior unsecured and unsubordinated indebtedness and senior in right of payment to any of the Company’s future indebtedness that is expressly subordinated to the Notes. The Company may redeem the 2020 Notes and 2025 Notes, either in whole or in part, at any time one month prior to the maturity date of the 2020 Notes, and three months prior to the maturity date of the 2025 Notes, at a redemption price equal to the greater of (i) 100% of the aggregate principal amount of the 2020 Notes and 2025 Notes to be redeemed or (ii) the sum of the present values of the remaining scheduled payments discounted at the Treasury rate plus 30 basis points for the 2020 Notes, or the Treasury rate plus 37.5 basis points for the 2025 Notes, plus, in the case of each of the clauses (i) and (ii) above, accrued and unpaid interest, if any. At any time on or after May 15, 2020, in the case of the 2020 Notes, and at any time on or after March 15, 2025, in the case of the 2025 Notes, the Company may redeem Notes of such series, in whole or in part, at a redemption price equal to 100% of the principal amount of the 2020 Notes and the 2025 Notes to be redeemed, plus accrued and unpaid interest, if any. The Company may redeem the other Notes, either in whole or in part, at any time at a redemption price equal to the greater of (i) 100% of the aggregate principal amount of the Notes to be redeemed or (ii) the sum of the present values of the remaining scheduled payments discounted to the redemption date, plus, in either case, accrued and unpaid interest, if any. In the event of a change of control repurchase event, the holders of the Notes may require the Company to repurchase for cash all or part of the Notes at a purchase price equal to 101% of the aggregate principal amount, plus accrued and unpaid interest, if any. Interest on the Notes is payable in cash semiannually. The effective interest rates for the Notes include the interest on the Notes, accretion of the discount, and amortization of issuance costs. The indentures that govern the Notes also contain various covenants, including limitations on the Company's ability to incur liens or enter into sale-leaseback transactions over certain dollar thresholds. As of September 30, 2015 , the Company was in compliance with all covenants in the indentures governing the Notes. Revolving Credit Facility On June 27, 2014, the Company entered into a Credit Agreement (“Credit Agreement”) with certain institutional lenders and Citibank, N.A., as administrative agent, that provides for a $500.0 million unsecured revolving credit facility, with an option of the Company to increase the amount of the credit facility by up to an additional $200.0 million , subject to certain conditions. Proceeds of loans made under the Credit Agreement may be used by the Company for working capital and general corporate purposes. Revolving loans may be borrowed, repaid and reborrowed until June 27, 2019, at which time all amounts borrowed must be repaid. Borrowings may be denominated, at the Company's option, in U.S. dollars, Pounds Sterling or Euro. Borrowings under the Credit Agreement will bear interest at either i) a floating rate per annum equal to the base rate plus a margin of between 0.00% and 0.50% , depending on the Company's public debt rating or ii) a per annum rate equal to the reserve adjusted Eurocurrency rate , plus a margin of between 0.90% and 1.50% , depending on the Company's public debt rating. Base rate is defined as the greatest of (A) Citibank's base rate , (B) the Federal funds rate plus 0.50% or (C) the ICE Benchmark Administration Settlement Rate applicable to dollars for a period of one month plus 1.00% . The Eurocurrency rate is determined for U.S. dollars and Pounds Sterling as the rate at which deposits in such currency are offered in the London interbank market for the applicable interest period and for Euro as the rate specified for deposits in Euro with a maturity comparable to the applicable interest period. As of September 30, 2015 , the Company was in compliance with all covenants in the Credit Agreement, and no amounts were outstanding. Customer Financing Arrangements The Company provides certain distribution partners access to extended financing arrangements for certain end-user customers that require longer payment terms than those typically provided by the Company through factoring accounts receivable to third-party financing providers (“financing providers”). The program does not and is not intended to affect the timing of the Company's revenue recognition. Under the financing arrangements, proceeds from the financing provider are due to the Company within 30 to 90 days from the sale of the receivable. In these transactions with the financing provider, the Company surrenders control over the transferred assets. The factored accounts receivable are isolated from the Company and put beyond the reach of the Company's creditors, even in the event of bankruptcy. The Company does not maintain effective control over the transferred assets through obligations or rights to redeem, transfer, or repurchase the receivables after they have been transferred. In 2014, the Company transitioned certain distribution partners from the third party financing program to the Company's commercial payment terms. As a result, the Company's customer financing activities significantly declined from fiscal year 2014 through the third quarter of 2015. Pursuant to the financing arrangements for the sale of receivables, the Company sold net receivables of $11.4 million and $92.8 million during the three months ended September 30, 2015 and September 30, 2014 , respectively, and $69.9 million and $429.2 million during the nine months ended September 30, 2015 and September 30, 2014 , respectively. The Company received cash proceeds from the financing provider of $9.1 million and $128.9 million during the three months ended September 30, 2015 and September 30, 2014 , respectively, and $94.6 million and $473.3 million during the nine months ended September 30, 2015 and September 30, 2014 , respectively. As of September 30, 2015 and December 31, 2014 , the amounts owed to the Company by the financing provider were $3.7 million and $28.0 million , respectively, and were recorded in accounts receivable on the Condensed Consolidated Balance Sheets. The Company has provided guarantees to third-party financing companies for certain third-party financing arrangements extended to certain end-user customers, which have terms of up to four years. The Company is liable for the aggregate unpaid payments to the third-party financing company in the event of customer default. As of September 30, 2015 , the Company has not been required to make any payments under these arrangements. Pursuant to these arrangements, the Company has guarantees for third-party financing arrangements of $11.2 million as of September 30, 2015 . The portion of the receivable financed that has not been recognized as revenue is accounted for as a financing arrangement and is included in other accrued liabilities and other long-term liabilities in the Condensed Consolidated Balance Sheets . As of September 30, 2015 and December 31, 2014 , the estimated cash received from the financing provider not recognized as revenue was $16.8 million and $67.5 million , respectively.

Equity

Equity	9 Months Ended
	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Equity	Equity Cash Dividends on Shares of Common Stock During the nine months ended September 30, 2015 , the Company declared a quarterly cash dividend of $0.10 per share of common stock on January 27, 2015, April 23, 2015, and on July 23, 2015 which were paid on March 24, 2015, June 23, 2015, and on September 22, 2015, respectively, to stockholders of record on March 3, 2015, June 2, 2015, and on September 1, 2015, respectively, in the aggregate amount of $118.0 million . Any future dividends, and the establishment of record and payment dates, are subject to approval by the Board of Directors (the “Board”) of Juniper or an authorized committee thereof. See Note 16, Subsequent Events, for discussion of the Company's dividend declaration subsequent to September 30, 2015 . Stock Repurchase Activities In February 2014, the Company's Board approved a stock repurchase program that authorized the Company to repurchase up to $2.1 billion of its common stock, including $1.2 billion pursuant to an accelerated share repurchase program (“2014 Stock Repurchase Program”). In October 2014 and July 2015, the Board authorized a $1.3 billion and $500.0 million increase, respectively, to the 2014 Stock Repurchase Program for a total of $3.9 billion . As of September 30, 2015 , there was $625.0 million of authorized funds remaining under the 2014 Stock Repurchase Program. During the three and nine months ended September 30, 2015 , the Company repurchased and retired approximately 1.8 million and 42.4 million shares of its common stock, respectively, at an average price of $28.01 and $24.78 per share, respectively, for an aggregate purchase price of $50.0 million and $1.1 billion , respectively. During the nine months ended September 30, 2014, the Company entered into two separate accelerated share repurchase agreements (collectively, the “ASR”) with two financial institutions to repurchase an aggregate of $1.2 billion of the Company's common stock. During the first quarter of 2014, the Company made an up-front payment of $1.2 billion pursuant to the ASR and received and retired an initial 33.3 million shares ("Initial Shares") of the Company's common stock for an aggregate price of $900.0 million based on the market value of the Company's common stock on the date of the transaction. On July 23, 2014, the ASR was completed and the Company received an additional 16.0 million shares from the financial institutions for the remaining $300.0 million for a total repurchase of 49.3 million shares of the Company's common stock, which resulted in a volume weighted average repurchase price, less an agreed upon discount, of $24.35 . The shares received with respect to the ASR have been retired. Retired shares return to authorized but unissued shares of common stock. Subsequent to the completion of the ASR, the Company repurchased and retired approximately 23.5 million shares of its common stock under the 2014 Stock Repurchase Program at an average price of $23.44 per share for an aggregate purchase price of $550.0 million during the three months ended September 30, 2014 . In addition to repurchases under the Company’s stock repurchase program, the Company also repurchases common stock from certain employees in connection with the net issuance of shares to satisfy minimum tax withholding obligations upon the vesting of certain stock awards issued to such employees. Repurchases associated with tax withholdings were not significant during the three and nine months ended September 30, 2015 and September 30, 2014 . Future stock repurchases under the Company’s stock repurchase program will be subject to a review of the circumstances at that time and will be made from time to time in private transactions or open market purchases as permitted by securities laws and other legal requirements. See Note 16, Subsequent Events, for discussion of the Company's stock repurchase activity subsequent to September 30, 2015 . Accumulated Other Comprehensive Loss, Net of Tax The components of accumulated other comprehensive loss, net of related taxes, during the nine months ended September 30, 2015 were as follows (in millions): Unrealized Gains (Losses) on Available-for- Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Foreign Currency Translation Adjustments Total Balance as of December 31, 2014 $ 8.4 $ (4.2 ) $ (18.0 ) $ (13.8 ) Other comprehensive gain (loss) before reclassifications 4.6 (5.4 ) (12.9 ) (13.7 ) Amount reclassified from accumulated other comprehensive income (0.6 ) 8.7 — 8.1 Other comprehensive gains (losses), net 4.0 3.3 (12.9 ) (5.6 ) Balance as of September 30, 2015 $ 12.4 $ (0.9 ) $ (30.9 ) $ (19.4 ) ________________________________ (1) The reclassifications out of accumulated other comprehensive loss during the nine months ended September 30, 2015 for realized gains on available-for-sale securities of $0.6 million are included in other (expense) income, net, in the Condensed Consolidated Statements of Operations. (2) The reclassifications out of accumulated other comprehensive loss during the nine months ended September 30, 2015 for realized losses on cash flow hedges are included within cost of revenues of $2.6 million , sales and marketing of $5.5 million , general and administrative of $0.5 million , and research and development of $0.1 million for which the hedged transactions relate in the Condensed Consolidated Statements of Operations.

Employee Benefit Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Employee Benefit Plans	Employee Benefit Plans Equity Incentive Plans The Company’s equity incentive plans include the 2015 Equity Incentive Plan (the “2015 Plan”), the 2006 Equity Incentive Plan (the “2006 Plan”), the Amended and Restated 1996 Stock Plan (the “1996 Plan”), various equity incentive plans assumed through acquisitions, and the 2008 Employee Stock Purchase Plan (the “ESPP”). Under these plans, the Company has granted (or, in the case of acquired plans, assumed) stock options, restricted stock units (“RSUs”), restricted stock awards (“RSAs”), and performance share awards (“PSAs”). The 2015 Plan was adopted and approved by the Company's stockholders in May 2015 and had an initial authorized share reserve of 38.0 million shares of common stock plus the addition of any shares subject to outstanding awards under the 2006 Plan and the 1996 Plan that were outstanding as of May 19, 2015, and that subsequently expire or otherwise terminate, up to a maximum of an additional 29.0 million shares. As of September 30, 2015 , an aggregate of 22.1 million shares were subject to outstanding equity awards under the 2015 Plan, the 2006 Plan and the 1996 Plan. As of September 30, 2015 , 37.7 million shares were available for future issuance under the 2015 Plan and no shares were available for future issuance under the 2006 Plan or the 1996 Plan. The ESPP was adopted and approved by the Company's stockholders in May 2008. To date, the Company's stockholders have approved a share reserve of 26.0 million shares of the Company's common stock for issuance under this plan, which includes an additional 7.0 million shares approved by the Company's stockholders in May 2015. The ESPP permits eligible employees to acquire shares of the Company’s common stock at a 15% discount to the offering price (as determined in the ESPP) through periodic payroll deductions of up to 10% of base compensation, subject to individual purchase limits of 6,000 shares in any twelve -month period or $25,000 worth of stock, determined at the fair market value of the shares at the time the stock purchase option is granted, in one calendar year. As of September 30, 2015 , approximately 18.4 million shares have been issued and 7.6 million shares remain available for future issuance under the ESPP. In connection with certain past acquisitions, the Company assumed stock options, RSUs, RSAs and PSAs under the assumed stock plans of the acquired companies and exchanged the assumed awards for the Company's stock options, RSUs, RSAs and PSAs, respectively. No new equity awards can be granted under these assumed plans. As of September 30, 2015 , stock options, RSUs, RSAs and PSAs representing approximately 2.3 million shares of common stock were outstanding under all awards assumed through the Company's acquisitions. Stock Option Activities The following table summarizes the Company’s stock option activity and related information as of and for the nine months ended September 30, 2015 (in millions, except for per share amounts and years): Outstanding Options Number of Shares Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value Balance as of December 31, 2014 9.9 $ 24.87 Canceled (0.1 ) 23.65 Exercised (2.4 ) 19.10 Expired (2.6 ) 27.91 Balance as of September 30, 2015 4.8 $ 26.07 2.1 $ 20.3 As of September 30, 2015: Vested and expected-to-vest options 4.8 $ 26.16 2.0 $ 19.9 Exercisable options 4.5 $ 27.35 1.8 $ 14.6 The aggregate intrinsic value represents the difference between the Company’s closing stock price on the last trading day of the period, which was $25.71 per share as of September 30, 2015 , and the exercise price of the applicable options multiplied by the number of related options. The pre-tax intrinsic value of options exercised, representing the difference between the fair market value of the Company’s common stock on the date of exercise and the exercise price of each option, was $3.2 million and $17.1 million for the three and nine months ended September 30, 2015 , respectively. Restricted Stock Unit, Restricted Stock Award, and Performance Share Award Activities The following table summarizes the Company’s RSU, RSA, and PSA activity and related information as of and for the nine months ended September 30, 2015 (in millions, except per share amounts and years): Outstanding RSUs, RSAs, and PSAs Number of Shares Weighted Average Grant-Date Fair Value per Share Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value Balance as of December 31, 2014 21.3 $ 22.05 RSUs granted (1)(3) 8.1 22.90 PSAs granted (2)(3) 0.8 22.44 RSUs vested (6.0 ) 23.19 RSAs vested (1.4 ) 20.28 PSAs vested (0.3 ) 22.52 RSUs canceled (1.9 ) 22.09 PSAs canceled (1.0 ) 22.28 Balance as of September 30, 2015 19.6 $ 22.15 1.2 $ 504.4 ________________________________ (1) Includes service-based and market-based RSUs granted under the 2015 Plan and the 2006 Plan according to its terms. (2) The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee are achieved at target is 0.5 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 0.8 million shares. (3) The grant date fair value of RSUs and PSAs were reduced by the present value of dividends expected to be paid on the underlying shares of common stock during the requisite and derived service period as these awards are not entitled to receive dividends until vested. On July 23, 2015, the Company declared a cash dividend of $0.10 per share of common stock, or $38.5 million in the aggregate, to stockholders of record on September 1, 2015, which was paid on September 22, 2015. Employee Stock Purchase Plan The ESPP is implemented in a series of offering periods, each currently six months in duration, or such other period as determined by the Board. Employees purchased 1.3 million and 2.7 million shares of common stock through the ESPP at an average exercise price of $19.18 and $19.25 per share for the three and nine months ended September 30, 2015 , respectively, and 1.4 million and 2.9 million shares at an average per share price of $20.01 and $19.30 for the three and nine months ended September 30, 2014 , respectively. Valuation Assumptions The weighted-average assumptions used and the resulting estimates of fair value for ESPP and market-based RSUs during the three and nine months ended September 30, 2015 and September 30, 2014 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 ESPP (1) : Volatility 26% 27% 29% 30% Risk-free interest rate 0.2% 0.1% 0.1% 0.1% Expected life (years) 0.5 0.5 0.5 0.5 Dividend yield 1.4% 1.8% 1.7% 1.0% Weighted-average fair value per share $6.20 $5.13 $5.63 $5.72 Market-based RSUs (2) : Volatility — — 34% 36% Risk-free interest rate — — 1.4% 1.6% Dividend yield — — 1.8% 0% - 1.5% Weighted-average fair value per share — — $14.97 $18.28 ________________________________ (1) The Black-Scholes-Merton option-pricing model is utilized to estimate the fair value of shares issuable under the ESPP. (2) The fair value of market-based RSUs utilizes a Monte Carlo valuation methodology. The Company amortizes the fair value of these awards over the derived service period adjusted for estimated forfeitures for each separately vesting tranche of the award. Provided that the derived service is rendered, the total fair value of the market-based RSUs at the date of grant is recognized as compensation expense even if the market condition is not achieved. However, the number of shares that ultimately vest can vary significantly with the performance of the specified market criteria. Share-Based Compensation Expense Share-based compensation expense associated with stock options, RSUs, RSAs, PSAs, and ESPP was recorded in the following cost and expense categories in the Condensed Consolidated Statements of Operations (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost of revenues - Product $ 1.3 $ 1.3 $ 4.5 $ 3.9 Cost of revenues - Service 3.2 3.6 10.4 10.7 Research and development 31.0 37.1 94.1 100.8 Sales and marketing 13.0 15.9 32.2 44.9 General and administrative 8.0 7.4 20.1 25.1 Total $ 56.5 $ 65.3 $ 161.3 $ 185.4 The following table summarizes share-based compensation expense by award type (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Stock options $ 1.5 $ 3.2 $ 5.2 $ 12.0 RSUs, RSAs, and PSAs 52.4 58.2 146.3 161.9 ESPP 2.6 3.9 9.8 11.5 Total $ 56.5 $ 65.3 $ 161.3 $ 185.4 The following table presents unrecognized compensation cost, adjusted for estimated forfeitures, recognized over a weighted-average period related to unvested stock options, RSUs, RSAs, and PSAs as of September 30, 2015 (in millions, except years): Unrecognized Compensation Cost Weighted Average Period (In Years) Stock options $ 3.8 0.8 RSUs, RSAs, and PSAs $ 241.9 1.8

Segments

Segments	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segments	Segments The Company realigned its organization into a One-Juniper structure which includes consolidating each of the Company's R&D and go-to-market functions. As a result of these changes, the consolidated business is considered to be one reportable segment, consistent with how the Company’s chief operating decision maker ("CODM") views the business, allocates resources, and assesses the performance of the Company. The Company sells its high-performance networking products and service offerings across routing, switching, and security to service provider and enterprise markets. The following table presents net revenues by product and service (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Routing $ 604.4 $ 533.2 $ 1,711.6 $ 1,700.8 Switching 201.4 155.0 558.1 546.8 Security 119.6 121.3 319.5 367.1 Total product 925.4 809.5 2,589.2 2,614.7 Total service 323.2 316.4 949.0 910.8 Total $ 1,248.6 $ 1,125.9 $ 3,538.2 $ 3,525.5 The Company attributes revenues to geographic region based on the customer’s ship-to location. The following table presents net revenues by geographic region (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Americas: United States $ 665.6 $ 621.3 $ 1,869.7 $ 1,905.7 Other 47.2 57.0 167.9 165.1 Total Americas 712.8 678.3 2,037.6 2,070.8 Europe, Middle East, and Africa 355.0 290.5 975.1 911.0 Asia Pacific 180.8 157.1 525.5 543.7 Total $ 1,248.6 $ 1,125.9 $ 3,538.2 $ 3,525.5 No customer accounted for 10% or more of the Company's net revenues during the three and nine months ended September 30, 2015 and September 30, 2014 , respectively. The following table presents geographic information for property and equipment, net and purchased intangible assets, net (in millions): As of September 30, December 31, United States $ 879.1 $ 871.7 International 120.0 95.0 Property and equipment, net and purchased intangible assets, net $ 999.1 $ 966.7 The Company tracks assets by physical location. The majority of the Company’s assets, excluding cash and cash equivalents and investments, as of September 30, 2015 and December 31, 2014 , were attributable to U.S. operations.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's effective tax rate for the three and nine months ended September 30, 2015 of 20.8% and 26.3% , respectively, differs from the federal statutory rate of 35% primarily due to the benefit of the Section 199 deduction for U.S. production activities, earnings in foreign jurisdictions, which are subject to lower tax rates, and an income tax benefit resulting from a change in the tax treatment of share-based compensation in its cost-sharing arrangement as noted below. The effective rate for the period does not reflect the benefit of the federal research and development (“R&D”) credit, which expired on December 31, 2014. The Company's effective tax rate for the three and nine months ended September 30, 2014 of 37.4% and 28.4% , respectively, differs from the federal statutory rate of 35% primarily due to the impact of the discrete items referenced below offset by the benefit from the Section 199 deduction for U.S. production activities and earnings in foreign jurisdictions, which are subject to lower tax rates. The effective rate for the period does not reflect the benefit of the federal R&D credit, which expired on December 31, 2013. The effective tax rates for the three and nine months ended September 30, 2015 and September 30, 2014 include the tax expense (benefit) of the following discrete items (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost-sharing adjustment (1) $ (13.2 ) $ — $ (13.2 ) $ — Tax on equity investments (2) $ — $ 0.7 $ — $ 36.3 Restructuring $ — $ 9.2 $ — $ (46.7 ) Legal settlement $ — $ — $ — $ 44.7 ________________________________ (1) Represents cumulative impact through fiscal year 2014 for the change in treatment of share-based compensation as a result of the U.S. Tax Court decision in Altera (see further explanation below). The total net benefit to the Condensed Consolidated Statements of Operations including the nine months ended September 30, 2015 was approximately $18.0 million . (2) During the nine months ended September 30, 2014 , tax on equity investments of $36.3 million is net of a valuation allowance release of $24.7 million . In July 2015, the United States Tax Court (the “Court”) issued an opinion favorable to Altera Corporation (“Altera”) with respect to Altera’s litigation with the Internal Revenue Service (“IRS”). The litigation relates to the treatment of share-based compensation expense in an inter-company cost-sharing arrangement with Altera’s foreign subsidiary. In its opinion, the Court accepted Altera’s position of excluding share-based compensation from its inter-company cost-sharing arrangement. As a result, the Company has reversed the inclusion of share-based compensation in cost-sharing arrangement as a cumulative adjustment for this quarter. Because this change to cost sharing increases the Company's cumulative foreign earnings, approximately $70.3 million of the gross income tax benefit associated with this change has been offset by an increase in income tax expense accrued upon the company’s foreign earnings. The Company will continue to monitor ongoing developments and potential impacts to its financial statements. As of September 30, 2015 , the total amount of gross unrecognized tax benefits was $211.4 million , of which $176.7 million , if recognized, would affect the Company's effective tax rate. The Company engages in continuous discussions and negotiations with tax authorities regarding tax matters in various jurisdictions. There is a greater than remote likelihood that the balance of the gross unrecognized tax benefits will decrease by approximately $4.7 million within the next twelve months due to lapses of applicable statutes of limitations and the completion of tax review cycles in various tax jurisdictions. The Company is currently under examination by the Internal Revenue Service (“IRS”) for the 2007 through 2009 tax years and the California Franchise Tax Board for the 2004 through 2006 tax years. During the first quarter of 2015, the IRS issued “Notices of Proposed Adjustments” related to the examination. The Company regularly assesses the likelihood of an adverse outcome resulting from such examinations. As of September 30, 2015, the Company believes the resolution of the audits will not have a material adverse impact on the financial statements. The Company is also subject to separate ongoing examinations by the India tax authorities for the 2004 tax year, 2004 through 2008 tax years, and the 2008 through 2010 tax years. In 2008, the Company received a proposed adjustment from the India tax authorities related to the 2004 tax year. In 2009, the India tax authorities commenced a separate investigation of our 2004 through 2008 tax returns and are disputing the Company's determination of taxable income due to the cost basis of certain fixed assets. The Company accrued $4.6 million in penalties and interest in 2009 related to this matter. The Company understands that in accordance with the administrative and judicial process in India, the Company may be required to make payments that are substantially higher than the amount accrued in order to ultimately settle this issue. The Company strongly believes that any assessment it may receive in excess of the amount accrued would be inconsistent with applicable India tax laws and intends to defend this position vigorously. The Company is pursuing all available administrative remedies relative to these matters. The Company believes that it has adequately provided for any reasonably foreseeable outcomes related to these proposed adjustments and the ultimate resolution of these matters is unlikely to have a material effect on its consolidated financial condition or results of operations; however there is still a possibility that an adverse outcome of these matters could have a material effect on its consolidated financial condition and results of operations. The Company is not aware of any other examinations by tax authorities in any other major jurisdictions in which it files income tax returns as of September 30, 2015.

Net Income Per Share

Net Income Per Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share The Company computed basic and diluted net income per share attributable to Juniper Networks common stockholders as follows (in millions, except per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Numerator: Net income $ 197.7 $ 103.6 $ 435.9 $ 435.3 Denominator: Weighted-average shares used to compute basic net income per share 382.8 448.4 393.2 468.1 Dilutive effect of employee stock awards 6.4 6.4 8.0 8.9 Weighted-average shares used to compute diluted net income per share 389.2 454.8 401.2 477.0 Net income per share attributable to Juniper Networks common stockholders: Basic $ 0.52 $ 0.23 $ 1.11 $ 0.93 Diluted $ 0.51 $ 0.23 $ 1.09 $ 0.91 Anti-dilutive: Potential anti-dilutive shares 3.1 10.2 3.7 10.8 Basic net income per share is computed using net income available to common stockholders and the weighted-average number of common shares outstanding for the period. Diluted net income per share is computed using net income available to common stockholders and the weighted-average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Dilutive potential common shares consist of common shares issuable upon exercise of stock options, issuances of ESPP, and vesting of RSUs, RSAs, and PSAs. The Company includes the common shares underlying PSAs in the calculation of diluted net income per share when they become contingently issuable and excludes such shares when they are not contingently issuable. Potentially dilutive common shares were excluded from the computation of diluted net income per share because their effect would be anti-dilutive.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Operating Leases The Company leases its facilities and certain equipment under non-cancelable operating leases that expire at various dates through October 31, 2024 . Certain leases require the Company to pay variable costs such as taxes, maintenance, and insurance and include renewal options and escalation clauses. Future minimum payments under the non-cancelable operating leases totaled $123.1 million as of September 30, 2015 . Rent expense was $10.8 million and $33.2 million for the three and nine months ended September 30, 2015 , respectively, and $10.8 million and $36.5 million for the three and nine months ended September 30, 2014 , respectively. Data Center Lease Agreement On July 10, 2015, the Company entered into a data center lease agreement through March 2026 in which the Company has the option to extend the term of the lease for up to twenty years in increments of either five years or ten years, for approximately 63,000 square feet of space in the State of Washington. The total payment for the lease is expected to be approximately $118.1 million over the ten -year term. The lease agreement provides the Company with a tenant allowance of $6.0 million to be used for tenant leasehold improvements. Any unused tenant allowance may be applied as a credit to the rent payment. The space will be used, among other things, to consolidate certain of the Company's laboratory operations currently located in Sunnyvale, California. As the Company is subject to certain contractual obligations during the construction period, the Company is deemed the owner of the property during the construction period. Accordingly, as of September 30, 2015 , the Company capitalized the construction cost by recording a build-to-suit lease asset under construction in progress of $10.1 million , which is a component of property and equipment, net, and a corresponding build-to-suit financing liability, which is a component of other long-term liabilities, in the Condensed Consolidated Balance Sheets. Purchase Commitments with Contract Manufacturers and Suppliers In order to reduce manufacturing lead times and help ensure adequate component supply, the Company enters into agreements with contract manufacturers and certain suppliers to procure inventory based on the Company's requirements. A significant portion of the Company's purchase commitments arising from these agreements consists of firm and non-cancelable commitments. These purchase commitments totaled $558.7 million as of September 30, 2015 . The Company establishes a liability in connection with purchase commitments related to quantities in excess of its demand forecasts or obsolete materials charges for components purchased by the contract manufacturers based on the Company’s demand forecast or customer orders. As of September 30, 2015 , the Company accrued $19.2 million based on its estimate of such charges. Debt and Interest Payment on Debt As of September 30, 2015 , the Company held short-term and long-term debt consisting of senior notes with a carrying value of $299.9 million and $1,648.7 million , respectively. Of these Notes, $300.0 million will mature in 2016 and bears interest at a fixed rate of 3.10% , $300.0 million will mature in 2020 and bears interest at a rate of 3.30% , $300.0 million will mature in 2021 and bears interest at a fixed rate of 4.60% , $350.0 million will mature in 2024 and bears interest at a fixed rate of 4.50% , $300.0 million will mature in 2025 and bears interest at a fixed rate of 4.35% , and $400.0 million will mature in 2041 and bears interest at a fixed rate of 5.95% . Interest on the Notes is payable semiannually. See Note 9, Debt and Financing , for further discussion of the Company's short-term and long-term debt. Other Contractual Obligations As of September 30, 2015 , other contractual obligations primarily consisted of (1) $33.9 million in indemnity and employee-related obligations and service-related escrows, including those required in connection with certain asset purchases and acquisitions completed by the Company between 2005 and 2014; (2) $3.5 million in campus build-out obligations; and (3) $22.5 million of agreements that include firm and non-cancelable terms to transfer funds in the future for fixed or minimum amounts or quantities to be purchased at fixed or minimum prices. Tax Liabilities As of September 30, 2015 , the Company had $185.0 million included in long-term income taxes payable in the Condensed Consolidated Balance Sheets for unrecognized tax positions. At this time, the Company is unable to make a reasonably reliable estimate of the timing of payments related to this amount due to uncertainties in the timing of tax audit outcomes. Guarantees The Company enters into agreements with customers that contain indemnification provisions relating to potential situations where claims could be alleged that the Company’s products solely, or in combination with other third party products, infringe the intellectual property rights of a third-party. As of September 30, 2015, the Company recorded a $15.0 million liability for such indemnification obligations in other accrued liabilities in the Condensed Consolidated Balance Sheets. The Company also has financial guarantees consisting of guarantees of product and service performance, guarantees related to third-party customer-financing arrangements, custom and duty guarantees, and standby letters of credit for certain lease facilities. As of September 30, 2015 and December 31, 2014 , the Company had $16.8 million and $26.2 million , respectively, in financing arrangements, bank guarantees, and standby letters of credit related to these financial guarantees, of which $11.2 million in financing guarantees was recorded in other accrued liabilities and other long-term liabilities in the Condensed Consolidated Balance Sheets as of September 30, 2015 . See Note 9, Debt and Financing , for further discussion of the Company's third-party customer financing arrangements that contain guarantee provisions. Legal Proceedings Investigations The U.S. Securities and Exchange Commission (SEC) and the U.S. Department of Justice (DOJ) are conducting investigations into possible violations by the Company of the U.S. Foreign Corrupt Practices Act (FCPA). The Company is cooperating with these agencies regarding these matters. The Company’s Audit Committee, with the assistance of independent advisors, has been investigating and conducting a thorough review of possible violations of the FCPA, and has made recommendations for remedial measures, including employee disciplinary actions in foreign jurisdictions, which the Company has implemented and continues to implement. The Company is unable to predict the duration, scope or outcome of the SEC and DOJ investigations, but believes that an adverse outcome is reasonably possible. However, the Company is not able to estimate a reasonable range of possible loss. The SEC and/or DOJ could take action against us or we could agree to settle. In such event, we could be required to pay substantial fines and sanctions and/or implement additional remedial measures; in addition, it may be determined that we violated the FCPA. Other Litigation In addition to the investigations discussed above, the Company is involved in other disputes, litigation, and other legal actions. The Company is aggressively defending these current litigation matters, and while there can be no assurances and the outcome of these matters is currently not determinable, and the Company currently believes that none of these existing claims or proceedings are likely to have a material adverse effect on its financial position. There are many uncertainties associated with any litigation and these actions or other third-party claims against the Company may cause the Company to incur costly litigation and/or substantial settlement charges. In addition, the resolution of any intellectual property litigation may require the Company to make royalty payments, which could adversely affect gross margins in future periods. If any of those events were to occur, the Company's business, financial condition, results of operations, and cash flows could be adversely affected. The actual liability in any such matters may be materially different from the Company's estimates, if any, which could result in the need to adjust the liability and record additional expenses. We record an accrual for loss contingencies for legal proceedings when we believe that an unfavorable outcome is both (a) probable and (b) the amount or range of any possible loss is reasonably estimable. We have not recorded any accrual for loss contingencies associated with such legal proceedings or the investigations discussed above.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Promissory note in connection with the sale of Junos Pulse On October 2, 2015, the Company and the issuer of the promissory note in the original principal amount of $125.0 million that was issued to the Company in connection with the sale of Junos Pulse mutually agreed to amend the terms of the promissory note. The amended promissory note, among other things, extends the maturity date from April 1, 2016 to December 31, 2018, provides that interest due and payable on the promissory note through December 31, 2015 shall be paid in kind by increasing the outstanding principal amount of the note, increases the interest rate on the promissory note, adds semi-annual excess cash flow sweeps commencing in 2016, and requires certain other debt to be subordinated to the promissory note issued to the Company. In addition, under the amended terms of the promissory note, the issuer is required to make a minimum payment of $75.0 million on or prior to April 1, 2017, less any amounts previously pre-paid to the Company, and to use commercially reasonable efforts to refinance the entire note, with any remaining balance due by December 31, 2018. In connection with the amendment, certain holding companies of the issuer also provided the Company with a guarantee and additional collateral to secure the repayment of the amended promissory note. Dividend Declaration On October 22, 2015, the Company announced that it had declared a cash dividend of $0.10 per share of common stock payable on December 22, 2015 to stockholders of record as of the close of business on December 1, 2015. Stock Repurchase Activities Subsequent to September 30, 2015 , through the filing of this Report, the Company repurchased 1.1 million shares of its common stock, for an aggregate of $35.0 million at an average purchase price of $31.59 per share, under the 2014 Stock Repurchase Program. Repurchases of 0.8 million shares were settled prior to the filing of this Report and the remaining shares will be settled after the filing date. Under the 2014 Stock Repurchase Program, the Company has $590.0 million authorized funds remaining as of the filing date. Purchases under the Company's stock repurchase program are subject to review of the circumstances in place at the time and will be made from time to time as permitted by securities laws and other legal requirements. This program may be discontinued at any time.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Recent accounting pronouncements	Recent Accounting Pronouncements In September 2015, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2015-16 (Topic 805) - Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments , which replaces the requirement that an acquirer in a business combination account for measurement period adjustments retrospectively, with a requirement that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. ASU 2015-16 requires the entity to record, in the same period's financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. The amendment requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The amendment should be applied prospectively to adjustments to provisional amounts that occur after the effective date of the guidance, with early adoption permitted for financial statements that have not been issued. The adoption of this standard is not expected to have a significant impact on the Company's Condensed Consolidated Financial Statements. In July 2015, the FASB issued ASU No. 2015-11 (Subtopic 330) - Simplifying the Measurement of Inventory, which provides guidance to companies who account for inventory using either the first-in, first-out ("FIFO") or average cost methods. The guidance states that companies should measure inventory at the lower of cost and net realizable value. Net realizable value is defined as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. ASU 2015-11 is effective for fiscal years beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In June 2015, the FASB issued ASU No. 2015-10 - Technical Corrections and Improvements, which contains minor guidance clarifications and reference corrections, simplification of the Codification, and minor improvements on a wide variety of topics. ASU 2015-10 is effective for fiscal years beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In April 2015, the FASB issued ASU No. 2015-05 (Subtopic 350-40) - Customer's Accounting for Fees Paid in a Cloud Computing Arrangement , which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, beginning after December 15, 2015. Early adoption is permitted. The Company is currently evaluating the impact of the adoption on its Condensed Consolidated Financial Statements, if any. In April 2015, the FASB issued ASU No. 2015-03 (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs , which requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard would reduce the debt issuance cost asset on the Company's Condensed Consolidated Balance Sheet by approximately $11.0 million and correspondingly reduce its debt liabilities by approximately $11.0 million . The Company plans to adopt this standard in the first quarter of 2016. The adoption of this standard will not have an impact to the Condensed Consolidated Statement of Operations. In August 2015, the FASB issued ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU 2015-15 provides additional guidance to ASU 2015-03, which did not address presentation or subsequent measurement of debt issuance costs related to line-of-credit arrangements. The amendment states that an entity may defer and present debt issuance costs associated with line-of-credit arrangements as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. The adoption of ASU 2015-15 is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In January 2015, the FASB issued ASU No. 2015-01 (Subtopic 225-20) - Income Statement - Extraordinary and Unusual Items , which eliminates the concept of extraordinary items. ASU 2015-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this standard will not have an impact on the Company's Condensed Consolidated Financial Statements. In November 2014, the FASB issued ASU No. 2014-16 (Topic 815) - Derivatives and Hedging , which provides clarification on how current guidance should be interpreted in evaluating the economic characteristics and risks of a host contract in a hybrid financial instrument that is issued in the form of a share. Specifically, the amendments clarify that an entity should consider all relevant terms and features in evaluating the host contract and that no single term or feature would necessarily determine the economic characteristics and risks of the host contract. ASU 2014-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. The amendment should be applied on a modified retrospective basis to existing hybrid financial instruments issued in the form of a share as of the beginning of the year for which the amendments are effective. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company's Condensed Consolidated Financial Statements. In August 2014, the FASB issued ASU No. 2014-15 (Subtopic 205-40) - Presentation of Financial Statements—Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (“ASU 2014-15”) which provides guidance about management's responsibility to evaluate whether or not there is substantial doubt about the Company's ability to continue as a going concern and to provide related footnote disclosure. ASU 2014-15 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early application is permitted. The adoption of this standard is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In June 2014, the FASB issued ASU No. 2014-12 (Topic 718) - Compensation - Stock Compensation (“ASU 2014-12”) which provides guidance that a performance target that affects vesting of a share-based payment and that could be achieved after the requisite service period is a performance condition. As a result, the target is not reflected in the estimation of the award’s grant date fair value. Compensation cost for such an award would be recognized over the required service period, if it is probable that the performance condition will be achieved. ASU 2014-12 is effective for all entities for annual periods beginning after December 15, 2015 and interim periods within those annual periods. ASU 2014-12 should be applied on a prospective basis to awards that are granted or modified on or after the effective date. The adoption of this standard is not expected to have an impact on the Company's Condensed Consolidated Financial Statements. In May 2014, the FASB issued ASU No. 2014-09 (Topic 606) —Revenue from Contracts with Customers (“ASU 2014-09”) which provides guidance for revenue recognition. This ASU affects all contracts that the Company enters into with customers to transfer goods and services or for the transfer of nonfinancial assets. This ASU will supersede the revenue recognition requirements in Topic 605, and most industry specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts. The standard's core principle is that revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. In doing so, the Company will need to use additional judgment and estimates than under the existing guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. In August 2015, the FASB issued ASU 2015-14 which deferred the effective date of the new revenue standard from December 15, 2016 to December 15, 2017, with early adoption permitted as of annual reporting periods beginning after December 15, 2016. As a result, the Company will apply the new revenue standard for annual and interim periods beginning after December 15, 2017. Accordingly, the ASU will be effective for the Company beginning fiscal year 2018. The Company is currently evaluating the impact of the adoption of this standard on its Condensed Consolidated Financial Statements.

Cash Equivalents and Investme25

Cash Equivalents and Investments (Tables)	9 Months Ended
	Sep. 30, 2015
Cash Equivalents and Investments [Abstract]
Unrealized gains and losses and fair value of available-for-sale and trading securities	The following tables summarize the Company's unrealized gains and losses and fair value of investments designated as available-for-sale and trading securities as of September 30, 2015 and December 31, 2014 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of September 30, 2015 Fixed income securities: Asset-backed securities $ 324.2 $ 0.1 $ (0.2 ) $ 324.1 Certificates of deposit 3.8 — — 3.8 Commercial paper 9.4 — — 9.4 Corporate debt securities 935.8 0.7 (1.9 ) 934.6 Foreign government debt securities 16.5 — — 16.5 Government-sponsored enterprise obligations 214.1 0.1 — 214.2 U.S. government securities 265.3 0.2 (0.1 ) 265.4 Total fixed income securities 1,769.1 1.1 (2.2 ) 1,768.0 Money market funds 196.0 — — 196.0 Mutual funds 3.7 0.1 — 3.8 Publicly-traded equity securities 8.0 0.7 — 8.7 Total available-for-sale securities 1,976.8 1.9 (2.2 ) 1,976.5 Trading securities in mutual funds (1) 16.8 — — 16.8 Total $ 1,993.6 $ 1.9 $ (2.2 ) $ 1,993.3 Reported as: Cash equivalents $ 166.3 $ — $ — $ 166.3 Restricted investments 33.4 0.1 — 33.5 Short-term investments 529.1 0.9 (0.1 ) 529.9 Long-term investments 1,264.8 0.9 (2.1 ) 1,263.6 Total $ 1,993.6 $ 1.9 $ (2.2 ) $ 1,993.3 ________________________________ (1) Balance consists of the Company's non-qualified deferred compensation plan assets. Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of December 31, 2014 Fixed income securities: Asset-backed securities $ 269.3 $ — $ (0.3 ) $ 269.0 Certificates of deposit 10.6 — — 10.6 Commercial paper 20.3 — — 20.3 Corporate debt securities 738.6 0.5 (1.1 ) 738.0 Foreign government debt securities 24.6 — — 24.6 Government-sponsored enterprise obligations 162.2 — (0.1 ) 162.1 U.S. government securities 246.1 — (0.1 ) 246.0 Total fixed income securities 1,471.7 0.5 (1.6 ) 1,470.6 Money market funds 594.2 — — 594.2 Mutual funds 3.9 0.1 — 4.0 Publicly-traded equity securities 2.1 — (0.1 ) 2.0 Total available-for-sale securities 2,071.9 0.6 (1.7 ) 2,070.8 Trading securities in mutual funds (1) 16.3 — — 16.3 Total $ 2,088.2 $ 0.6 $ (1.7 ) $ 2,087.1 Reported as: Cash equivalents $ 576.6 $ — $ — $ 576.6 Restricted investments 45.2 — — 45.2 Short-term investments 332.2 0.2 (0.2 ) 332.2 Long-term investments 1,134.2 0.4 (1.5 ) 1,133.1 Total $ 2,088.2 $ 0.6 $ (1.7 ) $ 2,087.1 ________________________________ (1) Balance consists of the Company's non-qualified deferred compensation plan assets.
Maturities of fixed income securities	The following table presents the contractual maturities of the Company's total fixed income securities as of September 30, 2015 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Due in less than one year $ 504.2 $ 0.3 $ (0.1 ) $ 504.4 Due between one and five years 1,264.9 0.8 (2.1 ) 1,263.6 Total $ 1,769.1 $ 1.1 $ (2.2 ) $ 1,768.0
Available-for-sale securities in unrealized loss position	The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of September 30, 2015 and December 31, 2014 (in millions): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of September 30, 2015 Fixed income securities: Asset-backed securities (1) $ 188.5 $ (0.2 ) $ 34.2 $ — $ 222.7 $ (0.2 ) Corporate debt securities 522.0 (1.8 ) 17.5 (0.1 ) 539.5 (1.9 ) Foreign government debt securities (1)(2) 13.5 — — — 13.5 — Government-sponsored enterprise obligations (1)(2) 41.8 — — — 41.8 — U.S. government securities (1) 119.5 (0.1 ) — — 119.5 (0.1 ) Total fixed income securities 885.3 (2.1 ) 51.7 (0.1 ) 937.0 (2.2 ) Total available-for-sale securities $ 885.3 $ (2.1 ) $ 51.7 $ (0.1 ) $ 937.0 $ (2.2 ) ________________________________ (1) Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of September 30, 2015 . (2) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of September 30, 2015 . Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2014 Fixed income securities: Asset-backed securities $ 221.9 $ (0.3 ) $ — $ — $ 221.9 $ (0.3 ) Corporate debt securities 515.9 (1.1 ) — — 515.9 (1.1 ) Foreign government debt securities (1) 24.6 — — — 24.6 — Government-sponsored enterprise obligations 113.8 (0.1 ) — — 113.8 (0.1 ) U.S. government securities 189.0 (0.1 ) — — 189.0 (0.1 ) Total fixed income securities 1,065.2 (1.6 ) — — 1,065.2 (1.6 ) Publicly-traded equity securities 2.0 (0.1 ) — — 2.0 (0.1 ) Total available-for-sale securities $ 1,067.2 $ (1.7 ) $ — $ — $ 1,067.2 $ (1.7 ) ________________________________ (1) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2014 .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Assets measured at fair value on a recurring basis	The following tables provide a summary of assets and liabilities measured at fair value on a recurring basis and as reported in the Condensed Consolidated Balance Sheets (in millions): Fair Value Measurements at September 30, 2015 Using: Quoted Prices in Active Markets For Identical Assets Significant Other Observable Remaining Inputs Significant Other Unobservable Remaining Inputs (Level 1) (Level 2) (Level 3) Total Assets measured at fair value: Available-for-sale securities: Asset-backed securities $ — $ 324.1 $ — $ 324.1 Certificates of deposit — 3.8 — 3.8 Commercial paper — 9.4 — 9.4 Corporate debt securities — 934.6 — 934.6 Foreign government debt securities — 16.5 — 16.5 Government-sponsored enterprise obligations — 214.2 — 214.2 Money market funds (1) 196.0 — — 196.0 Mutual funds (2) 3.8 — — 3.8 Publicly-traded equity securities 8.7 — — 8.7 U.S. government securities 265.4 — — 265.4 Total available-for-sale securities 473.9 1,502.6 — 1,976.5 Trading securities in mutual funds (3) 16.8 — — 16.8 Privately-held debt and redeemable preferred stock securities — — 48.9 48.9 Derivative assets: Foreign exchange contracts — 0.6 — 0.6 Total assets measured at fair value $ 490.7 $ 1,503.2 $ 48.9 $ 2,042.8 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (1.3 ) $ — $ (1.3 ) Total liabilities measured at fair value $ — $ (1.3 ) $ — $ (1.3 ) Total assets measured at fair value, reported as: Cash equivalents $ 166.3 $ — $ — $ 166.3 Restricted investments 33.5 — — 33.5 Short-term investments 135.1 394.8 — 529.9 Long-term investments 155.8 1,107.8 — 1,263.6 Prepaid expenses and other current assets — 0.6 — 0.6 Other long-term assets — — 48.9 48.9 Total assets measured at fair value $ 490.7 $ 1,503.2 $ 48.9 $ 2,042.8 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (1.3 ) $ — $ (1.3 ) Total liabilities measured at fair value $ — $ (1.3 ) $ — $ (1.3 ) ________________________________ (1) Balance includes $29.7 million of restricted investments measured at fair market value related to the Company's D&O Trust and acquisition-related escrows. (2) Balance relates to restricted investments measured at fair market value related to the Company's India Gratuity Trust. (3) Balance relates to investments measured at fair value related to the Company's non-qualified deferred compensation plan assets. Fair Value Measurements at December 31, 2014 Using: Quoted Prices in Active Markets For Identical Assets Significant Other Observable Remaining Inputs Significant Other Unobservable Remaining Inputs (Level 1) (Level 2) (Level 3) Total Assets measured at fair value: Available-for-sale securities: Asset-backed securities $ — $ 269.0 $ — $ 269.0 Certificates of deposit — 10.6 — 10.6 Commercial paper — 20.3 — 20.3 Corporate debt securities — 738.0 — 738.0 Foreign government debt securities — 24.6 — 24.6 Government-sponsored enterprise obligations — 162.1 — 162.1 Money market funds (1) 594.2 — — 594.2 Mutual funds (2) 4.0 — — 4.0 Publicly-traded equity securities 2.0 — — 2.0 U.S. government securities 246.0 — — 246.0 Total available-for-sale securities 846.2 1,224.6 — 2,070.8 Trading securities in mutual funds (3) 16.3 — — 16.3 Privately-held debt and redeemable preferred stock securities — — 47.5 47.5 Derivative assets: Foreign exchange contracts — 0.1 — 0.1 Total assets measured at fair value $ 862.5 $ 1,224.7 $ 47.5 $ 2,134.7 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (3.9 ) $ — $ (3.9 ) Total liabilities measured at fair value $ — $ (3.9 ) $ — $ (3.9 ) Total assets measured at fair value, reported as: Cash equivalents $ 552.9 $ 23.7 $ — $ 576.6 Restricted investments 45.2 — — 45.2 Short-term investments 87.0 245.2 — 332.2 Long-term investments 177.4 955.7 — 1,133.1 Prepaid expenses and other current assets — 0.1 — 0.1 Other long-term assets — — 47.5 47.5 Total assets measured at fair value $ 862.5 $ 1,224.7 $ 47.5 $ 2,134.7 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (3.9 ) $ — $ (3.9 ) Total liabilities measured at fair value $ — $ (3.9 ) $ — $ (3.9 ) ________________________________ (1) Balance includes $41.3 million of restricted investments measured at fair market value related to the Company's D&O Trust and acquisition-related escrows. (2) Balance relates to restricted investments measured at fair market value related to the Company's India Gratuity Trust. (3) Balance relates to investments measured at fair value related to the Company's non-qualified deferred compensation plan assets.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative instruments	The notional amount of the Company's foreign currency derivatives are summarized as follows (in millions): As of September 30, December 31, Cash flow hedges $ 116.3 $ 160.7 Non-designated derivatives 55.9 78.0 Total $ 172.2 $ 238.7

Goodwill and Purchased Intang28

Goodwill and Purchased Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	The following table presents goodwill activity during the nine months ended September 30, 2015 (in millions): Balance as of December 31, 2014 $ 2,981.5 Other (0.2 ) Balance as of September 30, 2015 $ 2,981.3
Finite-lived intangible assets by major class	The Company’s purchased intangible assets were as follows (in millions): Gross Accumulated Amortization Accumulated Impairments and Other Charges Net As of September 30, 2015 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (487.2 ) $ (49.9 ) $ 30.6 Customer contracts, support agreements, and related relationships 78.1 (67.2 ) (2.8 ) 8.1 Other 1.1 (0.6 ) — 0.5 Total purchased intangible assets $ 646.9 $ (555.0 ) $ (52.7 ) $ 39.2 As of December 31, 2014 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (466.1 ) $ (49.9 ) $ 51.7 Customer contracts, support agreements, and related relationships 78.1 (65.2 ) (2.8 ) 10.1 Other 1.1 (0.5 ) — 0.6 Total purchased intangible assets $ 646.9 $ (531.8 ) $ (52.7 ) $ 62.4
Amortization of intangible assets included in the Condensed Consolidated Statements of Operations	The following table presents the amortization of intangible assets included in the Condensed Consolidated Statements of Operations (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost of revenues $ 4.7 $ 7.1 $ 20.2 $ 23.7 Operating expenses: Sales and marketing 0.7 1.1 2.1 3.2 General and administrative 0.2 0.3 0.9 0.9 Total operating expenses 0.9 1.4 3.0 4.1 Total $ 5.6 $ 8.5 $ 23.2 $ 27.8
Estimated future amortization expense of purchased intangible assets with finite lives	As of September 30, 2015 , the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions): Years Ending December 31, Amount Remainder of 2015 $ 5.3 2016 11.6 2017 7.0 2018 5.1 2019 4.9 Thereafter 5.3 Total $ 39.2

Other Financial Information (Ta

Other Financial Information (Tables)	9 Months Ended
	Sep. 30, 2015
Other Financial Information [Abstract]
Inventories	Total inventories consisted of the following (in millions): As of September 30, December 31, Production materials $ 45.2 $ 38.3 Finished goods 27.1 24.2 Inventories $ 72.3 $ 62.5
Other long-term assets	Other long-term assets consisted of the following (in millions): As of September 30, December 31, Privately-held investments $ 91.3 $ 89.9 Licensed software 7.7 8.6 Federal income tax receivable 28.9 20.0 Customer financing receivable 1.5 16.9 Inventory 8.7 8.0 Prepaid costs, deposits, and other 60.5 35.5 Promissory note in connection with the sale of Junos Pulse 125.0 125.0 Interest receivable in connection with Promissory note 6.3 — Other long-term assets $ 329.9 $ 303.9
Warranties	Changes in the Company’s warranty reserve during the nine months ended September 30, 2015 were as follows (in millions): Balance as of December 31, 2014 $ 28.7 Provisions made during the period 20.8 Actual costs incurred during the period (21.2 ) Balance as of September 30, 2015 $ 28.3
Deferred revenue	Details of the Company's deferred revenue, as reported in the Condensed Consolidated Balance Sheets, were as follows (in millions): As of September 30, December 31, Deferred product revenue: Undelivered product commitments and other product deferrals $ 221.7 $ 180.3 Distributor inventory and other sell-through items 63.1 103.7 Deferred gross product revenue 284.8 284.0 Deferred cost of product revenue (43.7 ) (58.4 ) Deferred product revenue, net 241.1 225.6 Deferred service revenue 883.8 850.1 Total $ 1,124.9 $ 1,075.7 Reported as: Current $ 814.4 $ 780.8 Long-term 310.5 294.9 Total $ 1,124.9 $ 1,075.7
Other income (expense), net	Other (expense) income, net, consisted of the following (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Interest income $ 5.7 $ 2.7 $ 16.3 $ 6.9 Interest expense (21.6 ) (16.9 ) (61.9 ) (50.2 ) Net gain on legal settlement — 0.8 — 196.1 Gain (loss) on investments 6.0 (1.9 ) 6.8 165.1 Other 1.5 8.5 (2.5 ) 8.1 Other (expense) income, net $ (8.4 ) $ (6.8 ) $ (41.3 ) $ 326.0

Restructuring and Other Charg30

Restructuring and Other Charges (Tables)	9 Months Ended
	Sep. 30, 2015
Restructuring Charges [Abstract]
Summary of restructuring and other charges	The following table presents restructuring and other charges and (benefits) included in cost of revenues and restructuring and other (benefits) charges in the Condensed Consolidated Statements of Operations under the Company's restructuring plans (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Severance $ — $ 7.1 $ 0.4 $ 45.6 Facilities — (25.0 ) (0.9 ) 12.8 Contract terminations — — — 2.3 Asset impairment and write-downs (3.5 ) 2.9 (3.5 ) 118.7 Total $ (3.5 ) $ (15.0 ) $ (4.0 ) $ 179.4 Reported as: Cost of revenues $ (3.5 ) $ — $ (3.5 ) $ 22.2 Restructuring and other (benefits) charges — (15.0 ) (0.5 ) 157.2 Total $ (3.5 ) $ (15.0 ) $ (4.0 ) $ 179.4
Changes in restructuring liability	The following table provides a summary of changes in the restructuring liability related to the Company's plans during the nine months ended September 30, 2015 (in millions): December 31, Charges Cash Payments Non-cash Settlements and Other September 30, Severance $ 9.4 $ 0.4 $ (8.0 ) $ (1.8 ) $ — Facilities 7.4 (0.9 ) (2.3 ) (0.7 ) 3.5 Contract terminations and other 0.2 (3.5 ) — 3.3 — Total $ 17.0 $ (4.0 ) $ (10.3 ) $ 0.8 $ 3.5

Debt and Financing (Tables)

Debt and Financing (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Instruments [Abstract]
Long-term debt	The following table summarizes the Company's short-term and long-term debt (in millions, except percentages): As of September 30, 2015 Amount Effective Interest Rates Senior Notes: 3.10% fixed-rate notes, due March 2016 $ 300.0 3.25 % 3.30% fixed-rate notes, due June 2020 300.0 3.47 % 4.60% fixed-rate notes, due March 2021 300.0 4.69 % 4.50% fixed-rate notes, due March 2024 350.0 4.63 % 4.35% fixed-rate notes, due June 2025 300.0 4.47 % 5.95% fixed-rate notes, due March 2041 400.0 6.03 % Total senior notes 1,950.0 Unaccreted discount (1.4 ) Total $ 1,948.6 Reported as: Short-term debt $ 299.9 Long-term debt 1,648.7 Total $ 1,948.6

Equity (Tables)

Equity (Tables)	9 Months Ended
	Sep. 30, 2015
Stockholders' Equity Note [Abstract]
Components of accumulated other comprehensive income, net of taxes	The components of accumulated other comprehensive loss, net of related taxes, during the nine months ended September 30, 2015 were as follows (in millions): Unrealized Gains (Losses) on Available-for- Sale Securities (1) Unrealized Gains (Losses) on Cash Flow Hedges (2) Foreign Currency Translation Adjustments Total Balance as of December 31, 2014 $ 8.4 $ (4.2 ) $ (18.0 ) $ (13.8 ) Other comprehensive gain (loss) before reclassifications 4.6 (5.4 ) (12.9 ) (13.7 ) Amount reclassified from accumulated other comprehensive income (0.6 ) 8.7 — 8.1 Other comprehensive gains (losses), net 4.0 3.3 (12.9 ) (5.6 ) Balance as of September 30, 2015 $ 12.4 $ (0.9 ) $ (30.9 ) $ (19.4 ) ________________________________ (1) The reclassifications out of accumulated other comprehensive loss during the nine months ended September 30, 2015 for realized gains on available-for-sale securities of $0.6 million are included in other (expense) income, net, in the Condensed Consolidated Statements of Operations. (2) The reclassifications out of accumulated other comprehensive loss during the nine months ended September 30, 2015 for realized losses on cash flow hedges are included within cost of revenues of $2.6 million , sales and marketing of $5.5 million , general and administrative of $0.5 million , and research and development of $0.1 million for which the hedged transactions relate in the Condensed Consolidated Statements of Operations.

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of share-based compensation, stock options, activity	The following table summarizes the Company’s stock option activity and related information as of and for the nine months ended September 30, 2015 (in millions, except for per share amounts and years): Outstanding Options Number of Shares Weighted Average Exercise Price per Share Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value Balance as of December 31, 2014 9.9 $ 24.87 Canceled (0.1 ) 23.65 Exercised (2.4 ) 19.10 Expired (2.6 ) 27.91 Balance as of September 30, 2015 4.8 $ 26.07 2.1 $ 20.3 As of September 30, 2015: Vested and expected-to-vest options 4.8 $ 26.16 2.0 $ 19.9 Exercisable options 4.5 $ 27.35 1.8 $ 14.6
Schedule of nonvested share activity	The following table summarizes the Company’s RSU, RSA, and PSA activity and related information as of and for the nine months ended September 30, 2015 (in millions, except per share amounts and years): Outstanding RSUs, RSAs, and PSAs Number of Shares Weighted Average Grant-Date Fair Value per Share Weighted Average Remaining Contractual Term (In Years) Aggregate Intrinsic Value Balance as of December 31, 2014 21.3 $ 22.05 RSUs granted (1)(3) 8.1 22.90 PSAs granted (2)(3) 0.8 22.44 RSUs vested (6.0 ) 23.19 RSAs vested (1.4 ) 20.28 PSAs vested (0.3 ) 22.52 RSUs canceled (1.9 ) 22.09 PSAs canceled (1.0 ) 22.28 Balance as of September 30, 2015 19.6 $ 22.15 1.2 $ 504.4 ________________________________ (1) Includes service-based and market-based RSUs granted under the 2015 Plan and the 2006 Plan according to its terms. (2) The number of shares subject to PSAs granted represents the aggregate maximum number of shares that may be issued pursuant to the award over its full term. The aggregate number of shares subject to these PSAs that would be issued if performance goals determined by the Compensation Committee are achieved at target is 0.5 million shares. Depending on achievement of such performance goals, the range of shares that could be issued under these awards is 0 to 0.8 million shares. (3) The grant date fair value of RSUs and PSAs were reduced by the present value of dividends expected to be paid on the underlying shares of common stock during the requisite and derived service period as these awards are not entitled to receive dividends until vested. On July 23, 2015, the Company declared a cash dividend of $0.10 per share of common stock, or $38.5 million in the aggregate, to stockholders of record on September 1, 2015, which was paid on September 22, 2015.
Estimates of weighted average fair value per share under employee purchase plan and stock option plan	The weighted-average assumptions used and the resulting estimates of fair value for ESPP and market-based RSUs during the three and nine months ended September 30, 2015 and September 30, 2014 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 ESPP (1) : Volatility 26% 27% 29% 30% Risk-free interest rate 0.2% 0.1% 0.1% 0.1% Expected life (years) 0.5 0.5 0.5 0.5 Dividend yield 1.4% 1.8% 1.7% 1.0% Weighted-average fair value per share $6.20 $5.13 $5.63 $5.72 Market-based RSUs (2) : Volatility — — 34% 36% Risk-free interest rate — — 1.4% 1.6% Dividend yield — — 1.8% 0% - 1.5% Weighted-average fair value per share — — $14.97 $18.28 ________________________________ (1) The Black-Scholes-Merton option-pricing model is utilized to estimate the fair value of shares issuable under the ESPP. (2) The fair value of market-based RSUs utilizes a Monte Carlo valuation methodology. The Company amortizes the fair value of these awards over the derived service period adjusted for estimated forfeitures for each separately vesting tranche of the award. Provided that the derived service is rendered, the total fair value of the market-based RSUs at the date of grant is recognized as compensation expense even if the market condition is not achieved. However, the number of shares that ultimately vest can vary significantly with the performance of the specified market criteria.
Schedule of employee service share-based compensation, allocation of recognized period costs	Share-based compensation expense associated with stock options, RSUs, RSAs, PSAs, and ESPP was recorded in the following cost and expense categories in the Condensed Consolidated Statements of Operations (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost of revenues - Product $ 1.3 $ 1.3 $ 4.5 $ 3.9 Cost of revenues - Service 3.2 3.6 10.4 10.7 Research and development 31.0 37.1 94.1 100.8 Sales and marketing 13.0 15.9 32.2 44.9 General and administrative 8.0 7.4 20.1 25.1 Total $ 56.5 $ 65.3 $ 161.3 $ 185.4
Disclosure of share-based compensation arrangements by share-based payment award	The following table summarizes share-based compensation expense by award type (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Stock options $ 1.5 $ 3.2 $ 5.2 $ 12.0 RSUs, RSAs, and PSAs 52.4 58.2 146.3 161.9 ESPP 2.6 3.9 9.8 11.5 Total $ 56.5 $ 65.3 $ 161.3 $ 185.4
Schedule of unrecognized compensation cost, nonvested awards	The following table presents unrecognized compensation cost, adjusted for estimated forfeitures, recognized over a weighted-average period related to unvested stock options, RSUs, RSAs, and PSAs as of September 30, 2015 (in millions, except years): Unrecognized Compensation Cost Weighted Average Period (In Years) Stock options $ 3.8 0.8 RSUs, RSAs, and PSAs $ 241.9 1.8

Segments (Tables)

Segments (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Financial information for each segment	The following table presents net revenues by product and service (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Routing $ 604.4 $ 533.2 $ 1,711.6 $ 1,700.8 Switching 201.4 155.0 558.1 546.8 Security 119.6 121.3 319.5 367.1 Total product 925.4 809.5 2,589.2 2,614.7 Total service 323.2 316.4 949.0 910.8 Total $ 1,248.6 $ 1,125.9 $ 3,538.2 $ 3,525.5
Net revenues by geographic region	The Company attributes revenues to geographic region based on the customer’s ship-to location. The following table presents net revenues by geographic region (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Americas: United States $ 665.6 $ 621.3 $ 1,869.7 $ 1,905.7 Other 47.2 57.0 167.9 165.1 Total Americas 712.8 678.3 2,037.6 2,070.8 Europe, Middle East, and Africa 355.0 290.5 975.1 911.0 Asia Pacific 180.8 157.1 525.5 543.7 Total $ 1,248.6 $ 1,125.9 $ 3,538.2 $ 3,525.5
Long-lived Assets by Geographic Areas	The following table presents geographic information for property and equipment, net and purchased intangible assets, net (in millions): As of September 30, December 31, United States $ 879.1 $ 871.7 International 120.0 95.0 Property and equipment, net and purchased intangible assets, net $ 999.1 $ 966.7

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Schedule of effective income tax rate reconciliation	The effective tax rates for the three and nine months ended September 30, 2015 and September 30, 2014 include the tax expense (benefit) of the following discrete items (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Cost-sharing adjustment (1) $ (13.2 ) $ — $ (13.2 ) $ — Tax on equity investments (2) $ — $ 0.7 $ — $ 36.3 Restructuring $ — $ 9.2 $ — $ (46.7 ) Legal settlement $ — $ — $ — $ 44.7 ________________________________ (1) Represents cumulative impact through fiscal year 2014 for the change in treatment of share-based compensation as a result of the U.S. Tax Court decision in Altera (see further explanation below). The total net benefit to the Condensed Consolidated Statements of Operations including the nine months ended September 30, 2015 was approximately $18.0 million . (2) During the nine months ended September 30, 2014 , tax on equity investments of $36.3 million is net of a valuation allowance release of $24.7 million .

Net Income Per Share (Tables)

Net Income Per Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Schedule of earnings per share, basic and diluted	The Company computed basic and diluted net income per share attributable to Juniper Networks common stockholders as follows (in millions, except per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2015 2014 2015 2014 Numerator: Net income $ 197.7 $ 103.6 $ 435.9 $ 435.3 Denominator: Weighted-average shares used to compute basic net income per share 382.8 448.4 393.2 468.1 Dilutive effect of employee stock awards 6.4 6.4 8.0 8.9 Weighted-average shares used to compute diluted net income per share 389.2 454.8 401.2 477.0 Net income per share attributable to Juniper Networks common stockholders: Basic $ 0.52 $ 0.23 $ 1.11 $ 0.93 Diluted $ 0.51 $ 0.23 $ 1.09 $ 0.91 Anti-dilutive: Potential anti-dilutive shares 3.1 10.2 3.7 10.8

Summary of Significant Accoun37

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	Mar. 31, 2016	Sep. 30, 2015
Adjustments for new accounting pronouncements [Line Items]
Expected reduction in debt liabilities		$ (1,948.6)
Scenario, Forecast [Member] | ASU No. 2015-03 [Member]
Adjustments for new accounting pronouncements [Line Items]
Expected reduction in debt issuance cost asset	$ 11
Expected reduction in debt liabilities	$ 11

Cash Equivalents and Investme38

Cash Equivalents and Investments - Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale securities:
Available-for-sale securities, amortized cost	$ 1,976.8	$ 2,071.9
Available-for-sale securities, gross unrealized gains	1.9	0.6
Available-for-sale securities, gross unrealized losses	(2.2)	(1.7)
Available-for-sale securities, estimated fair value	1,976.5	2,070.8
Trading securities:
Trading securities, amortized cost	16.8	16.3
Trading securities, gross unrealized gains	0	0
Trading securities, gross unrealized losses	0	0
Trading securities, estimated fair value	16.8	16.3
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	1,993.6	2,088.2
Total investments, gross unrealized gains	1.9	0.6
Total investments, gross unrealized losses	(2.2)	(1.7)
Total investments, estimated fair value	1,993.3	2,087.1
Cash equivalents [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	166.3	576.6
Total investments, gross unrealized gains	0	0
Total investments, gross unrealized losses	0	0
Total investments, estimated fair value	166.3	576.6
Restricted investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	33.4	45.2
Total investments, gross unrealized gains	0.1	0
Total investments, gross unrealized losses	0	0
Total investments, estimated fair value	33.5	45.2
Short-term investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	529.1	332.2
Total investments, gross unrealized gains	0.9	0.2
Total investments, gross unrealized losses	(0.1)	(0.2)
Total investments, estimated fair value	529.9	332.2
Long-term investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	1,264.8	1,134.2
Total investments, gross unrealized gains	0.9	0.4
Total investments, gross unrealized losses	(2.1)	(1.5)
Total investments, estimated fair value	1,263.6	1,133.1
Debt Securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	1,769.1	1,471.7
Available-for-sale securities, gross unrealized gains	1.1	0.5
Available-for-sale securities, gross unrealized losses	(2.2)	(1.6)
Available-for-sale securities, estimated fair value	1,768	1,470.6
Asset-backed securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	324.2	269.3
Available-for-sale securities, gross unrealized gains	0.1	0
Available-for-sale securities, gross unrealized losses	(0.2)	(0.3)
Available-for-sale securities, estimated fair value	324.1	269
Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	3.8	10.6
Available-for-sale securities, gross unrealized gains	0	0
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	3.8	10.6
Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	9.4	20.3
Available-for-sale securities, gross unrealized gains	0	0
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	9.4	20.3
Corporate debt securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	935.8	738.6
Available-for-sale securities, gross unrealized gains	0.7	0.5
Available-for-sale securities, gross unrealized losses	(1.9)	(1.1)
Available-for-sale securities, estimated fair value	934.6	738
Foreign government debt securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	16.5	24.6
Available-for-sale securities, gross unrealized gains	0	0
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	16.5	24.6
Government-sponsored enterprise obligations [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	214.1	162.2
Available-for-sale securities, gross unrealized gains	0.1	0
Available-for-sale securities, gross unrealized losses	0	(0.1)
Available-for-sale securities, estimated fair value	214.2	162.1
US government securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	265.3	246.1
Available-for-sale securities, gross unrealized gains	0.2	0
Available-for-sale securities, gross unrealized losses	(0.1)	(0.1)
Available-for-sale securities, estimated fair value	265.4	246
Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	196	594.2
Available-for-sale securities, gross unrealized gains	0	0
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	196	594.2
Mutual funds [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	3.7	3.9
Available-for-sale securities, gross unrealized gains	0.1	0.1
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	3.8	4
Publicly-traded equity securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	8	2.1
Available-for-sale securities, gross unrealized gains	0.7	0
Available-for-sale securities, gross unrealized losses	0	(0.1)
Available-for-sale securities, estimated fair value	$ 8.7	$ 2

Cash Equivalents and Investme39

Cash Equivalents and Investments - Maturities of Fixed Income Investments (Details) $ in Millions	Sep. 30, 2015USD ($)
Schedule of Fixed Income Securities Maturities [Abstract]
Amortized cost due within one year	$ 504.2
Gross unrealized gains due within one year	0.3
Gross unrealized losses due within one year	(0.1)
Estimated fair value due within one year	504.4
Amortized cost due between one and five years	1,264.9
Gross unrealized gains due between one and five years	0.8
Gross unrealized losses due between one and five year	(2.1)
Estimated fair value due between one and five year	1,263.6
Total investments, amortized cost	1,769.1
Gross Unrealized Gains	1.1
Gross Unrealized Losses	(2.2)
Total investments, estimated fair value	$ 1,768

Cash Equivalents, and Investmen

Cash Equivalents, and Investments, Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)Investment	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)Investment	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)Investment
Cash Equivalents and Investments [Abstract]
Total investments in unrealized loss position | Investment	440		440		437
Available-for-sale securities, other than temporary impairment	$ 0	$ 1.1	$ 0	$ 2.7
Available-for-sale securities, gross realized gains				166.3
Privately-held investments	91.3		91.3		$ 89.9
Privately held investments at fair value	48.9		48.9		$ 47.5
Unrealized gain (loss) on privately-held debt securities	0	0	0	10
Other than temporary impairment of privately-held investments	$ 0	$ 1.1	$ 0	$ 1.1

Cash Equivalents and Investme41

Cash Equivalents and Investments - Unrealized Loss on Available-for-Sale Securities (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	$ 885.3	$ 1,067.2
Unrealized loss, less than 12 months	(2.1)	(1.7)
Fair value, 12 months or greater	51.7	0
Unrealized loss, 12 months or greater	(0.1)	0
Total fair value, available-for-sale investments in continuous unrealized loss position	937	1,067.2
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(2.2)	(1.7)
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	885.3	1,065.2
Unrealized loss, less than 12 months	(2.1)	(1.6)
Fair value, 12 months or greater	51.7	0
Unrealized loss, 12 months or greater	(0.1)	0
Total fair value, available-for-sale investments in continuous unrealized loss position	937	1,065.2
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(2.2)	(1.6)
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	188.5	221.9
Unrealized loss, less than 12 months	(0.2)	(0.3)
Fair value, 12 months or greater	34.2	0
Unrealized loss, 12 months or greater	0	0
Total fair value, available-for-sale investments in continuous unrealized loss position	222.7	221.9
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(0.2)	(0.3)
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	522	515.9
Unrealized loss, less than 12 months	(1.8)	(1.1)
Fair value, 12 months or greater	17.5	0
Unrealized loss, 12 months or greater	(0.1)	0
Total fair value, available-for-sale investments in continuous unrealized loss position	539.5	515.9
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(1.9)	(1.1)
Foreign government debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	13.5	24.6
Unrealized loss, less than 12 months	0	0
Fair value, 12 months or greater	0	0
Unrealized loss, 12 months or greater	0	0
Total fair value, available-for-sale investments in continuous unrealized loss position	13.5	24.6
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	0
Government-sponsored enterprise obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	41.8	113.8
Unrealized loss, less than 12 months	0	(0.1)
Fair value, 12 months or greater	0	0
Unrealized loss, 12 months or greater	0	0
Total fair value, available-for-sale investments in continuous unrealized loss position	41.8	113.8
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	(0.1)
US government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	119.5	189
Unrealized loss, less than 12 months	(0.1)	(0.1)
Fair value, 12 months or greater	0	0
Unrealized loss, 12 months or greater	0	0
Total fair value, available-for-sale investments in continuous unrealized loss position	119.5	189
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	$ (0.1)	(0.1)
Publicly-traded equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months		2
Unrealized loss, less than 12 months		(0.1)
Fair value, 12 months or greater		0
Unrealized loss, 12 months or greater		0
Total fair value, available-for-sale investments in continuous unrealized loss position		2
Total unrealized loss, available-for-sale investments in continuous unrealized loss position		$ (0.1)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Available-for-sale securities:
Available-for-sale securities	$ 1,976.5	$ 1,976.5	$ 2,070.8
Trading securities:
Trading securities	16.8	16.8	16.3
Fair Value Measurements (Textuals)
Restricted investments	29.7	29.7	41.3
Asset-backed Securities [Member]
Available-for-sale securities:
Available-for-sale securities	324.1	324.1	269
Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	10.6
Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities	9.4	9.4	20.3
Corporate debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	934.6	934.6	738
Foreign government debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	16.5	16.5	24.6
Government-sponsored enterprise obligations [Member]
Available-for-sale securities:
Available-for-sale securities	214.2	214.2	162.1
Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities	196	196	594.2
Mutual funds [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	4
Publicly-traded equity securities [Member]
Available-for-sale securities:
Available-for-sale securities	8.7	8.7	2
US government securities [Member]
Available-for-sale securities:
Available-for-sale securities	265.4	265.4	246
Privately-held debt and redeemable preferred stock securities [Member]
Available-for-sale securities:
Available-for-sale securities	1,768	1,768	1,470.6
Fair Value, Measurements, Recurring [Member]
Derivative assets:
Total assets measured at fair value	2,042.8	2,042.8	2,134.7
Liabilities measured at fair value:
Other accrued liabilities	(1.3)	(1.3)	(3.9)
Total liabilities measured at fair value	(1.3)	(1.3)	(3.9)
Cash equivalents	166.3	166.3	576.6
Restricted investments	33.5	33.5	45.2
Short-term investments	529.9	529.9	332.2
Long-term investments	1,263.6	1,263.6	1,133.1
Prepaid expenses and other current assets	0.6	0.6	0.1
Other long-term assets	48.9	48.9	47.5
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]
Derivative assets:
Foreign exchange contracts	0.6	0.6	0.1
Liabilities measured at fair value:
Derivative liabilities	(1.3)	(1.3)	(3.9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative assets:
Total assets measured at fair value	490.7	490.7	862.5
Liabilities measured at fair value:
Other accrued liabilities	0	0	0
Total liabilities measured at fair value	0	0	0
Cash equivalents	166.3	166.3	552.9
Restricted investments	33.5	33.5	45.2
Short-term investments	135.1	135.1	87
Long-term investments	155.8	155.8	177.4
Prepaid expenses and other current assets	0	0	0
Other long-term assets	0	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign exchange contract [Member]
Derivative assets:
Foreign exchange contracts	0	0	0
Liabilities measured at fair value:
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Derivative assets:
Total assets measured at fair value	1,503.2	1,503.2	1,224.7
Liabilities measured at fair value:
Other accrued liabilities	(1.3)	(1.3)	(3.9)
Total liabilities measured at fair value	(1.3)	(1.3)	(3.9)
Cash equivalents	0	0	23.7
Restricted investments	0	0	0
Short-term investments	394.8	394.8	245.2
Long-term investments	1,107.8	1,107.8	955.7
Prepaid expenses and other current assets	0.6	0.6	0.1
Other long-term assets	0	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign exchange contract [Member]
Derivative assets:
Foreign exchange contracts	0.6	0.6	0.1
Liabilities measured at fair value:
Derivative liabilities	(1.3)	(1.3)	(3.9)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative assets:
Total assets measured at fair value	48.9	48.9	47.5
Liabilities measured at fair value:
Other accrued liabilities	0	0	0
Total liabilities measured at fair value	0	0	0
Cash equivalents	0	0	0
Restricted investments	0	0	0
Short-term investments	0	0	0
Long-term investments	0	0	0
Prepaid expenses and other current assets	0	0	0
Other long-term assets	48.9	48.9	47.5
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign exchange contract [Member]
Derivative assets:
Foreign exchange contracts	0	0	0
Liabilities measured at fair value:
Derivative liabilities	0	0	0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]
Available-for-sale securities:
Available-for-sale securities	324.1	324.1	269
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	324.1	324.1	269
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	10.6
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	10.6
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities	9.4	9.4	20.3
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	9.4	9.4	20.3
Fair Value, Measurements, Recurring [Member] | Commercial paper [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	934.6	934.6	738
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	934.6	934.6	738
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	16.5	16.5	24.6
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	16.5	16.5	24.6
Fair Value, Measurements, Recurring [Member] | Foreign government debt securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member]
Available-for-sale securities:
Available-for-sale securities	214.2	214.2	162.1
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	214.2	214.2	162.1
Fair Value, Measurements, Recurring [Member] | Government-sponsored enterprise obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities	196	196	594.2
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	196	196	594.2
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	4
Trading securities:
Trading securities	16.8	16.8	16.3
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	3.8	3.8	4
Trading securities:
Trading securities	16.8	16.8	16.3
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Trading securities:
Trading securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Trading securities:
Trading securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member]
Available-for-sale securities:
Available-for-sale securities	8.7	8.7	2
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	8.7	8.7	2
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | US government securities [Member]
Available-for-sale securities:
Available-for-sale securities	265.4	265.4	246
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	265.4	265.4	246
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member]
Available-for-sale securities:
Available-for-sale securities	1,976.5	1,976.5	2,070.8
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	473.9	473.9	846.2
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	1,502.6	1,502.6	1,224.6
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available-for-sale securities:
Available-for-sale securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member]
Trading securities:
Privately-held debt and redeemable preferred stock securities	48.9	48.9	47.5
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 1 [Member]
Trading securities:
Privately-held debt and redeemable preferred stock securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 2 [Member]
Trading securities:
Privately-held debt and redeemable preferred stock securities	0	0	0
Fair Value, Measurements, Recurring [Member] | Privately-held debt and redeemable preferred stock securities [Member] | Fair Value, Inputs, Level 3 [Member]
Trading securities:
Privately-held debt and redeemable preferred stock securities	48.9	48.9	$ 47.5
Fair Value Measurements (Textuals)
Purchases of privately-held investments	$ 2.2	$ 5

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Security [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment loss			$ 850
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable, fair value	$ 125	$ 125	125
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term and Long-term debt, fair value	1,976	1,976	$ 1,395.2
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Purchases of privately-held investments	$ 2.2	$ 5

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 172.2	$ 238.7
Cash flow hedges [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	116.3	160.7
Non-designated derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 55.9	$ 78

Derivative Instruments, Cash Fl

Derivative Instruments, Cash Flow Hedges and Offsetting of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Maximum length of time hedged in cash flow hedge			1 year
Foreign exchange contract [Member] | Cash flow hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), Effective portion	$ (1.9)	$ (2.8)	$ (5.2)	$ 1.7
Foreign exchange contract [Member] | Cash flow hedging [Member] | Operating expense [Member]
Derivatives, Fair Value [Line Items]
Derivative instruments, gain (loss) reclassified from accumulated OCI into operating expense, Effective portion	$ (1.9)	$ 1.5	$ (8.7)	$ 5

Derivative Instruments, Non-Des

Derivative Instruments, Non-Designated Hedges (Details) - Foreign exchange contract [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Maturity period of non designated hedges derivatives			2 months
Other income (expense), net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) on non-designated derivative instruments	$ (0.1)	$ (0.3)	$ (0.4)	$ (3.3)

Goodwill and Purchased Intang47

Goodwill and Purchased Intangible Assets, Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2014	$ 2,981.5
Other	(0.2)
Balance as of September 30, 2015	$ 2,981.3

Goodwill and Purchased Intang48

Goodwill and Purchased Intangible Assets, Purchased Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 39.2
Total purchased intangible assets, gross	646.9	$ 646.9
Total purchased intangible assets, accumulated amortization	(555)	(531.8)
Total purchased intangible assets, impairments and other charges	(52.7)	(52.7)
Total purchased intangible assets, net	39.2	62.4
Technologies and patents [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	567.7	567.7
Finite-lived intangible assets, accumulated amortization	(487.2)	(466.1)
Finite-lived intangible assets, impairments and other charges	(49.9)	(49.9)
Finite-lived intangible assets, net	30.6	51.7
Customer contracts, support agreements, and related relationships [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	78.1	78.1
Finite-lived intangible assets, accumulated amortization	(67.2)	(65.2)
Finite-lived intangible assets, impairments and other charges	(2.8)	(2.8)
Finite-lived intangible assets, net	8.1	10.1
Other intangible assets [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	1.1	1.1
Finite-lived intangible assets, accumulated amortization	(0.6)	(0.5)
Finite-lived intangible assets, impairments and other charges	0	0
Finite-lived intangible assets, net	$ 0.5	$ 0.6

Goodwill and Purchased Intang49

Goodwill and Purchased Intangible Assets, Finite Lived Intangible Assets by Class (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 5.6	$ 8.5	$ 23.2	$ 27.8
Acceleration of the end of life of certain intangible assets, finite-lived	0	0	5.6	0
Cost of Revenues [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	4.7	7.1	20.2	23.7
Sales and Marketing Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	0.7	1.1	2.1	3.2
General and Administrative Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	0.2	0.3	0.9	0.9
Operating expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 0.9	$ 1.4	$ 3	$ 4.1

Goodwill and Purchased Intang50

Goodwill and Purchased Intangible Assets, Estimated Future Amortization Expense Intangible Assets (Details) $ in Millions	Sep. 30, 2015USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2015	$ 5.3
2,016	11.6
2,017	7
2,018	5.1
2,019	4.9
Thereafter	5.3
Finite-lived intangible assets, net	$ 39.2

Other Financial Information, In

Other Financial Information, Inventories, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Other Financial Information [Abstract]
Production materials	$ 45.2		$ 45.2		$ 38.3
Finished goods	27.1		27.1		24.2
Inventories	72.3		72.3		$ 62.5
Restructuring charges			(4)
Restructuring Plan 2014 [Member] | Inventory Write-down [Member]
Restructuring charges	$ 0	$ 0	$ 0	$ 15.5

Other Financial Information, Ot

Other Financial Information, Other Long Term Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	18 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Apr. 01, 2017	Dec. 31, 2014	Oct. 01, 2014
Other Financial Information [Line Items]
Privately-held investments	$ 91.3	$ 91.3		$ 89.9
Licensed software	7.7	7.7		8.6
Federal income tax receivable	28.9	28.9		20
Customer financing receivable	1.5	1.5		16.9
Inventory	8.7	8.7		8
Prepaid costs, deposits, and other	60.5	60.5		35.5
Promissory note in connection with the sale of Junos Pulse	125	125		125
Interest Receivable	6.3	6.3		0
Other long-term assets	329.9	329.9		$ 303.9
Scheduled interest payments not received	3.1	3.1
Interest income	$ 1.6	$ 4.7
Junos Pulse [Member]
Other Financial Information [Line Items]
Promissory note in connection with the sale of Junos Pulse					$ 125
Consideration					230.7
Cash Consideration					105.7
Working capital adjustment					$ 19.3
Junos Pulse [Member] | Scenario, Forecast [Member] | Subsequent Event [Member]
Other Financial Information [Line Items]
Required minimum payment due on notes receivable			$ 75

Other Financial Information, Wa

Other Financial Information, Warranties (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of December 31, 2014	$ 28.7
Provisions made during the period	20.8
Adjustments related to pre-existing warranties	(21.2)
Balance as of September 30, 2015	$ 28.3

Other Financial Information, De

Other Financial Information, Deferred Revenue (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Deferred revenue:
Total deferred revenue	$ 1,124.9	$ 1,075.7
Reported as:
Current	814.4	780.8
Long-term	310.5	294.9
Total deferred revenue	1,124.9	1,075.7
Sales Revenue, Product, Net [Member]
Deferred revenue:
Undelivered product commitments and other product deferrals	221.7	180.3
Distributor inventory and other sell-through items	63.1	103.7
Deferred gross product revenue	284.8	284
Deferred cost of product revenue	(43.7)	(58.4)
Total deferred revenue	241.1	225.6
Reported as:
Total deferred revenue	241.1	225.6
Sales Revenue, Service, Net [Member]
Deferred revenue:
Total deferred revenue	883.8	850.1
Reported as:
Total deferred revenue	$ 883.8	$ 850.1

Other Financial Information, 55

Other Financial Information, Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other Financial Information [Abstract]
Interest income	$ 5.7	$ 2.7	$ 16.3	$ 6.9
Interest expense	(21.6)	(16.9)	(61.9)	(50.2)
Net gain on legal settlement	0	0.8	0	196.1
Gain (loss) on investments	6	(1.9)	6.8	165.1
Other	1.5	8.5	(2.5)	8.1
Other (expense) income, net	(8.4)	(6.8)	(41.3)	326
Gain Contingencies [Line Items]
Publicly-traded equity and privately-held investments, net realized gain				163
Net gain on legal settlement	0	0.8	0	196.1
Gain (loss) on sale of securities		$ 0.8
Cost-method investments, realized gain (loss)	$ 6		$ 6
Palo Alto Networks [Member]
Other Financial Information [Abstract]
Net gain on legal settlement				196.1
Gain Contingencies [Line Items]
Net gain on legal settlement				196.1
Proceeds from legal settlements				$ 75

Restructuring and Other Charg56

Restructuring and Other Charges (Details) ft² in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)ft²right	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)right
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	$ (3.5)	$ (15)	$ (4)	$ 179.4
Restructuring charges			(4)
Area subject to Restructuring Activities | ft²		0.4
Area subject to Sublease | ft²		0.1
Duration of sublease		2 years
Renewal Rights | right		1		1
Duration of renewal period		6 months
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period			17
Charges			(4)
Cash Payments			(10.3)
Non-cash Settlements and Other			0.8
Restructuring reserve, end of period	3.5		3.5
Restructuring reserve	3.5		17
Cost of Revenues [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	(3.5)	$ 0	(3.5)	$ 22.2
Restructuring and other (benefits) charges [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	0	(15)	(0.5)	157.2
Severance [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	0	7.1	0.4	45.6
Restructuring charges			0.4
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period			9.4
Charges			0.4
Cash Payments			(8)
Non-cash Settlements and Other			(1.8)
Restructuring reserve, end of period	0		0
Restructuring reserve	0		9.4
Severance [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges		7.1	0.4	45
Restructuring Reserve [Roll Forward]
Charges		7.1	0.4	45
Facilities [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	0	(25)	(0.9)	12.8
Restructuring charges			(0.9)
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period			7.4
Charges			(0.9)
Cash Payments			(2.3)
Non-cash Settlements and Other			(0.7)
Restructuring reserve, end of period	3.5		3.5
Restructuring reserve	3.5		7.4
Facilities [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges		(25)	(0.9)	12.6
Amount paid to Landlord		12.3
Transaction Fees		5.3
Restructuring Reserve [Roll Forward]
Charges		(25)	(0.9)	12.6
Impairment charges related to licensed software [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges				84.7
Restructuring Reserve [Roll Forward]
Charges				84.7
Contract terminations [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	0	0	0	2.3
Restructuring charges			(3.5)
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning of period			0.2
Charges			(3.5)
Cash Payments			0
Non-cash Settlements and Other			3.3
Restructuring reserve, end of period	0		0
Restructuring reserve	0		0.2
Contract terminations [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges				2.3
Restructuring Reserve [Roll Forward]
Charges				2.3
Asset impairment and write-downs [Member]
Restructuring Reserve [Line Items]
Restructuring and other (benefits) charges	(3.5)	2.9	(3.5)	118.7
Asset impairment and write-downs [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges				0.8
Restructuring Reserve [Roll Forward]
Charges				0.8
Acceleration of Certain End of Life Products [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges	(3.5)			6.7
Restructuring Reserve [Roll Forward]
Charges	(3.5)			6.7
Asset Write-Down [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges		2.9		11.8
Restructuring Reserve [Roll Forward]
Charges		2.9		11.8
Inventory Write-down [Member] | Restructuring Plan 2014 [Member]
Restructuring Reserve [Line Items]
Restructuring charges	0	0	0	15.5
Restructuring Reserve [Roll Forward]
Charges	$ 0	$ 0	$ 0	$ 15.5

Debt and Financing (Details)

Debt and Financing (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Mar. 31, 2011
Debt [Line Items]
Total senior notes	$ 1,950		$ 1,950
Unaccreted discount	(1.4)		(1.4)
Short-term and Long-term debt, net of discount	1,948.6		1,948.6
Short-term debt	299.9		299.9			$ 0
Long-term debt	$ 1,648.7		$ 1,648.7			1,349
Redemption percent due to change in control	101.00%		101.00%
Financing Arrangements [Abstract]
Sale of receivable	$ 11.4	$ 92.8	$ 69.9	$ 429.2
Proceeds from sale and collection of receivables	9.1	$ 128.9	94.6	$ 473.3
Receivables from sale of receivables	3.7		$ 3.7			28
Maximum term for guarantees related to third-party financing arrangements			4 years
Cash received from financing provider that has not been recognized as revenue	16.8		$ 16.8			$ 67.5
Financing guarantee with recourse [Member]
Financing Arrangements [Abstract]
Guarantor obligations, current carrying value	11.2		$ 11.2
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]
Debt [Line Items]
Short-term debt, gross	$ 300		$ 300					$ 300
Effective interest rate	3.25%		3.25%
Long-term debt, stated interest rate	3.10%		3.10%					3.10%
Fixed rate note due 2020 [Member]
Debt [Line Items]
Long-term debt, gross	$ 300		$ 300		$ 300
Effective interest rate	3.47%		3.47%
Long-term debt, stated interest rate	3.30%		3.30%		3.30%
Redemption period			1 month
Fixed rate note due 2020 [Member] | One Month Prior to Maturity [Member]
Debt [Line Items]
Redemption price			100.00%
Fixed rate note due 2020 [Member] | Three Months Prior to Maturity [Member] | Treasury Rate [Member]
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]
Debt [Line Items]
Redemption price			100.00%
Fixed rate note due 2021 [Member]
Debt [Line Items]
Long-term debt, gross	$ 300		$ 300					$ 300
Effective interest rate	4.69%		4.69%
Long-term debt, stated interest rate	4.60%		4.60%					4.60%
Fixed rate note due 2024 [Member]
Debt [Line Items]
Long-term debt, gross	$ 350		$ 350				$ 350
Effective interest rate	4.63%		4.63%
Long-term debt, stated interest rate	4.50%		4.50%				4.50%
Fixed rate note due 2025 [Member]
Debt [Line Items]
Long-term debt, gross	$ 300		$ 300		$ 300
Effective interest rate	4.47%		4.47%
Long-term debt, stated interest rate	4.35%		4.35%		4.35%
Redemption period			3 months
Fixed rate note due 2025 [Member] | One Month Prior to Maturity [Member] | Treasury Rate [Member]
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]
Debt [Line Items]
Redemption price			100.00%
Fixed rate note due 2025 [Member] | On or After March 15, 2025 [Member]
Debt [Line Items]
Redemption price			100.00%
Fixed rate note due 2041 [Member]
Debt [Line Items]
Long-term debt, gross	$ 400		$ 400					$ 400
Effective interest rate	6.03%		6.03%
Long-term debt, stated interest rate	5.95%		5.95%					5.95%
Other Fixed Rate Notes [Member]
Debt [Line Items]
Redemption price			100.00%

Debt and Financing Revolving Cr

Debt and Financing Revolving Credit Facility (Details) - Revolving Credit Facility [Member]	Jun. 27, 2014USD ($)
Line of Credit Facility [Line Items]
Revolving credit facility limit	$ 500,000,000
Revolving credit facility, additional borrowing capacity	$ 200,000,000
Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Eurodollar [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.90%
Eurodollar [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
ICE Benchmark Administration Settlement Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%

Equity, Cash Dividends on Share

Equity, Cash Dividends on Shares of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 22, 2015	Jul. 23, 2015	Apr. 23, 2015	Jan. 27, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stockholders' Equity Note [Abstract]
Cash dividends declared per common stock (in dollar per share)		$ 0.10	$ 0.1	$ 0.1	$ 0.10	$ 0.10	$ 0.3	$ 0.10
Common stock dividends paid	$ 38.5						$ 118

Equity, Stock Repurchase Activi

Equity, Stock Repurchase Activities (Details) $ / shares in Units, shares in Millions	Jul. 23, 2015$ / shares	Apr. 23, 2015$ / shares	Jan. 27, 2015$ / shares	Jul. 23, 2014USD ($)$ / sharesshares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)$ / sharesshares	Mar. 31, 2014USD ($)shares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)agreementinstitution$ / shares	Jul. 31, 2015USD ($)	Oct. 31, 2014USD ($)	Feb. 28, 2014USD ($)
Accelerated Share Repurchases [Line Items]
Cash dividends declared per common stock (in dollar per share) | $ / shares	$ 0.10	$ 0.1	$ 0.1		$ 0.10	$ 0.10		$ 0.3	$ 0.10
Common stock repurchased under stock repurchase program average purchase price (in dollars per share) | $ / shares					$ 28.01	$ 23.44		$ 24.78
Stock repurchase program, authorized amount												$ 2,100,000,000
Stock repurchased and retired | shares					1.8	23.5		42.4
Common stock repurchased and retired under stock repurchase program, value					$ 50,000,000	$ 550,000,000	$ 900,000,000	$ 1,100,000,000
Number of accelerated share repurchase agreements | agreement									2
Number of financial institutions for ASR | institution									2
Accelerated share repurchases, aggregate payments made during period							$ 1,200,000,000
Additional shares repurchased under ASR | shares				16
Total accelerated share repurchases, shares repurchased | shares				49.3
Accelerated share repurchases, weighted average repurchase price (in USD per share) | $ / shares				$ 24.35
2014 Stock Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Stock repurchase program, remaining authorized repurchase amount					$ 625,000,000			$ 625,000,000
Stock repurchase program, authorized amount						$ 1,200,000,000			$ 1,200,000,000	$ 3,900,000,000		$ 1,200,000,000
Additional amount authorized under Stock Repurchase Plan										$ 500,000,000	$ 1,300,000,000
Stock repurchased and retired | shares							33.3
Accelerated share repurchases, remaining amount recorded in equity				$ 300,000,000

Equity, Components of Accumulat

Equity, Components of Accumulated Other Comprehensive (Loss) Income, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2014			$ (13.8)
Other comprehensive gain (loss) before reclassifications			(13.7)
Amount reclassified from accumulated other comprehensive income			8.1
Other comprehensive loss, net of tax	$ (12.1)	$ (16.1)	(5.6)	$ (67.6)
Balance as of September 30, 2015	(19.4)		(19.4)
Cost of revenues	451.2	411.1	1,302	1,342.4
Sales and marketing	235.3	249.2	687.9	780.6
General and administrative	57.1	55	168.6	190.5
Research and development expense	247	$ 253.2	747.3	$ 772.7
Unrealized Gains (Losses) on Available-for- Sale Securities
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2014			8.4
Other comprehensive gain (loss) before reclassifications			4.6
Amount reclassified from accumulated other comprehensive income			(0.6)
Other comprehensive loss, net of tax			4
Balance as of September 30, 2015	12.4		12.4
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2014			(4.2)
Other comprehensive gain (loss) before reclassifications			(5.4)
Amount reclassified from accumulated other comprehensive income			8.7
Other comprehensive loss, net of tax			3.3
Balance as of September 30, 2015	(0.9)		(0.9)
Cost of revenues			2.6
Sales and marketing			5.5
General and administrative			0.5
Research and development expense			0.1
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2014			(18)
Other comprehensive gain (loss) before reclassifications			(12.9)
Amount reclassified from accumulated other comprehensive income			0
Other comprehensive loss, net of tax			(12.9)
Balance as of September 30, 2015	$ (30.9)		$ (30.9)

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	May. 19, 2015	Dec. 31, 2014
Share-Based Compensation Plans
Common stock, shares, issued	384,800,000	384,800,000		416,200,000
Outstanding stock options, restricted stock units, and restricted stock awards from awards assumed	2,300,000	2,300,000
Number of Shares
Balance as of December 31, 2014 (in shares)		9,900,000
Canceled (in shares)		(100,000)
Exercised (in shares)		(2,400,000)
Expired (in shares)		(2,600,000)
Balance as of September 30, 2015 (in shares)	4,800,000	4,800,000
Weighted Average Exercise Price per Share
Balance as of December 31, 2014 (in dollars per share)		$ 24.87
Canceled (in dollars per share)		23.65
Exercised (in dollars per share)		19.10
Expired (in dollars per share)		27.91
Balance as of September 30, 2015 (in dollars per share)	$ 26.07	$ 26.07
Weighted average remaining contractual term at September 30, 2015		2 years 1 month 6 days
Aggregate intrinsic value at September 30, 2015	$ 20,300,000	$ 20,300,000
Vested or expected-to-vest options at September 30, 2015 (in shares)	4,800,000	4,800,000
Vested or expected-to-vest options, weighted average exercise price at September 30, 2015 (in dollars per share)	$ 26.16	$ 26.16
Vested and expected-to-vest options, weighted average remaining contractual term at September 30, 2015		2 years
Vested or expected-to-vest options, aggregate intrinsic value at September 30, 2015	$ 19,900,000	$ 19,900,000
Exercisable options at September 30, 2015 (in shares)	4,500,000	4,500,000
Exercisable options, weighted average exercise price at September 30, 2015 (in dollars per share)	$ 27.35	$ 27.35
Exercisable options, weighted average remaining contractual term at September 30, 2015		1 year 9 months 18 days
Exercisable options, aggregate intrinsic value at September 30, 2015	$ 14,600,000	$ 14,600,000
Share price (in dollars per share)	$ 25.71	$ 25.71
Pre-tax intrinsic value of options exercised	$ 3,200,000	$ 17,100,000
Equity incentive plan 2015 [Member]
Share-Based Compensation Plans
Number of shares in authorized			38,000,000
Number of shares available for future issuance	37,700,000	37,700,000
Equity Incentive Plan 2015, 2006, and 1996 [Member]
Share-Based Compensation Plans
Number of shares outstanding	22,100,000	22,100,000
Equity Incentive Plan 1996, 2000, and 2006 [Member]
Share-Based Compensation Plans
Maximum additional shares expire unexercised, under 1996 and 2000 plan			29,000,000
Number of shares available for future issuance	0	0
Employee stock purchase plan 2008 [Member]
Share-Based Compensation Plans
Number of shares available for future issuance	7,600,000	7,600,000
Common stock, capital shares reserved for future issuance	26,000,000	26,000,000
Share-based compensation arrangement by share-based payment award, discount from market price		15.00%
Periodic payroll deduction - percentage of base salary	10.00%	10.00%
Maximum purchase of common stock, shares		6,000
Share-based compensation arrangement by share-based payment award, offering period		12 months
Maximum purchase of common stock, value		$ 25,000
Share-based compensation arrangement by share-based payment award, expiration period		1 year
Common stock, shares, issued	18,400,000	18,400,000
Employee Stock Purchase Plan 2008 Additional Authorization [Member]
Share-Based Compensation Plans
Common stock, capital shares reserved for future issuance	7,000,000	7,000,000

Employee Benefit Plans, Share B

Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 22, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Weighted Average Grant-Date Fair Value per Share
Common stock, dividends paid per share (in dollar per share)	$ 0.1
Common stock dividends paid	$ 38.5			$ 118
Employee stock purchase plan 2008 [Member]
Employee Stock Purchase Plan
Employee stock purchase plans offering period duration				6 months
Stock issued during period, shares, employee stock purchase plans		1,300,000	1,400,000	2,700,000	2,900,000
Average price of common stock, per share (in dollars per share)		$ 19.18	$ 20.01	$ 19.25	$ 19.30
RSUs, RSAs, and PSAs [Member]
Number of Shares
Balance as of December 31, 2014 (in shares)				21,300,000
Balance as of September 30, 2015 (in shares)		19,600,000		19,600,000
Weighted Average Grant-Date Fair Value per Share
Balance as of December 31, 2014 (in dollars per share)				$ 22.05
Balance as of September 30, 2015 (in dollars per share)		$ 22.15		$ 22.15
Weighted Average Remaining Contractual Term (In Years)				1 year 2 months 12 days
Aggregate Intrinsic Value		$ 504.4		$ 504.4
Restricted stock units (RSUs)
Number of Shares
Granted (in shares)				8,100,000
Vested (in shares)				(6,000,000)
Canceled (in shares)				(1,900,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)				$ 22.90
Vested (in dollars per share)				23.19
Canceled (in dollars per share)				$ 22.09
Performance shares (PSAs)
Number of Shares
Granted (in shares)				800,000
Vested (in shares)				(300,000)
Canceled (in shares)				(1,000,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)				$ 22.44
Vested (in dollars per share)				22.52
Canceled (in dollars per share)				$ 22.28
Aggregate number of shares subject to PSAs granted				500,000
Minimum shares to be issued on achievement of performance goals in respect of PSAs				0
Maximum shares to be issued on achievement of performance goals in respect of PSAs				800,000
Restricted stock awards (RSAs)
Number of Shares
Vested (in shares)				(1,400,000)
Weighted Average Grant-Date Fair Value per Share
Vested (in dollars per share)				$ 20.28

Employee Benefit Plans, Assumpt

Employee Benefit Plans, Assumptions and Resulting Estimates of Fair Value (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
ESPP [Member]
Estimates of Fair Value
Volatility	26.00%	27.00%	29.00%	30.00%
Risk-free interest rate	0.20%	0.10%	0.10%	0.10%
Expected life (years)	6 months	6 months	6 months	6 months
Dividend yield	1.40%	1.80%	1.70%	1.00%
Weighted-average fair value per share (in dollars per share)	$ 6.20	$ 5.13	$ 5.63	$ 5.72
Market-based RSUs [Member]
Estimates of Fair Value
Volatility			34.00%	36.00%
Risk-free interest rate			1.40%	1.60%
Dividend yield			1.80%
Weighted-average fair value per share (in dollars per share)			$ 14.97	$ 18.28
Market-based RSUs [Member] | Minimum [Member]
Estimates of Fair Value
Dividend yield				0.00%
Market-based RSUs [Member] | Maximum [Member]
Estimates of Fair Value
Dividend yield				1.50%

Employee Benefit Plans, Share65

Employee Benefit Plans, Share Based Compensation by Cost and Expense Categories (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 56.5	$ 65.3	$ 161.3	$ 185.4
Stock Options [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.5	3.2	5.2	12
RSUs, RSAs, and PSAs [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	52.4	58.2	146.3	161.9
ESPP [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	2.6	3.9	9.8	11.5
Cost of Revenues, Product [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.3	1.3	4.5	3.9
Cost of Revenues, Service [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	3.2	3.6	10.4	10.7
Research and Development [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	31	37.1	94.1	100.8
Sales and Marketing [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	13	15.9	32.2	44.9
General and Administrative [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 8	$ 7.4	$ 20.1	$ 25.1

Employee Benefit Plans, Share66

Employee Benefit Plans, Share Based Compensation by Share Based Payment Award Types (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)
Stock Options [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost	$ 3.8
Weighted Average Period (In Years)	9 months 18 days
RSUs, RSAs, and PSAs [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost	$ 241.9
Weighted Average Period (In Years)	1 year 9 months 18 days

Segments (Details)

Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total net revenues	$ 1,248.6	$ 1,125.9	$ 3,538.2	$ 3,525.5
Routing [Member]
Segment Reporting Information [Line Items]
Total net revenues	604.4	533.2	1,711.6	1,700.8
Switching [Member]
Segment Reporting Information [Line Items]
Total net revenues	201.4	155	558.1	546.8
Security [Member]
Segment Reporting Information [Line Items]
Total net revenues	119.6	121.3	319.5	367.1
Total product [Member]
Segment Reporting Information [Line Items]
Total net revenues	925.4	809.5	2,589.2	2,614.7
Total service [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 323.2	$ 316.4	$ 949	$ 910.8

Segments, Geographical (Details

Segments, Geographical (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Net Revenues by Geographic Region [Line Items]
Total net revenues	$ 1,248.6	$ 1,125.9	$ 3,538.2	$ 3,525.5
Property and equipment, net and purchased intangible assets, net	999.1		999.1		$ 966.7
United States [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	665.6	621.3	1,869.7	1,905.7
Property and equipment, net and purchased intangible assets, net	879.1		879.1		871.7
Other [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	47.2	57	167.9	165.1
Americas [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	712.8	678.3	2,037.6	2,070.8
EMEA [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	355	290.5	975.1	911
Asia Pacific [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	180.8	$ 157.1	525.5	$ 543.7
International [Member]
Net Revenues by Geographic Region [Line Items]
Property and equipment, net and purchased intangible assets, net	$ 120		$ 120		$ 95

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2009
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, at federal statutory income tax rate		20.80%	37.40%	26.30%	28.40%
Federal statutory rate			35.00%	35.00%
Cost-sharing adjustment, discrete amount		$ 13.2	$ 0	$ 13.2	$ 0
Tax on equity investments		0	0.7	0	36.3
Restructuring		0	9.2	0	(46.7)
Tax on gain on litigation settlement		0	$ 0	0	44.7
Cost-sharing adjustment	$ 70.3			18
Valuation allowance release related to gain on sale of equity investments					$ 24.7
Unrecognized tax benefits		211.4		211.4
Unrecognized tax benefits that would impact effective tax rate		176.7		176.7
Foreign country
Income Tax Contingency [Line Items]
Interest and penalties recorded						$ 4.6
Maximum [Member]
Income Tax Contingency [Line Items]
Greater than remote likelihood decrease in gross unrecognized tax benefits within next 12 months		$ 4.7		$ 4.7

Net Income Per Share (Details)

Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator
Net income	$ 197.7	$ 103.6	$ 435.9	$ 435.3
Denominator
Weighted-average shares used to compute basic net income per share	382.8	448.4	393.2	468.1
Dilutive effect of employee stock awards	6.4	6.4	8	8.9
Weighted-average shares used to compute diluted net income per share	389.2	454.8	401.2	477
Net income per share:
Basic, in dollars per share	$ 0.52	$ 0.23	$ 1.11	$ 0.93
Diluted, in dollars per share	$ 0.51	$ 0.23	$ 1.09	$ 0.91
Net Income per Share Textuals
Potential anti-dilutive shares	3.1	10.2	3.7	10.8

Commitments and Contingencies (

Commitments and Contingencies (Details) ft² in Thousands, $ in Millions	Jul. 10, 2015USD ($)ft²	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2014USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Mar. 31, 2014USD ($)	Mar. 31, 2011USD ($)
Summarization of principal contractual obligations
Future minimum payments under the non-cancelable operating leases	$ 118.1	$ 123.1		$ 123.1
Rent expense		33.2	$ 36.5	10.8	$ 10.8
Lease term, option to extend	20 years
Square feet of leased space | ft²	63
Term of lease	10 years
Tenant allowance	$ 6
Property and equipment, net		959.9		959.9			$ 904.3
Total purchase commitments		558.7		558.7
Accrual for estimated carrying charges or obsolete materials charges		19.2		19.2
Short-term debt		299.9		299.9			0
Long-term debt, carrying value		1,648.7		1,648.7			1,349
Indemnity-related and service-related escrows		33.9		33.9
Campus build out commitments		3.5		3.5
Other contractual obligations		22.5		22.5
Long-term income taxes payable		185		185			$ 177.5
Construction in Progress [Member]
Summarization of principal contractual obligations
Property and equipment, net		10.1		10.1
Fixed rate note due 2016 [Member]
Summarization of principal contractual obligations
Short-term debt, gross		$ 300		$ 300					$ 300
Short-term and Long-term debt, stated interest rate		3.10%		3.10%					3.10%
Fixed rate note due 2020 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300		$ 300		$ 300
Short-term and Long-term debt, stated interest rate		3.30%		3.30%		3.30%
Fixed rate note due 2021 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300		$ 300					$ 300
Short-term and Long-term debt, stated interest rate		4.60%		4.60%					4.60%
Fixed rate note due 2024 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 350		$ 350				$ 350
Short-term and Long-term debt, stated interest rate		4.50%		4.50%				4.50%
Fixed rate note due 2025 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300		$ 300		$ 300
Short-term and Long-term debt, stated interest rate		4.35%		4.35%		4.35%
Fixed rate note due 2041 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 400		$ 400					$ 400
Short-term and Long-term debt, stated interest rate		5.95%		5.95%					5.95%
Minimum [Member]
Summarization of principal contractual obligations
Increment for lease extension	5 years
Maximum [Member]
Summarization of principal contractual obligations
Increment for lease extension	10 years

Commitments and Contingencies,

Commitments and Contingencies, Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Financing guarantees, bank guarantees, and standby letters of credit [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value	$ 16.8	$ 26.2
Financing guarantee with recourse [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value	11.2
Other Current Liabilities [Member] | Indemnification Agreement [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value	$ 15

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions	Oct. 22, 2015	Jul. 23, 2015	Apr. 23, 2015	Jan. 27, 2015	Nov. 05, 2015	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Apr. 01, 2017	Dec. 31, 2014	Oct. 01, 2014
Subsequent Event [Line Items]
Promissory note in connection with the sale of Junos Pulse						$ 125,000,000			$ 125,000,000			$ 125,000,000
Cash dividends declared per common stock (in dollar per share)		$ 0.10	$ 0.1	$ 0.1		$ 0.10	$ 0.10		$ 0.3	$ 0.10
Common stock repurchased under stock repurchase program average purchase price (in dollars per share)						$ 28.01	$ 23.44		$ 24.78
Stock repurchased and retired						1.8	23.5		42.4
2014 Stock Repurchase Program [Member]
Subsequent Event [Line Items]
Stock repurchased and retired								33.3
Stock repurchase program, remaining authorized repurchase amount						$ 625,000,000			$ 625,000,000
Junos Pulse [Member]
Subsequent Event [Line Items]
Promissory note in connection with the sale of Junos Pulse													$ 125,000,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividends declared per common stock (in dollar per share)	$ 0.1
Subsequent Event [Member] | 2014 Stock Repurchase Program [Member]
Subsequent Event [Line Items]
Shares repurchased, in shares					1.1
Shares repurchased, value					$ 35,000,000
Common stock repurchased under stock repurchase program average purchase price (in dollars per share)					$ 31.59
Stock repurchased and retired					0.8
Stock repurchase program, remaining authorized repurchase amount					$ 590,000,000
Subsequent Event [Member] | Scenario, Forecast [Member] | Junos Pulse [Member]
Subsequent Event [Line Items]
Required minimum payment due on notes receivable											$ 75,000,000