Juniper Networks (JNPR) 10-Q 4 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 29, 2016
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	Jun. 30, 2016
Amendment Flag	false
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
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		382,962,669

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net revenues:
Product	$ 862.1	$ 899.7	$ 1,615.1	$ 1,663.8
Service	359.2	322.5	704.1	625.8
Total net revenues	1,221.3	1,222.2	2,319.2	2,289.6
Cost of revenues:
Product	328.3	311.7	606.2	600.5
Service	136.6	129	265.7	250.3
Total cost of revenues	464.9	440.7	871.9	850.8
Gross margin	756.4	781.5	1,447.3	1,438.8
Operating expenses:
Research and development	247.9	251.6	498.9	500.3
Sales and marketing	243.7	232.4	475.5	452.6
General and administrative	58.6	56.3	118	111.5
Restructuring charges (benefits)	2.4	(1.9)	2.4	(0.5)
Total operating expenses	552.6	538.4	1,094.8	1,063.9
Operating income	203.8	243.1	352.5	374.9
Other expense, net	(11.6)	(17.1)	(33.8)	(32.9)
Income before income taxes	192.2	226	318.7	342
Income tax provision	52.2	68	87.3	103.8
Net income	$ 140	$ 158	$ 231.4	$ 238.2
Net income per share:
Basic, in dollars per share	$ 0.37	$ 0.41	$ 0.60	$ 0.60
Diluted, in dollars per share	$ 0.36	$ 0.40	$ 0.60	$ 0.59
Shares used in computing net income per share:
Basic (in shares)	382.8	389.9	383	398.4
Diluted (in shares)	386.3	397.2	388.6	406.1
Cash dividends declared per common stock (in dollars per share)	$ 0.1	$ 0.1	$ 0.2	$ 0.2

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 140	$ 158	$ 231.4	$ 238.2
Available-for-sale securities:
Unrealized gains on available-for-sale securities, net of tax benefit of $0.6 and $0.7 during the three and six months ended June 30, 2016, respectively, and $5.4 and $1.6 for the corresponding periods of the fiscal year ended December 31, 2015 (fiscal 2015), respectively	1.7	9	6	8.2
Reclassification adjustment for realized net gains on available-for-sale securities included in net income, net of tax provisions of $0.5 and $0.5 during the three and six months ended June 30, 2016, respectively, and zero for the corresponding periods of fiscal 2015	(1)	(0.3)	(0.8)	(0.5)
Net change on available-for-sale securities, net of taxes	0.7	8.7	5.2	7.7
Cash flow hedges:
Unrealized gains (loss) on cash flow hedges, net of tax provisions of $0.1 and $0.6 during the three and six months ended June 30, 2016, respectively, and $0.4 and $0.7 for the corresponding periods of fiscal 2015, respectively	1.4	2.4	3.9	(4)
Reclassification adjustment for realized net (gains) losses on cash flow hedges included in net income, net of tax provisions of $0.3 and $0.1 during the three and six months ended June 30, 2016, respectively, and zero and $0.1 for the corresponding periods of fiscal 2015, respectively	(1.2)	3.8	(0.1)	6.9
Net change on cash flow hedges, net of taxes	0.2	6.2	3.8	2.9
Change in foreign currency translation adjustments	2.2	7	5.8	(4.1)
Other comprehensive income, net of tax	3.1	21.9	14.8	6.5
Comprehensive income	$ 143.1	$ 179.9	$ 246.2	$ 244.7

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income Parentheticals (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Tax benefit on change in unrealized gains on available-for-sale securities	$ (0.6)	$ (5.4)	$ (0.7)	$ (1.6)
Tax provision on reclassification adjustment for realized net gains on available-for-sale securities included in net income	0.5	0	0.5	0
Tax provision on change in unrealized gains (loss) on cash flow hedges	0.1	0.4	0.6	0.7
Tax provision on reclassification adjustment for realized net (gains) losses included in net income	$ 0.3	$ 0	$ 0.1	$ 0.1

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,756.9	$ 1,420.9
Short-term investments	587.1	527.1
Accounts receivable, net of allowances	750.3	780.7
Prepaid expenses and other current assets	359.5	183.7
Total current assets	3,453.8	2,912.4
Property and equipment, net	1,066.6	1,021
Long-term investments	1,147.1	1,244.2
Restricted cash and investments	65.2	36.2
Purchased intangible assets, net	69.1	33.9
Goodwill	3,001.6	2,981.3
Other long-term assets	259.4	378.9
Total assets	9,062.8	8,607.9
Current liabilities:
Short-term debt	0	299.9
Accounts payable	228.4	159.3
Accrued compensation	199.2	269.5
Deferred revenue	933	822.9
Other accrued liabilities	221.2	250.3
Total current liabilities	1,581.8	1,801.9
Long-term debt	2,132.5	1,637.5
Long-term deferred revenue	362.6	345.2
Long-term income taxes payable	199.8	187.3
Other long-term liabilities	109.9	61.6
Total liabilities	4,386.6	4,033.5
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; 382.8 shares and 384.0 shares issued and outstanding as of June 30, 2016 and December 31, 2015, respectively	0	0
Additional paid-in capital	8,277	8,334.8
Accumulated other comprehensive loss	(4.4)	(19.2)
Accumulated deficit	(3,596.4)	(3,741.2)
Total stockholders' equity	4,676.2	4,574.4
Total liabilities and stockholders' equity	$ 9,062.8	$ 8,607.9

Condensed Consolidated Balance6

Condensed Consolidated Balance Sheets Parentheticals (Unaudited) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
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	382,800,000	384,000,000
Common stock - outstanding	382,800,000	384,000,000

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 231.4	$ 238.2
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	107.4	104.9
Depreciation, amortization, and accretion	98.6	89
Restructuring and non-cash acquisition charges (benefits)	5.2	(0.5)
Deferred income taxes	42.7	23.9
Loss (gain) on investments, net	1.8	(0.8)
Excess tax benefits from share-based compensation	(5.6)	(4.3)
Loss on disposal of fixed assets	0	(0.4)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable, net	39.5	29
Prepaid expenses and other assets	(58)	(41.7)
Accounts payable	62.9	(13.8)
Accrued compensation	(67.2)	3.6
Income taxes payable	(23.6)	56.7
Other accrued liabilities	(24.7)	(30.7)
Deferred revenue	116.4	28.6
Net cash provided by operating activities	526.8	482.5
Cash flows from investing activities:
Purchases of property and equipment	(116.9)	(83.8)
Purchases of available-for-sale investments	(794.9)	(841.3)
Proceeds from sales of available-for-sale investments	665.8	450.9
Proceeds from maturities of available-for-sale investments	152.8	115.9
Purchases of trading investments	(3.2)	(2.5)
Proceeds from sales of privately-held investments	2.8	0
Purchases of privately-held investments	(10.5)	(3.2)
Payments for business acquisitions, net of cash and cash equivalents acquired	22.8	0
Changes in restricted cash	(0.5)	0
Net cash used in investing activities	(126.4)	(364)
Cash flows from financing activities:
Proceeds from issuance of common stock	32.2	63
Purchases and retirement of common stock	(210.1)	(1,004.7)
Issuance of long-term debt, net	494	594.6
Payment of long-term debt	(300)	0
Payment under lease obligations	(0.9)	0.4
Payment of assumed debt	(15.5)	0
Excess tax benefits from share-based compensation	5.6	4.3
Payment of cash dividends	(76.4)	(79.5)
Net cash used in financing activities	(71.1)	(421.9)
Effect of foreign currency exchange rates on cash and cash equivalents	6.7	(5.9)
Net increase (decrease) in cash and cash equivalents	336	(309.3)
Cash and cash equivalents at beginning of period	1,420.9	1,639.6
Cash and cash equivalents at end of period	$ 1,756.9	$ 1,330.3

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
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. 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 six months ended June 30, 2016 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 , or any future period. The Condensed Consolidated Balance Sheet as of June 30, 2016 , has been derived from the audited Consolidated Financial Statements for the year ended December 31, 2015 but does not include all of the information and footnotes required by GAAP for complete financial statements. 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, 2015 . As a result of the adoption of Accounting Standards Update ("ASU") No. 2015-03 (Subtopic 835-30) - Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"), 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, the Company decreased both other long-term assets and long-term debt as of December 31, 2015 on the Condensed Consolidated Balance Sheets by $11.3 million . 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	6 Months Ended
	Jun. 30, 2016
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, 2015 . Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-13 (Topic 326) Financial Instruments - Credit Losses. The pronouncement was issued to provide more decision-useful information about the expected credit losses on financial instruments and changes the loss impairment methodology. This pronouncement is effective for reporting periods beginning after December 15, 2019, and interim periods within those fiscal years, using a modified retrospective adoption method. A prospective transition approach is required for debt securities for which an other-than-temporary impairment had been recognized. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-09 (Topic 718) Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeiture, statutory tax withholding requirements, and classification on the statement of cash flows. ASU-2016-09 is effective for interim and annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-07 (Topic 323) Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting ("ASU 2016-07"), which eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. This update requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. This update requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive loss at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-06 (Topic 815) Derivatives and Hedging: Contingent Put and Call Options in Debt Instruments ("ASU 2016-06"), which requires that embedded derivatives be separated from the host contract and accounted for separately as derivatives if certain criteria are met. One of those criteria is that the economic characteristics and risks of the embedded derivatives are not clearly and closely related to the economic characteristics and risks of the host contract (the “clearly and closely related” criterion). In addition, in March 2016, the FASB issued ASU No. 2016-05 (Topic 815), Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, ("ASU 2016-05"), which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under Topic 815 does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. ASU 2016-06 and ASU 2016-05 are effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases ("ASU 2016-02"), which requires recognition of lease assets and lease liabilities on the balance sheet by the lessees for lease contracts with a lease term of more than twelve months. ASU 2016-02 should be applied on a modified retrospective basis and is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires equity investments to be measured at fair value with changes in fair value recognized in net income and simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. Entities may choose a practical expedient, to estimate the fair value of certain equity securities that do not have readily determinable fair value. If the practical expedient is elected, these investments would be recorded at cost, less impairment and subsequently adjusted for observable price changes. The guidance also updates certain presentation and disclosure requirements. ASU 2016-01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is not permitted. The Company is currently evaluating the impact that ASU 2016-01will have on its Consolidated Financial Statements and disclosures. In July 2015, the FASB issued ASU No. 2015-11 (Subtopic 330) - Simplifying the Measurement of Inventory ("ASU 2015-11"), 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 adoption of this standard will not have a significant impact on the Company's 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. Accordingly, the ASU will be effective for the Company beginning fiscal year 2018. In addition, in March 2016, the FASB issued ASU No. 2016-08 (Topic 606) Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (“ASU 2016-08”) , which clarifies the principal-versus-agent guidance in Topic 606 and requires an entity to determine whether the nature of its promise to provide goods or services to a customer is performed in a principal or agent capacity and to recognize revenue in a gross or net manner based on its principal/agent designation. In April 2016, the FASB also issued ASU No. 2016-10 (Topic 606) Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing (“ASU 2016-10”), which amends the revenue guidance on identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB also issued ASU No. 2016-12 (Topic 606) Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”), which amends the revenue guidance to clarify measurement and presentation as well as to include some practical expedients and policy elections. There are two transition methods available under the new standard, either cumulative effect or retrospective. ASU 2016-08, ASU 2016-10, and ASU 2016-12 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently evaluating the impact of the adoption of this standard on its Consolidated Financial Statements and disclosures.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Business Combinations	Business Combinations On April 1, 2016, the Company acquired the remaining ownership interest in BTI Systems Inc. (“BTI”), increasing its ownership from 12% to 100% , for $26.1 million of cash. BTI is a privately-held provider of cloud and metro networking systems and software to content, cloud, and service providers. The Company acquired BTI on the expectation that this would accelerate the delivery of open and automated packet optical transport solutions with integrated network management based on BTI Systems' proNX Service Manager and Juniper's Connectivity Services Director, as well as the NorthStar Controller. Prior to the acquisition, the Company had a pre-existing investment in BTI's equity and remeasured the investment to its fair value of $17.1 million , which was based upon adjustments market participants would consider when estimating the fair value. The Company also held $0.9 million of convertible debt measured at fair value and settled upon acquisition. The aggregate value of $44.1 million , consisting of cash consideration of $26.1 million and $18.0 million for the fair value of the previous investments in BTI was allocated as follows (in millions): Net tangible liabilities assumed $ (19.5 ) Intangible assets acquired 43.3 Goodwill 20.3 Total $ 44.1 The goodwill recognized for the acquisition of BTI was primarily attributable to expected synergies and is not deductible for U.S. federal income tax purposes. Upon acquisition, the Company also repaid $18.6 million of certain outstanding BTI liabilities assumed. Additionally, under the terms of the acquisition agreement, the Company assumed share-based awards for employees with a fair value of $8.6 million , which were granted in contemplation of future services and will be expensed as share-based compensation over the remaining service period. The Company's Condensed Consolidated Financial Statements include the operating results of this business combination from the date of acquisition. Pro forma results of operations for this acquisition have not been presented as the financial impact to the Company's consolidated results of operations is not material. The Company recognized $1.3 million and $4.2 million of acquisition-related costs during the three and six months ended June 30, 2016, respectively. These acquisition-related costs were expensed in the period incurred within general and administrative expense in the Company's Condensed Consolidated Statements of Operations. There were no such charges during the three and six months ended June 30, 2015. The Company also recorded $2.4 million of restructuring charges during the three and six months ended June 30, 2016, related to severance costs for certain former BTI employees which were recorded in restructuring charges (benefit) in the Condensed Consolidated Statements of Operations. Intangible Assets Acquired The following table presents details of the Company's intangible assets acquired through the business combination completed during the three months and six months ended June 30, 2016 (in millions, except years): Weighted Average Estimated Useful Life (In Years) Amount Existing technology 8 $ 37.1 Customer relationships 8 5.3 Trade name 1 0.6 Backlog 1 0.3 Total $ 43.3 Additional information, such as income tax and other contingencies, existing as of the acquisition date but unknown to the Company may become known during the remainder of the measurement period, not to exceed 12 months from the acquisition date, which may result in changes to the amounts and allocations recorded.

Cash Equivalents and Investment

Cash Equivalents and Investments	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 and December 31, 2015 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of June 30, 2016 Fixed income securities: Asset-backed securities $ 320.3 $ 0.4 $ — $ 320.7 Certificates of deposit 19.4 — — 19.4 Commercial paper 6.7 — — 6.7 Corporate debt securities 861.3 3.0 (0.6 ) 863.7 Foreign government debt securities 35.5 — — 35.5 Government-sponsored enterprise obligations 177.1 0.1 — 177.2 U.S. government securities 366.2 0.5 — 366.7 Total fixed income securities 1,786.5 4.0 (0.6 ) 1,789.9 Money market funds 538.7 — — 538.7 Mutual funds 5.8 — — 5.8 Publicly-traded equity securities 6.2 — (1.7 ) 4.5 Total available-for-sale securities 2,337.2 4.0 (2.3 ) 2,338.9 Trading securities in mutual funds (*) 19.3 — — 19.3 Total $ 2,356.5 $ 4.0 $ (2.3 ) $ 2,358.2 Reported as: Cash equivalents $ 555.2 $ — $ — $ 555.2 Restricted investments 68.8 — — 68.8 Short-term investments 588.5 0.4 (1.8 ) 587.1 Long-term investments 1,144.0 3.6 (0.5 ) 1,147.1 Total $ 2,356.5 $ 4.0 $ (2.3 ) $ 2,358.2 ________________________________ (*) 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, 2015 Fixed income securities: Asset-backed securities $ 312.2 $ — $ (0.5 ) $ 311.7 Certificates of deposit 9.6 — — 9.6 Commercial paper 17.7 — — 17.7 Corporate debt securities 913.8 0.2 (2.6 ) 911.4 Foreign government debt securities 16.5 — — 16.5 Government-sponsored enterprise obligations 204.1 — (0.4 ) 203.7 U.S. government securities 278.0 — (0.4 ) 277.6 Total fixed income securities 1,751.9 0.2 (3.9 ) 1,748.2 Money market funds 29.7 — — 29.7 Mutual funds 6.1 0.1 — 6.2 Publicly-traded equity securities 8.7 0.8 (0.7 ) 8.8 Total available-for-sale securities 1,796.4 1.1 (4.6 ) 1,792.9 Trading securities in mutual funds (*) 17.7 — — 17.7 Total $ 1,814.1 $ 1.1 $ (4.6 ) $ 1,810.6 Reported as: Cash equivalents $ 3.4 $ — $ — $ 3.4 Restricted investments 35.8 0.1 — 35.9 Short-term investments 527.2 0.9 (1.0 ) 527.1 Long-term investments 1,247.7 0.1 (3.6 ) 1,244.2 Total $ 1,814.1 $ 1.1 $ (4.6 ) $ 1,810.6 ________________________________ (*) 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 June 30, 2016 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Due in less than one year $ 642.4 $ 0.4 $ (0.1 ) $ 642.7 Due between one and five years 1,144.1 3.6 (0.5 ) 1,147.2 Total $ 1,786.5 $ 4.0 $ (0.6 ) $ 1,789.9 The Company had 214 and 682 investments in unrealized loss positions as of June 30, 2016 and December 31, 2015 , 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 June 30, 2016 , 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 six months ended June 30, 2016 and June 30, 2015 . 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 six months ended June 30, 2016 and June 30, 2015 , the Company did not recognize other-than-temporary impairments associated with these investments. During the three and six months ended June 30, 2016 and June 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. The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of June 30, 2016 and December 31, 2015 (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 June 30, 2016 Fixed income securities: Asset-backed securities (1)(2) $ 82.4 $ — $ 12.4 $ — $ 94.8 $ — Certificates of deposit (2) 3.3 — — — 3.3 — Corporate debt securities 153.9 (0.3 ) 93.8 (0.3 ) 247.7 (0.6 ) Foreign government debt securities (2) 13.5 — — — 13.5 — Government-sponsored enterprise obligations (2) 23.0 — — — 23.0 — U.S. government securities (2) 17.2 — — — 17.2 — Total fixed income securities 293.3 (0.3 ) 106.2 (0.3 ) 399.5 (0.6 ) Publicly-traded equity securities 4.5 (1.7 ) — — 4.5 (1.7 ) Total available-for-sale securities $ 297.8 $ (2.0 ) $ 106.2 $ (0.3 ) $ 404.0 $ (2.3 ) ________________________________ (1) Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of June 30, 2016 . (2) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of June 30, 2016 . 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, 2015 Fixed income securities: Asset-backed securities $ 274.2 $ (0.4 ) $ 30.8 $ (0.1 ) $ 305.0 $ (0.5 ) Certificates of deposit (*) 3.3 — — — $ 3.3 — Corporate debt securities 687.9 (2.3 ) 58.9 (0.3 ) 746.8 (2.6 ) Foreign government debt securities (*) 9.5 — — — 9.5 — Government-sponsored enterprise obligations 185.3 (0.4 ) — — 185.3 (0.4 ) U.S. government securities 259.3 (0.4 ) — — 259.3 (0.4 ) Total fixed income securities 1,419.5 (3.5 ) 89.7 (0.4 ) 1,509.2 (3.9 ) Publicly-traded equity securities 2.1 (0.7 ) — — 2.1 (0.7 ) Total available-for-sale securities $ 1,421.6 $ (4.2 ) $ 89.7 $ (0.4 ) $ 1,511.3 $ (4.6 ) ________________________________ (*) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2015 . 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 2016; (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; (iii) the Directors and Officers indemnification trust (“D&O Trust”); (iv) amounts held under the Company's short-term disability plan in California; and (v) amounts under the non-qualified deferred compensation ("NQDC") plan for officers and other senior employees. The restricted investments are designated as available-for-sale securities except the NQDC plan which is designated as trading 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 June 30, 2016 and December 31, 2015 , the carrying values of the Company's privately-held investments of $88.5 million and $102.4 million , respectively, were included in other long-term assets in the Condensed Consolidated Balance Sheets. As of June 30, 2016 and December 31, 2015 , the carrying value of the privately-held investments includes debt and redeemable preferred stock securities of $51.4 million and $60.2 million , respectively. For the three and six months ended June 30, 2016 and June 30, 2015 , there were no unrealized gains or losses associated with the privately-held debt and redeemable preferred stock securities. The Company reviews its investments to identify and evaluate investments that have an indication of possible impairment. During the six months ended June 30, 2016 , the Company determined that certain privately-held investments were other-than-temporarily impaired, resulting in impairment charges of $5.1 million that were recorded within other expense, net in the Condensed Consolidated Statement of Operations. No such charges were recorded during the three months ended June 30, 2016 and three and six months ended June 30, 2015 .

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 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 $ — $ 320.7 $ — $ 320.7 Certificates of deposit — 19.4 — 19.4 Commercial paper — 6.7 — 6.7 Corporate debt securities — 863.7 — 863.7 Foreign government debt securities — 35.5 — 35.5 Government-sponsored enterprise obligations — 177.2 — 177.2 Money market funds (1) 538.7 — — 538.7 Mutual funds (2) 5.8 — — 5.8 Publicly-traded equity securities 4.5 — — 4.5 U.S. government securities 295.5 71.2 — 366.7 Total available-for-sale securities 844.5 1,494.4 — 2,338.9 Trading securities in mutual funds (3) 19.3 — — 19.3 Privately-held debt and redeemable preferred stock securities — — 51.4 51.4 Derivative assets: Foreign exchange contracts — 2.8 — 2.8 Total assets measured at fair value $ 863.8 $ 1,497.2 $ 51.4 $ 2,412.4 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (0.3 ) $ — $ (0.3 ) Total liabilities measured at fair value $ — $ (0.3 ) $ — $ (0.3 ) Total assets measured at fair value, reported as: Cash equivalents $ 495.0 $ 60.2 $ — $ 555.2 Restricted investments 68.8 — — 68.8 Short-term investments 122.4 464.7 — 587.1 Long-term investments 177.6 969.5 — 1,147.1 Prepaid expenses and other current assets — 2.8 — 2.8 Other long-term assets — — 51.4 51.4 Total assets measured at fair value $ 863.8 $ 1,497.2 $ 51.4 $ 2,412.4 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (0.3 ) $ — $ (0.3 ) Total liabilities measured at fair value $ — $ (0.3 ) $ — $ (0.3 ) ________________________________ (1) Balance includes $43.7 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 restricted investments measured at fair value related to the Company's NQDC plan assets. Fair Value Measurements at December 31, 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 $ — $ 311.7 $ — $ 311.7 Certificates of deposit — 9.6 — 9.6 Commercial paper — 17.7 — 17.7 Corporate debt securities — 911.4 — 911.4 Foreign government debt securities — 16.5 — 16.5 Government-sponsored enterprise obligations — 203.7 — 203.7 Money market funds (1) 29.7 — — 29.7 Mutual funds (2) 6.2 — — 6.2 Publicly-traded equity securities 8.8 — — 8.8 U.S. government securities 247.3 30.3 — 277.6 Total available-for-sale securities 292.0 1,500.9 — 1,792.9 Trading securities in mutual funds (3) 17.7 — — 17.7 Privately-held debt and redeemable preferred stock securities — — 60.2 60.2 Derivative assets: Foreign exchange contracts — 0.4 — 0.4 Total assets measured at fair value $ 309.7 $ 1,501.3 $ 60.2 $ 1,871.2 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 $ — $ 3.4 $ — $ 3.4 Restricted investments 35.9 — — 35.9 Short-term investments 108.2 418.9 — 527.1 Long-term investments 165.6 1,078.6 — 1,244.2 Prepaid expenses and other current assets — 0.4 — 0.4 Other long-term assets — — 60.2 60.2 Total assets measured at fair value $ 309.7 $ 1,501.3 $ 60.2 $ 1,871.2 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 NQDC 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 six months ended June 30, 2016 , 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 six months ended June 30, 2016 , there were purchases of $10.5 million related to privately-held debt securities and no purchases during the three months ended June 30, 2016 . 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 June 30, 2016, the Company had no assets measured at fair value on a nonrecurring basis. As of December 31, 2015 , the Company had no significant privately-held equity investments measured at fair value on a nonrecurring basis. As of June 30, 2016 and December 31, 2015 , 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 June 30, 2016 and December 31, 2015 , the estimated fair value of the Company's long-term debt in the Condensed Consolidated Balance Sheets was approximately $2,246.5 million and $1,946.7 million , respectively, based on observable market inputs (Level 2). The carrying value of the promissory note, issued to the Company in connection with the sale of Junos Pulse, of $132.9 million approximates its fair value, of which $75 million is recorded in prepaid expenses and other current assets and the remaining balance is recorded within other long-term assets in the Condensed Consolidated Balance Sheets as of June 30, 2016 . As of December 31, 2015 , the carrying value of the promissory note of $132.9 million was recorded in other long-term assets in the Condensed Consolidated Balance Sheets. The promissory note is classified as a Level 3 asset due to the absence of quoted market prices and inherent lack of liquidity. See Note 8, Other Financial Information , for further information on the promissory note.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2016
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 June 30, December 31, Cash flow hedges $ 136.4 $ 116.8 Non-designated derivatives — 71.8 Total $ 136.4 $ 188.6 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, 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 5, Fair Value Measurements , for the fair values of the Company's derivative instruments in the Condensed Consolidated Balance Sheets. During the three and six months ended June 30, 2016 , the Company recognized unrealized gains of $1.5 million and $4.5 million , respectively, in accumulated other comprehensive loss for the effective portion of its derivative instruments and reclassified a realized gain during the three and six months ended June 30, 2016 of $1.5 million and $0.2 million , respectively, from other comprehensive loss to cost of revenues and operating expense in the Condensed Consolidated Statements of Operations. During the three and six months ended June 30, 2015 , the Company recognized an unrealized gain of $2.8 million and an unrealized loss of $3.3 million , respectively, in accumulated other comprehensive loss for the effective portion of its derivative instruments and reclassified a realized loss of $3.8 million and $6.8 million , respectively, from other comprehensive loss to cost of revenues and 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 six months ended June 30, 2016 and June 30, 2015 . 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, 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 six months ended June 30, 2016 , the Company recognized a net gain of $0.1 million and a net loss of $1.2 million , respectively, on non-designated derivative instruments within other expense, net in its Condensed Consolidated Statement of Operations. During the three and six months ended June 30, 2015 , the Company recognized net losses of $2.4 million and $0.3 million , respectively, on non-designated derivative instruments within other expense, 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 June 30, 2016 and December 31, 2015 , 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	6 Months Ended
	Jun. 30, 2016
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 six months ended June 30, 2016 (in millions): Balance as of December 31, 2015 $ 2,981.3 Additions due to business combination 20.3 Balance as of June 30, 2016 $ 3,001.6 There were no impairments to goodwill during the three and six months ended June 30, 2016 and June 30, 2015 . 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 June 30, 2016 Intangible assets with finite lives: Technologies and patents $ 604.8 $ (498.1 ) $ (49.9 ) $ 56.8 Customer contracts, support agreements, and related relationships 83.4 (69.2 ) (2.8 ) 11.4 Other 2.0 (1.1 ) — 0.9 Total purchased intangible assets $ 690.2 $ (568.4 ) $ (52.7 ) $ 69.1 As of December 31, 2015 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (491.8 ) $ (49.9 ) $ 26.0 Customer contracts, support agreements, and related relationships 78.1 (67.8 ) (2.8 ) 7.5 Other 1.1 (0.7 ) — 0.4 Total purchased intangible assets $ 646.9 $ (560.3 ) $ (52.7 ) $ 33.9 The following table presents the amortization of intangible assets included in the Condensed Consolidated Statements of Operations (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of revenues $ 3.6 $ 4.7 $ 6.0 $ 15.5 Operating expenses: Sales and marketing 0.8 0.6 1.3 1.4 General and administrative 0.4 0.3 0.8 0.7 Total operating expenses 1.2 0.9 2.1 2.1 Total $ 4.8 $ 5.6 $ 8.1 $ 17.6 During the six months ended June 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 and six ended June 30, 2016 . There were no impairment charges related to purchased intangible assets during the three and six months ended June 30, 2016 and June 30, 2015 . As of June 30, 2016 , the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions): Years Ending December 31, Amount Remainder of 2016 $ 8.1 2017 12.5 2018 10.4 2019 10.2 2020 10.1 Thereafter 17.8 Total $ 69.1

Other Financial Information

Other Financial Information	6 Months Ended
	Jun. 30, 2016
Other Financial Information [Abstract]
Other Financial Information	Other Financial Information Inventories The Company purchases and holds inventory to provide 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 within both 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 June 30, December 31, Production materials $ 82.4 $ 61.9 Finished goods 28.1 13.1 Inventories $ 110.5 $ 75.0 Other Long-Term Assets Other long-term assets consisted of the following (in millions): As of June 30, December 31, Privately-held investments $ 88.5 $ 102.4 Licensed software 6.2 7.1 Federal income tax receivable 40.8 28.9 Inventory 5.6 8.4 Prepaid costs, deposits, and other (*) 47.2 43.3 Deferred tax asset 13.2 55.9 Promissory note in connection with the sale of Junos Pulse 57.9 132.9 Other long-term assets $ 259.4 $ 378.9 ________________________________ (*) During the six months ended June 30, 2016, the Company adopted ASU 2015-03. As a result, debt issuance costs included in prepaid costs, deposits, and other were reclassified to long-term debt as of December 31, 2015 to conform to the current-year presentation. 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”). On October 2, 2015, the Company and the issuer of the Pulse Note mutually agreed to amend the original terms of the Pulse Note to, among other things, extend the maturity date from April 1, 2016 to December 31, 2018, provided 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 and increasing the interest rate on the Pulse Note. In addition, under the amended terms of the Pulse Note, the issuer is required to make a minimum payment of $75.0 million on or prior to April 1, 2017, less any principal amount previously pre-paid to the Company. The $75.0 million portion of the note receivable, is classified as prepaid expenses and other current assets in the Condensed Consolidated Financial Statements. The remaining balance, along with interest paid in kind, is classified as a long-term asset based on expected collection beyond twelve months from the Condensed Consolidated Balance Sheet date. The Company considers notes receivable to be impaired when, based on current information and events, it is probable that the Company will not be able to collect the scheduled payments of principal or interest when due. Further, 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 the impairment assessment, no impairment charge was required to the Pulse Note as of June 30, 2016 . 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 cash flows is less than the recorded investment. During the three and six months ended June 30, 2016 , the related amount of interest income recognized was $2.7 million and $5.3 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 six months ended June 30, 2016 were as follows (in millions): Balance as of December 31, 2015 $ 28.4 Provisions made during the period 13.6 Actual costs incurred during the period (13.5 ) Balance as of June 30, 2016 $ 28.5 Deferred Revenue Details of the Company's deferred revenue, as reported in the Condensed Consolidated Balance Sheets, were as follows (in millions): As of June 30, December 31, Deferred product revenue: Undelivered product commitments and other product deferrals $ 242.5 $ 210.1 Distributor inventory and other sell-through items 99.9 81.8 Deferred gross product revenue 342.4 291.9 Deferred cost of product revenue (51.6 ) (51.6 ) Deferred product revenue, net 290.8 240.3 Deferred service revenue 1,004.8 927.8 Total $ 1,295.6 $ 1,168.1 Reported as: Current $ 933.0 $ 822.9 Long-term 362.6 345.2 Total $ 1,295.6 $ 1,168.1 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, Net Other expense, net, consisted of the following (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Interest income $ 8.5 $ 6.7 $ 16.4 $ 10.5 Interest expense (25.0 ) (21.8 ) (47.5 ) (40.3 ) Gain (loss) on investments 3.6 0.2 (1.8 ) 0.8 Other 1.3 (2.2 ) (0.9 ) (3.9 ) Other expense, net $ (11.6 ) $ (17.1 ) $ (33.8 ) $ (32.9 ) Interest income primarily includes interest earned on the Company’s cash, cash equivalents, investments, and 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.

Debt and Financing

Debt and Financing	6 Months Ended
	Jun. 30, 2016
Debt Instruments [Abstract]
Debt and Financing	Debt and Financing Long-Term Debt The following table summarizes the Company's long-term debt (in millions, except percentages): As of June 30, 2016 Amount Effective Interest Rates Senior Notes: 3.125% fixed-rate notes, due February 2019 $ 350.0 3.36 % 3.300% fixed-rate notes, due June 2020 300.0 3.47 % 4.600% fixed-rate notes, due March 2021 300.0 4.69 % 4.500% fixed-rate notes, due March 2024, issued March 2014 350.0 4.63 % 4.500% fixed-rate notes, due March 2024, issued February 2016 150.0 4.87 % 4.350% fixed-rate notes, due June 2025 300.0 4.47 % 5.950% fixed-rate notes, due March 2041 400.0 6.03 % Total senior notes 2,150.0 Unaccreted discount and debt issuance costs (17.5 ) Total $ 2,132.5 In February 2016, the Company issued $350.0 million aggregate principal amount of 3.125% senior notes due 2019 ("2019 Notes") and $150.0 million aggregate principal amount of 4.50% senior notes due 2024 ("2024 Notes"). 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 addition, in March 2014, the Company issued $350.0 million aggregate principal amount of the 2024 Notes, which form a single series and are fully fungible with the 2024 Notes issued in February 2016. In March 2011, the Company issued $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 "2019 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 June 30, 2016 , 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. Borrowing 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 June 30, 2016 , 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 by 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. Beginning in 2014 and through 2015, 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 second quarter of 2016. Pursuant to the financing arrangements for the sale of receivables, the Company sold net receivables of $9.2 million and $14.1 million during the three and six months ended June 30, 2016 , respectively, and $11.8 million and $58.9 million during the three and six months ended June 30, 2015 , respectively. The Company received cash proceeds from the financing provider of $9.1 million and $10.8 million during the three and six months ended June 30, 2016 , respectively, and $25.5 million and $85.5 million during the three and six months ended June 30, 2015 , respectively. As of June 30, 2016 and December 31, 2015 , the amounts owed by the financing provider were $4.5 million and $1.2 million , respectively, and were recorded in accounts receivable on the Condensed Consolidated Balance Sheets.

Equity

Equity	6 Months Ended
	Jun. 30, 2016
Stockholders' Equity Note [Abstract]
Equity	Equity Cash Dividends on Shares of Common Stock During the six months ended June 30, 2016 , the Company declared quarterly cash dividends of $0.10 per share of common stock on January 27, 2016 and on April 28, 2016, which were paid on March 22, 2016 and on June 22, 2016, respectively, to stockholders of record on March 1, 2016 and June 1, 2016, respectively, in the aggregate amount of $76.4 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 Networks or authorized committee thereof. See Note 16, Subsequent Events, for discussion of the Company's dividend declaration subsequent to June 30, 2016 . 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 June 30, 2016 , there was $332.1 million of authorized funds remaining under the 2014 Stock Repurchase Program. 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. The following table summarizes the Company's repurchases and retirements of its common stock under its stock repurchase program and repurchases associated with minimum tax withholdings (in millions, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Repurchases Under Stock Repurchase Program Shares repurchased 5.5 23.2 8.6 40.6 Average price per share $ 23.08 $ 25.83 $ 23.37 $ 24.64 Amount repurchased $ 125.5 $ 600.0 $ 200.5 $ 1,000.0 Repurchases for Tax Withholding Shares repurchased 0.1 0.1 0.4 0.2 Average price per share $ 23.31 $ 25.91 $ 24.64 $ 24.80 Amount repurchased $ 1.2 $ 2.3 $ 9.6 $ 4.7 Future share repurchases under the Company’s stock repurchase programs 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. The Company's stock repurchase programs may be discontinued at any time. See Note 16, Subsequent Events, for discussion of the Company's stock repurchase activity subsequent to June 30, 2016 . Accumulated Other Comprehensive Loss, Net of Tax The components of accumulated other comprehensive loss, net of related taxes, during the six months ended June 30, 2016 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, 2015 $ 17.0 $ (1.3 ) $ (34.9 ) $ (19.2 ) Other comprehensive gain before reclassifications 6.0 3.9 5.8 15.7 Amount reclassified from accumulated other comprehensive loss (0.8 ) (0.1 ) — (0.9 ) Other comprehensive gains, net 5.2 3.8 5.8 14.8 Balance as of June 30, 2016 $ 22.2 $ 2.5 $ (29.1 ) $ (4.4 ) ________________________________ (1) The reclassifications out of accumulated other comprehensive loss during the six months ended June 30, 2016 for realized gains on available-for-sale securities of $0.8 million are included in other expense, net, in the Condensed Consolidated Statements of Operations. (2) The reclassifications out of accumulated other comprehensive loss during the six months ended June 30, 2016 for realized gains on cash flow hedges are included within research and development of $0.1 million , sales and marketing of $0.1 million , and an immaterial realized loss in general and administrative, and for realized losses within cost of revenues of $0.1 million for which the hedged transactions relate in the Condensed Consolidated Statements of Operations.

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2016
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”) and the 2008 Employee Stock Purchase Plan (the “ESPP”). Under these plans, the Company has granted stock options, restricted stock units (“RSUs”), restricted stock awards (“RSAs”), and performance share awards (“PSAs”). In addition, in connection with certain past acquisitions, the Company has assumed stock options, RSUs, RSAs, and PSAs under the stock plans of the acquired companies and exchanged the assumed awards for the Company's stock options, RSUs, RSAs, and PSAs, respectively. 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 June 30, 2016 , an aggregate of 20.4 million shares were subject to outstanding equity awards under the 2015 Plan and the 2006 Plan, and no shares were subject to outstanding equity awards under the 1996 Plan. As of June 30, 2016 , 22.9 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 June 30, 2016 , approximately 19.7 million shares have been issued and 6.3 million shares remain available for future issuance under the ESPP. On April 1, 2016, the Company completed the acquisition of BTI Systems Inc. In connection with the acquisition, the Company assumed RSUs and PSAs that had been granted under the BTI Systems Inc. Amended and Restated 2012 Stock Option Plan and Long-Term Incentive Plan (the "BTI Plan") and converted the awards for Juniper Networks' RSUs and PSAs, respectively, based on an exchange ratio set forth in the acquisition agreement between Juniper and BTI. The Company assumed an aggregate of 0.4 million shares of RSUs and PSAs in connection with the acquisition of BTI Systems Inc. No additional awards can be granted under the BTI Plan. As of June 30, 2016 , stock options, RSUs, RSAs, and PSAs representing approximately 1.2 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 six months ended June 30, 2016 (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, 2015 3.6 $ 27.52 Exercised (0.4 ) 14.10 Expired (0.2 ) 33.80 Balance as of June 30, 2016 3.0 $ 28.98 1.8 $ 7.3 As of June 30, 2016: Vested and expected-to-vest options 3.0 $ 28.99 1.8 $ 7.2 Exercisable options 3.0 $ 29.37 1.7 $ 6.4 The aggregate intrinsic value represents the difference between the Company’s closing stock price on the last trading day of the period, which was $22.49 per share as of June 30, 2016 , 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 $0.4 million and $4.3 million for the three and six months ended June 30, 2016 , 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 six months ended June 30, 2016 (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, 2015 18.6 $ 22.71 RSUs granted (1)(3) 6.9 24.68 RSUs assumed 0.2 24.76 PSAs granted (2)(3) 0.7 23.62 PSAs assumed 0.2 25.09 RSUs vested (5.5 ) 22.37 RSAs vested (0.8 ) 20.76 PSAs vested (0.6 ) 21.61 RSUs canceled (0.7 ) 23.15 PSAs canceled (0.4 ) 21.81 Balance as of June 30, 2016 18.6 $ 23.73 1.4 $ 419.3 ________________________________ (1) Includes service-based and market-based RSUs granted under the 2015 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 0.7 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 April 28, 2016, the Company declared a cash dividend of $0.10 per share of common stock, or $38.1 million in the aggregate, to stockholders of record on June 1, 2016, which was paid on June 22, 2016. 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 1.4 million shares of common stock through the ESPP at an average exercise price of $20.06 and $19.32 per share for the six months ended June 30, 2016 and June 30, 2015 , respectively. No stock purchases under the ESPP were made during the three months ended June 30, 2016 and June 30, 2015 . Valuation Assumptions There were no market-based RSUs granted or stock purchases under the ESPP during the three months ended June 30, 2016 and June 30, 2015 . The weighted-average assumptions used and the resulting estimates of fair value for ESPP and market-based RSUs during the six months ended June 30, 2016 and June 30, 2015 were as follows: Six Months Ended June 30, 2016 2015 ESPP (1) : Volatility 35% 30% Risk-free interest rate 0.5% 0.1% Expected life (years) 0.5 0.5 Dividend yield 1.7% 1.9% Weighted-average fair value per share $5.95 $5.23 Market-based RSUs (2) : Volatility 36% 34% Risk-free interest rate 1.2% 1.4% Dividend yield 1.7% 1.8% Weighted-average fair value per share $14.71 $14.97 ________________________________ (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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of revenues - Product $ 1.5 $ 1.5 $ 3.4 $ 3.2 Cost of revenues - Service 4.3 3.8 7.8 7.2 Research and development 29.5 32.5 61.8 63.2 Sales and marketing 13.8 13.4 23.2 19.2 General and administrative 6.5 7.7 11.2 12.1 Total $ 55.6 $ 58.9 $ 107.4 $ 104.9 The following table summarizes share-based compensation expense by award type (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock options $ 1.1 $ 1.5 $ 2.3 $ 3.7 RSUs, RSAs, and PSAs 50.4 53.3 97.2 93.9 ESPP 4.1 4.1 7.9 7.3 Total $ 55.6 $ 58.9 $ 107.4 $ 104.9 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 June 30, 2016 (in millions, except years): Unrecognized Compensation Cost Weighted Average Period (In Years) Stock options $ 0.3 0.3 RSUs, RSAs, and PSAs $ 252.0 1.9

Segments

Segments	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segments	Segments The Company conducts business globally and is managed, operated and organized by major functional departments that operate on a consolidated basis. Each major functional leader reports directly to the Company's chief executive officer, who is the chief operating decision maker (“CODM”). The Company's CODM views the business, allocates resources and assesses the performance of the Company primarily based on consolidated financial information for the entire business, accompanied by disaggregated information about net revenues by product and service and geographic region as presented below. As a result, the Company operates in one reportable segment. The following table presents net revenues by product and service (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Routing $ 574.7 $ 602.4 $ 1,078.8 $ 1,107.2 Switching 209.2 190.2 384.7 356.7 Security 78.2 107.1 151.6 199.9 Total product 862.1 899.7 1,615.1 1,663.8 Total service 359.2 322.5 704.1 625.8 Total $ 1,221.3 $ 1,222.2 $ 2,319.2 $ 2,289.6 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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Americas: United States $ 661.3 $ 670.6 $ 1,240.3 $ 1,204.1 Other 58.7 65.2 107.9 120.7 Total Americas 720.0 735.8 1,348.2 1,324.8 Europe, Middle East, and Africa 300.1 316.3 585.5 620.1 Asia Pacific 201.2 170.1 385.5 344.7 Total $ 1,221.3 $ 1,222.2 $ 2,319.2 $ 2,289.6 No customer accounted for greater than 10% or more of the Company's net revenues during the three and six months ended June 30, 2016 and June 30, 2015 , respectively. The following table presents geographic information for property and equipment, net and purchased intangible assets, net (in millions): As of June 30, December 31, United States $ 996.2 $ 925.5 International 139.5 129.4 Property and equipment, net and purchased intangible assets, net $ 1,135.7 $ 1,054.9 The Company tracks assets by physical location. The majority of the Company’s assets, excluding cash and cash equivalents and investments, as of June 30, 2016 and December 31, 2015 , were attributable to U.S. operations.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company's effective tax rate for the three and six months ended June 30, 2016 of 27.2% and 27.4% , respectively, differs from the federal statutory rate of 35% primarily due to the benefit of the Section 199 deduction for U.S. production activities, the federal research and development (“R&D”) credit, and earnings in foreign jurisdictions, which are subject to lower tax rates. The effective tax rate differs from the rate for the same periods in 2015 due to the impact of the discrete items referenced in the table below, a change in the tax treatment of share-based compensation in the Company's cost-sharing arrangement, which occurred in the three months ended September 30, 2015, and the benefit of the federal R&D credit, which was permanently reinstated on December 18, 2015. The Company's effective tax rate for the three and six months ended June 30, 2015 of 30.1% and 30.4% , respectively, differs from the federal statutory rate of 35% primarily due to the benefit of the Section 199 deduction for U.S. production activities and earnings in foreign jurisdictions, which are subject to lower tax rates, and the impact of the discrete items referenced in the table below. The effective tax rates for the three and six months ended June 30, 2016 and June 30, 2015 include the tax expense (benefit) of the following discrete items (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Equity investments $ 0.6 $ — $ (1.3 ) $ — Restructuring charges $ — $ 0.2 $ — $ (1.1 ) Acquisition-related charges $ (3.1 ) $ — $ (3.1 ) $ — As of June 30, 2016 , the total amount of gross unrecognized tax benefits was $215.5 million , of which $185.2 million , if recognized, would affect the Company's effective tax rate. As a result of the closure of the California Franchise Tax Board (“FTB”) audit discussed below, the gross unrecognized tax benefits was reduced by approximately $14.3 million . 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 $3.9 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. In March 2016, the IRS concluded its field audit and issued a final assessment. The Company is appealing this assessment. As of June 30, 2016 , the Company believes the resolution of the audits is unlikely to have a material effect on its consolidated financial condition or results of operations. In June 2016, the California FTB concluded its audit of the 2004 through 2006 tax years and issued a final assessment which has no material impact on the Company’s financial statements. The Company is no longer subject to an audit of its California income taxes through tax year 2006. The Company is also subject to separate ongoing examinations by the India tax authorities for the 2003 tax year, 2004 through 2008 tax years, and the 2009 through 2011 tax years. As of as of June 30, 2016, the Company is not aware of any other examinations by tax authorities in any other major jurisdictions in which it files income tax returns. 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.

Net Income Per Share

Net Income Per Share	6 Months Ended
	Jun. 30, 2016
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net income $ 140.0 $ 158.0 $ 231.4 $ 238.2 Denominator: Weighted-average shares used to compute basic net income per share 382.8 389.9 383.0 398.4 Dilutive effect of employee stock awards 3.5 7.3 5.6 7.7 Weighted-average shares used to compute diluted net income per share 386.3 397.2 388.6 406.1 Net income per share Basic $ 0.37 $ 0.41 $ 0.60 $ 0.60 Diluted $ 0.36 $ 0.40 $ 0.60 $ 0.59 Anti-dilutive: Potential anti-dilutive shares 8.0 3.7 2.7 4.8 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	6 Months Ended
	Jun. 30, 2016
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 March 20, 2026 . 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 $129.4 million as of June 30, 2016 . Rent expense was $10.5 million and $19.6 million for the three and six months ended June 30, 2016 , respectively, and $10.9 million and $22.4 million for the three and six months ended June 30, 2015 , 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 was deemed the owner of the property during the construction period and capitalized construction in progress and recorded a corresponding long-term liability for build-to-suit lease agreements. As of December 31, 2015, the Company capitalized construction costs by recording a build-to-suit lease asset under construction in progress of $45.6 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. During the six months ended June 30, 2016, the Company increased the build-to-suit asset and financing liability by $15.3 million for construction costs incurred. Upon the completion of construction in April 2016, the Company assessed whether these arrangements qualify for sales recognition under the sale-leaseback accounting guidance. The Company concluded that it had a certain form of continuing economic involvement in the facility, which precluded sale-leaseback accounting treatment. As a result, a total of $60.9 million of costs capitalized were placed in service and will be depreciated over the lease term. Purchase Commitments with Contract Manufacturers and Suppliers In order to reduce manufacturing lead times and in the interest of having access to 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 $578.0 million as of June 30, 2016 . 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 June 30, 2016 , the Company had accrued $19.7 million based on its estimate of such charges. Debt and Interest Payment on Debt As of June 30, 2016 , the Company held long-term debt consisting of the Notes with a carrying value of $2,132.5 million . Of these Notes, $350.0 million will mature in 2019 and bears interest at a fixed rate of 3.125% , $300.0 million will mature in 2020 and bears interest at a fixed rate of 3.30% , $300.0 million will mature in 2021 and bears interest at a fixed rate of 4.60% , $500.0 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 long-term debt. Other Contractual Obligations As of June 30, 2016 , other contractual obligations primarily consisted of (1) $85.3 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 2016; (2) $3.5 million in campus build-out obligations; and (3) $42.1 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 June 30, 2016 , the Company had $199.8 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 June 30, 2016 , the Company recorded a $16.8 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 June 30, 2016 and December 31, 2015 , the Company had $6.4 million and $15.8 million , respectively, in financing arrangements, bank guarantees, and standby letters of credit related to these financial guarantees. 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 the Company or the Company could agree to settle. In such event, the Company could be required to pay substantial fines and sanctions and/or implement additional remedial measures; in addition, it may be determined that the Company violated the FCPA. Other Litigation In addition to the investigations discussed above, the Company is involved in other disputes, litigations, and legal proceedings. The Company intends to aggressively defend itself in these matters, and while there can be no assurances and the outcome of these matters is currently not determinable, the Company currently believes that none of these existing claims or proceedings are likely to have a material adverse effect on its financial position. Notwithstanding the foregoing, there are many uncertainties associated with any litigation and these matters 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. The Company records an accrual for loss contingencies for legal proceedings when it believes that an unfavorable outcome is both (a) probable and (b) the amount or range of any possible loss is reasonably estimable. The Company has not recorded any accrual for loss contingencies associated with such legal proceedings or the investigations discussed above. However, the Company has accrued for unrecognized tax benefits in connection with certain tax-related proceedings as described in further detail in Note 13, Incomes Taxes .

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Business Combination In July 2016, the Company entered into a definitive agreement to acquire Aurrion, Inc. ("Aurrion"), an innovator in fabless wafer scale silicon photonic technology, for approximately $165 million in consideration, subject to adjustment for indebtedness and working capital. The Company believes the acquisition will help to fuel its long-term competitive advantage by enabling cost-effective, high-density, high-speed optical networks. The consummation of this acquisition is subject to customary closing conditions. Dividend Declaration On July 26, 2016, the Company announced that it had declared a cash dividend of $0.10 per share of common stock payable on September 22, 2016 to stockholders of record as of the close of business on September 1, 2016. Stock Repurchase Activities Subsequent to June 30, 2016 , through the filing of this Report, the Company repurchased 0.9 million shares of its common stock, for an aggregate of $20.0 million at an average purchase price of $22.42 per share, under the 2014 Stock Repurchase Program. These shares will be settled after the filing date. Under the 2014 Stock Repurchase Program, the Company has $312.1 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)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
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. 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 six months ended June 30, 2016 , are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 , or any future period. The Condensed Consolidated Balance Sheet as of June 30, 2016 , has been derived from the audited Consolidated Financial Statements for the year ended December 31, 2015 but does not include all of the information and footnotes required by GAAP for complete financial statements. 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, 2015 .
Recent accounting pronouncements	Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-13 (Topic 326) Financial Instruments - Credit Losses. The pronouncement was issued to provide more decision-useful information about the expected credit losses on financial instruments and changes the loss impairment methodology. This pronouncement is effective for reporting periods beginning after December 15, 2019, and interim periods within those fiscal years, using a modified retrospective adoption method. A prospective transition approach is required for debt securities for which an other-than-temporary impairment had been recognized. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-09 (Topic 718) Compensation—Stock Compensation: Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"), which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, forfeiture, statutory tax withholding requirements, and classification on the statement of cash flows. ASU-2016-09 is effective for interim and annual reporting periods beginning after December 15, 2016. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-07 (Topic 323) Investments—Equity Method and Joint Ventures: Simplifying the Transition to the Equity Method of Accounting ("ASU 2016-07"), which eliminates the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. This update requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. Therefore, upon qualifying for the equity method of accounting, no retroactive adjustment of the investment is required. This update requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive loss at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In March 2016, the FASB issued ASU No. 2016-06 (Topic 815) Derivatives and Hedging: Contingent Put and Call Options in Debt Instruments ("ASU 2016-06"), which requires that embedded derivatives be separated from the host contract and accounted for separately as derivatives if certain criteria are met. One of those criteria is that the economic characteristics and risks of the embedded derivatives are not clearly and closely related to the economic characteristics and risks of the host contract (the “clearly and closely related” criterion). In addition, in March 2016, the FASB issued ASU No. 2016-05 (Topic 815), Derivatives and Hedging: Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships, ("ASU 2016-05"), which clarifies that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument under Topic 815 does not, in and of itself, require dedesignation of that hedging relationship provided that all other hedge accounting criteria continue to be met. ASU 2016-06 and ASU 2016-05 are effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In February 2016, the FASB issued ASU No. 2016-02 (Topic 842), Leases ("ASU 2016-02"), which requires recognition of lease assets and lease liabilities on the balance sheet by the lessees for lease contracts with a lease term of more than twelve months. ASU 2016-02 should be applied on a modified retrospective basis and is effective for financial statements issued for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact that this standard will have on its Consolidated Financial Statements and disclosures. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), which requires equity investments to be measured at fair value with changes in fair value recognized in net income and simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. Entities may choose a practical expedient, to estimate the fair value of certain equity securities that do not have readily determinable fair value. If the practical expedient is elected, these investments would be recorded at cost, less impairment and subsequently adjusted for observable price changes. The guidance also updates certain presentation and disclosure requirements. ASU 2016-01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is not permitted. The Company is currently evaluating the impact that ASU 2016-01will have on its Consolidated Financial Statements and disclosures. In July 2015, the FASB issued ASU No. 2015-11 (Subtopic 330) - Simplifying the Measurement of Inventory ("ASU 2015-11"), 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 adoption of this standard will not have a significant impact on the Company's 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. Accordingly, the ASU will be effective for the Company beginning fiscal year 2018. In addition, in March 2016, the FASB issued ASU No. 2016-08 (Topic 606) Revenue from Contracts with Customers: Principal versus Agent Considerations (Reporting Revenue Gross versus Net) (“ASU 2016-08”) , which clarifies the principal-versus-agent guidance in Topic 606 and requires an entity to determine whether the nature of its promise to provide goods or services to a customer is performed in a principal or agent capacity and to recognize revenue in a gross or net manner based on its principal/agent designation. In April 2016, the FASB also issued ASU No. 2016-10 (Topic 606) Revenue from Contracts with Customers: Identifying Performance Obligations and Licensing (“ASU 2016-10”), which amends the revenue guidance on identifying performance obligations and accounting for licenses of intellectual property. In May 2016, the FASB also issued ASU No. 2016-12 (Topic 606) Revenue from Contracts with Customers: Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”), which amends the revenue guidance to clarify measurement and presentation as well as to include some practical expedients and policy elections. There are two transition methods available under the new standard, either cumulative effect or retrospective. ASU 2016-08, ASU 2016-10, and ASU 2016-12 must be adopted concurrently with the adoption of ASU 2014-09. The Company is currently evaluating the impact of the adoption of this standard on its Consolidated Financial Statements and disclosures.

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The aggregate value of $44.1 million , consisting of cash consideration of $26.1 million and $18.0 million for the fair value of the previous investments in BTI was allocated as follows (in millions): Net tangible liabilities assumed $ (19.5 ) Intangible assets acquired 43.3 Goodwill 20.3 Total $ 44.1
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The following table presents details of the Company's intangible assets acquired through the business combination completed during the three months and six months ended June 30, 2016 (in millions, except years): Weighted Average Estimated Useful Life (In Years) Amount Existing technology 8 $ 37.1 Customer relationships 8 5.3 Trade name 1 0.6 Backlog 1 0.3 Total $ 43.3

Cash Equivalents and Investme26

Cash Equivalents and Investments (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 and December 31, 2015 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value As of June 30, 2016 Fixed income securities: Asset-backed securities $ 320.3 $ 0.4 $ — $ 320.7 Certificates of deposit 19.4 — — 19.4 Commercial paper 6.7 — — 6.7 Corporate debt securities 861.3 3.0 (0.6 ) 863.7 Foreign government debt securities 35.5 — — 35.5 Government-sponsored enterprise obligations 177.1 0.1 — 177.2 U.S. government securities 366.2 0.5 — 366.7 Total fixed income securities 1,786.5 4.0 (0.6 ) 1,789.9 Money market funds 538.7 — — 538.7 Mutual funds 5.8 — — 5.8 Publicly-traded equity securities 6.2 — (1.7 ) 4.5 Total available-for-sale securities 2,337.2 4.0 (2.3 ) 2,338.9 Trading securities in mutual funds (*) 19.3 — — 19.3 Total $ 2,356.5 $ 4.0 $ (2.3 ) $ 2,358.2 Reported as: Cash equivalents $ 555.2 $ — $ — $ 555.2 Restricted investments 68.8 — — 68.8 Short-term investments 588.5 0.4 (1.8 ) 587.1 Long-term investments 1,144.0 3.6 (0.5 ) 1,147.1 Total $ 2,356.5 $ 4.0 $ (2.3 ) $ 2,358.2 ________________________________ (*) 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, 2015 Fixed income securities: Asset-backed securities $ 312.2 $ — $ (0.5 ) $ 311.7 Certificates of deposit 9.6 — — 9.6 Commercial paper 17.7 — — 17.7 Corporate debt securities 913.8 0.2 (2.6 ) 911.4 Foreign government debt securities 16.5 — — 16.5 Government-sponsored enterprise obligations 204.1 — (0.4 ) 203.7 U.S. government securities 278.0 — (0.4 ) 277.6 Total fixed income securities 1,751.9 0.2 (3.9 ) 1,748.2 Money market funds 29.7 — — 29.7 Mutual funds 6.1 0.1 — 6.2 Publicly-traded equity securities 8.7 0.8 (0.7 ) 8.8 Total available-for-sale securities 1,796.4 1.1 (4.6 ) 1,792.9 Trading securities in mutual funds (*) 17.7 — — 17.7 Total $ 1,814.1 $ 1.1 $ (4.6 ) $ 1,810.6 Reported as: Cash equivalents $ 3.4 $ — $ — $ 3.4 Restricted investments 35.8 0.1 — 35.9 Short-term investments 527.2 0.9 (1.0 ) 527.1 Long-term investments 1,247.7 0.1 (3.6 ) 1,244.2 Total $ 1,814.1 $ 1.1 $ (4.6 ) $ 1,810.6 ________________________________ (*) 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 June 30, 2016 (in millions): Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Due in less than one year $ 642.4 $ 0.4 $ (0.1 ) $ 642.7 Due between one and five years 1,144.1 3.6 (0.5 ) 1,147.2 Total $ 1,786.5 $ 4.0 $ (0.6 ) $ 1,789.9
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 June 30, 2016 and December 31, 2015 (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 June 30, 2016 Fixed income securities: Asset-backed securities (1)(2) $ 82.4 $ — $ 12.4 $ — $ 94.8 $ — Certificates of deposit (2) 3.3 — — — 3.3 — Corporate debt securities 153.9 (0.3 ) 93.8 (0.3 ) 247.7 (0.6 ) Foreign government debt securities (2) 13.5 — — — 13.5 — Government-sponsored enterprise obligations (2) 23.0 — — — 23.0 — U.S. government securities (2) 17.2 — — — 17.2 — Total fixed income securities 293.3 (0.3 ) 106.2 (0.3 ) 399.5 (0.6 ) Publicly-traded equity securities 4.5 (1.7 ) — — 4.5 (1.7 ) Total available-for-sale securities $ 297.8 $ (2.0 ) $ 106.2 $ (0.3 ) $ 404.0 $ (2.3 ) ________________________________ (1) Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of June 30, 2016 . (2) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of June 30, 2016 . 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, 2015 Fixed income securities: Asset-backed securities $ 274.2 $ (0.4 ) $ 30.8 $ (0.1 ) $ 305.0 $ (0.5 ) Certificates of deposit (*) 3.3 — — — $ 3.3 — Corporate debt securities 687.9 (2.3 ) 58.9 (0.3 ) 746.8 (2.6 ) Foreign government debt securities (*) 9.5 — — — 9.5 — Government-sponsored enterprise obligations 185.3 (0.4 ) — — 185.3 (0.4 ) U.S. government securities 259.3 (0.4 ) — — 259.3 (0.4 ) Total fixed income securities 1,419.5 (3.5 ) 89.7 (0.4 ) 1,509.2 (3.9 ) Publicly-traded equity securities 2.1 (0.7 ) — — 2.1 (0.7 ) Total available-for-sale securities $ 1,421.6 $ (4.2 ) $ 89.7 $ (0.4 ) $ 1,511.3 $ (4.6 ) ________________________________ (*) Balances less than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2015 .

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 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 $ — $ 320.7 $ — $ 320.7 Certificates of deposit — 19.4 — 19.4 Commercial paper — 6.7 — 6.7 Corporate debt securities — 863.7 — 863.7 Foreign government debt securities — 35.5 — 35.5 Government-sponsored enterprise obligations — 177.2 — 177.2 Money market funds (1) 538.7 — — 538.7 Mutual funds (2) 5.8 — — 5.8 Publicly-traded equity securities 4.5 — — 4.5 U.S. government securities 295.5 71.2 — 366.7 Total available-for-sale securities 844.5 1,494.4 — 2,338.9 Trading securities in mutual funds (3) 19.3 — — 19.3 Privately-held debt and redeemable preferred stock securities — — 51.4 51.4 Derivative assets: Foreign exchange contracts — 2.8 — 2.8 Total assets measured at fair value $ 863.8 $ 1,497.2 $ 51.4 $ 2,412.4 Liabilities measured at fair value: Derivative liabilities: Foreign exchange contracts $ — $ (0.3 ) $ — $ (0.3 ) Total liabilities measured at fair value $ — $ (0.3 ) $ — $ (0.3 ) Total assets measured at fair value, reported as: Cash equivalents $ 495.0 $ 60.2 $ — $ 555.2 Restricted investments 68.8 — — 68.8 Short-term investments 122.4 464.7 — 587.1 Long-term investments 177.6 969.5 — 1,147.1 Prepaid expenses and other current assets — 2.8 — 2.8 Other long-term assets — — 51.4 51.4 Total assets measured at fair value $ 863.8 $ 1,497.2 $ 51.4 $ 2,412.4 Total liabilities measured at fair value, reported as: Other accrued liabilities $ — $ (0.3 ) $ — $ (0.3 ) Total liabilities measured at fair value $ — $ (0.3 ) $ — $ (0.3 ) ________________________________ (1) Balance includes $43.7 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 restricted investments measured at fair value related to the Company's NQDC plan assets. Fair Value Measurements at December 31, 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 $ — $ 311.7 $ — $ 311.7 Certificates of deposit — 9.6 — 9.6 Commercial paper — 17.7 — 17.7 Corporate debt securities — 911.4 — 911.4 Foreign government debt securities — 16.5 — 16.5 Government-sponsored enterprise obligations — 203.7 — 203.7 Money market funds (1) 29.7 — — 29.7 Mutual funds (2) 6.2 — — 6.2 Publicly-traded equity securities 8.8 — — 8.8 U.S. government securities 247.3 30.3 — 277.6 Total available-for-sale securities 292.0 1,500.9 — 1,792.9 Trading securities in mutual funds (3) 17.7 — — 17.7 Privately-held debt and redeemable preferred stock securities — — 60.2 60.2 Derivative assets: Foreign exchange contracts — 0.4 — 0.4 Total assets measured at fair value $ 309.7 $ 1,501.3 $ 60.2 $ 1,871.2 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 $ — $ 3.4 $ — $ 3.4 Restricted investments 35.9 — — 35.9 Short-term investments 108.2 418.9 — 527.1 Long-term investments 165.6 1,078.6 — 1,244.2 Prepaid expenses and other current assets — 0.4 — 0.4 Other long-term assets — — 60.2 60.2 Total assets measured at fair value $ 309.7 $ 1,501.3 $ 60.2 $ 1,871.2 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 NQDC plan assets.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, December 31, Cash flow hedges $ 136.4 $ 116.8 Non-designated derivatives — 71.8 Total $ 136.4 $ 188.6

Goodwill and Purchased Intang29

Goodwill and Purchased Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	The following table presents goodwill activity during the six months ended June 30, 2016 (in millions): Balance as of December 31, 2015 $ 2,981.3 Additions due to business combination 20.3 Balance as of June 30, 2016 $ 3,001.6
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 June 30, 2016 Intangible assets with finite lives: Technologies and patents $ 604.8 $ (498.1 ) $ (49.9 ) $ 56.8 Customer contracts, support agreements, and related relationships 83.4 (69.2 ) (2.8 ) 11.4 Other 2.0 (1.1 ) — 0.9 Total purchased intangible assets $ 690.2 $ (568.4 ) $ (52.7 ) $ 69.1 As of December 31, 2015 Intangible assets with finite lives: Technologies and patents $ 567.7 $ (491.8 ) $ (49.9 ) $ 26.0 Customer contracts, support agreements, and related relationships 78.1 (67.8 ) (2.8 ) 7.5 Other 1.1 (0.7 ) — 0.4 Total purchased intangible assets $ 646.9 $ (560.3 ) $ (52.7 ) $ 33.9
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of revenues $ 3.6 $ 4.7 $ 6.0 $ 15.5 Operating expenses: Sales and marketing 0.8 0.6 1.3 1.4 General and administrative 0.4 0.3 0.8 0.7 Total operating expenses 1.2 0.9 2.1 2.1 Total $ 4.8 $ 5.6 $ 8.1 $ 17.6
Estimated future amortization expense of purchased intangible assets with finite lives	As of June 30, 2016 , the estimated future amortization expense of purchased intangible assets with finite lives is as follows (in millions): Years Ending December 31, Amount Remainder of 2016 $ 8.1 2017 12.5 2018 10.4 2019 10.2 2020 10.1 Thereafter 17.8 Total $ 69.1

Other Financial Information (Ta

Other Financial Information (Tables)	6 Months Ended
	Jun. 30, 2016
Other Financial Information [Abstract]
Inventories	Total inventories consisted of the following (in millions): As of June 30, December 31, Production materials $ 82.4 $ 61.9 Finished goods 28.1 13.1 Inventories $ 110.5 $ 75.0
Other long-term assets	Other long-term assets consisted of the following (in millions): As of June 30, December 31, Privately-held investments $ 88.5 $ 102.4 Licensed software 6.2 7.1 Federal income tax receivable 40.8 28.9 Inventory 5.6 8.4 Prepaid costs, deposits, and other (*) 47.2 43.3 Deferred tax asset 13.2 55.9 Promissory note in connection with the sale of Junos Pulse 57.9 132.9 Other long-term assets $ 259.4 $ 378.9 ________________________________ (*) During the six months ended June 30, 2016, the Company adopted ASU 2015-03. As a result, debt issuance costs included in prepaid costs, deposits, and other were reclassified to long-term debt as of December 31, 2015 to conform to the current-year presentation.
Warranties	Changes in the Company’s warranty reserve during the six months ended June 30, 2016 were as follows (in millions): Balance as of December 31, 2015 $ 28.4 Provisions made during the period 13.6 Actual costs incurred during the period (13.5 ) Balance as of June 30, 2016 $ 28.5
Deferred revenue	Details of the Company's deferred revenue, as reported in the Condensed Consolidated Balance Sheets, were as follows (in millions): As of June 30, December 31, Deferred product revenue: Undelivered product commitments and other product deferrals $ 242.5 $ 210.1 Distributor inventory and other sell-through items 99.9 81.8 Deferred gross product revenue 342.4 291.9 Deferred cost of product revenue (51.6 ) (51.6 ) Deferred product revenue, net 290.8 240.3 Deferred service revenue 1,004.8 927.8 Total $ 1,295.6 $ 1,168.1 Reported as: Current $ 933.0 $ 822.9 Long-term 362.6 345.2 Total $ 1,295.6 $ 1,168.1
Other income (expense), net	Other expense, net, consisted of the following (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Interest income $ 8.5 $ 6.7 $ 16.4 $ 10.5 Interest expense (25.0 ) (21.8 ) (47.5 ) (40.3 ) Gain (loss) on investments 3.6 0.2 (1.8 ) 0.8 Other 1.3 (2.2 ) (0.9 ) (3.9 ) Other expense, net $ (11.6 ) $ (17.1 ) $ (33.8 ) $ (32.9 )

Debt and Financing (Tables)

Debt and Financing (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Instruments [Abstract]
Long-term debt	The following table summarizes the Company's long-term debt (in millions, except percentages): As of June 30, 2016 Amount Effective Interest Rates Senior Notes: 3.125% fixed-rate notes, due February 2019 $ 350.0 3.36 % 3.300% fixed-rate notes, due June 2020 300.0 3.47 % 4.600% fixed-rate notes, due March 2021 300.0 4.69 % 4.500% fixed-rate notes, due March 2024, issued March 2014 350.0 4.63 % 4.500% fixed-rate notes, due March 2024, issued February 2016 150.0 4.87 % 4.350% fixed-rate notes, due June 2025 300.0 4.47 % 5.950% fixed-rate notes, due March 2041 400.0 6.03 % Total senior notes 2,150.0 Unaccreted discount and debt issuance costs (17.5 ) Total $ 2,132.5

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2016
Stockholders' Equity Note [Abstract]
Schedule of Repurchase Agreements	The following table summarizes the Company's repurchases and retirements of its common stock under its stock repurchase program and repurchases associated with minimum tax withholdings (in millions, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Repurchases Under Stock Repurchase Program Shares repurchased 5.5 23.2 8.6 40.6 Average price per share $ 23.08 $ 25.83 $ 23.37 $ 24.64 Amount repurchased $ 125.5 $ 600.0 $ 200.5 $ 1,000.0 Repurchases for Tax Withholding Shares repurchased 0.1 0.1 0.4 0.2 Average price per share $ 23.31 $ 25.91 $ 24.64 $ 24.80 Amount repurchased $ 1.2 $ 2.3 $ 9.6 $ 4.7
Components of accumulated other comprehensive income, net of taxes	The components of accumulated other comprehensive loss, net of related taxes, during the six months ended June 30, 2016 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, 2015 $ 17.0 $ (1.3 ) $ (34.9 ) $ (19.2 ) Other comprehensive gain before reclassifications 6.0 3.9 5.8 15.7 Amount reclassified from accumulated other comprehensive loss (0.8 ) (0.1 ) — (0.9 ) Other comprehensive gains, net 5.2 3.8 5.8 14.8 Balance as of June 30, 2016 $ 22.2 $ 2.5 $ (29.1 ) $ (4.4 ) ________________________________ (1) The reclassifications out of accumulated other comprehensive loss during the six months ended June 30, 2016 for realized gains on available-for-sale securities of $0.8 million are included in other expense, net, in the Condensed Consolidated Statements of Operations. (2) The reclassifications out of accumulated other comprehensive loss during the six months ended June 30, 2016 for realized gains on cash flow hedges are included within research and development of $0.1 million , sales and marketing of $0.1 million , and an immaterial realized loss in general and administrative, and for realized losses within cost of revenues 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)	6 Months Ended
	Jun. 30, 2016
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 six months ended June 30, 2016 (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, 2015 3.6 $ 27.52 Exercised (0.4 ) 14.10 Expired (0.2 ) 33.80 Balance as of June 30, 2016 3.0 $ 28.98 1.8 $ 7.3 As of June 30, 2016: Vested and expected-to-vest options 3.0 $ 28.99 1.8 $ 7.2 Exercisable options 3.0 $ 29.37 1.7 $ 6.4
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 six months ended June 30, 2016 (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, 2015 18.6 $ 22.71 RSUs granted (1)(3) 6.9 24.68 RSUs assumed 0.2 24.76 PSAs granted (2)(3) 0.7 23.62 PSAs assumed 0.2 25.09 RSUs vested (5.5 ) 22.37 RSAs vested (0.8 ) 20.76 PSAs vested (0.6 ) 21.61 RSUs canceled (0.7 ) 23.15 PSAs canceled (0.4 ) 21.81 Balance as of June 30, 2016 18.6 $ 23.73 1.4 $ 419.3 ________________________________ (1) Includes service-based and market-based RSUs granted under the 2015 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 0.7 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 April 28, 2016, the Company declared a cash dividend of $0.10 per share of common stock, or $38.1 million in the aggregate, to stockholders of record on June 1, 2016, which was paid on June 22, 2016.
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 six months ended June 30, 2016 and June 30, 2015 were as follows: Six Months Ended June 30, 2016 2015 ESPP (1) : Volatility 35% 30% Risk-free interest rate 0.5% 0.1% Expected life (years) 0.5 0.5 Dividend yield 1.7% 1.9% Weighted-average fair value per share $5.95 $5.23 Market-based RSUs (2) : Volatility 36% 34% Risk-free interest rate 1.2% 1.4% Dividend yield 1.7% 1.8% Weighted-average fair value per share $14.71 $14.97 ________________________________ (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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Cost of revenues - Product $ 1.5 $ 1.5 $ 3.4 $ 3.2 Cost of revenues - Service 4.3 3.8 7.8 7.2 Research and development 29.5 32.5 61.8 63.2 Sales and marketing 13.8 13.4 23.2 19.2 General and administrative 6.5 7.7 11.2 12.1 Total $ 55.6 $ 58.9 $ 107.4 $ 104.9
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Stock options $ 1.1 $ 1.5 $ 2.3 $ 3.7 RSUs, RSAs, and PSAs 50.4 53.3 97.2 93.9 ESPP 4.1 4.1 7.9 7.3 Total $ 55.6 $ 58.9 $ 107.4 $ 104.9
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 June 30, 2016 (in millions, except years): Unrecognized Compensation Cost Weighted Average Period (In Years) Stock options $ 0.3 0.3 RSUs, RSAs, and PSAs $ 252.0 1.9

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Financial information for each segment	The following table presents net revenues by product and service (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Routing $ 574.7 $ 602.4 $ 1,078.8 $ 1,107.2 Switching 209.2 190.2 384.7 356.7 Security 78.2 107.1 151.6 199.9 Total product 862.1 899.7 1,615.1 1,663.8 Total service 359.2 322.5 704.1 625.8 Total $ 1,221.3 $ 1,222.2 $ 2,319.2 $ 2,289.6
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Americas: United States $ 661.3 $ 670.6 $ 1,240.3 $ 1,204.1 Other 58.7 65.2 107.9 120.7 Total Americas 720.0 735.8 1,348.2 1,324.8 Europe, Middle East, and Africa 300.1 316.3 585.5 620.1 Asia Pacific 201.2 170.1 385.5 344.7 Total $ 1,221.3 $ 1,222.2 $ 2,319.2 $ 2,289.6
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 June 30, December 31, United States $ 996.2 $ 925.5 International 139.5 129.4 Property and equipment, net and purchased intangible assets, net $ 1,135.7 $ 1,054.9

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Schedule of effective income tax rate reconciliation	The effective tax rates for the three and six months ended June 30, 2016 and June 30, 2015 include the tax expense (benefit) of the following discrete items (in millions): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Equity investments $ 0.6 $ — $ (1.3 ) $ — Restructuring charges $ — $ 0.2 $ — $ (1.1 ) Acquisition-related charges $ (3.1 ) $ — $ (3.1 ) $ —

Net Income Per Share (Tables)

Net Income Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net income $ 140.0 $ 158.0 $ 231.4 $ 238.2 Denominator: Weighted-average shares used to compute basic net income per share 382.8 389.9 383.0 398.4 Dilutive effect of employee stock awards 3.5 7.3 5.6 7.7 Weighted-average shares used to compute diluted net income per share 386.3 397.2 388.6 406.1 Net income per share Basic $ 0.37 $ 0.41 $ 0.60 $ 0.60 Diluted $ 0.36 $ 0.40 $ 0.60 $ 0.59 Anti-dilutive: Potential anti-dilutive shares 8.0 3.7 2.7 4.8

Basis of Presentation (Details)

Basis of Presentation (Details) - Accounting Standards Update 2015-03 [Member] $ in Millions	Dec. 31, 2015USD ($)
Long-term Debt [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net	$ 11.3
Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred finance costs, net	$ (11.3)

Business Combinations (Details)

Business Combinations (Details) - BTI Systems, Inc [Member] - USD ($) $ in Millions	Apr. 01, 2016	Mar. 31, 2016	Jun. 30, 2016	Jun. 30, 2016
Business Acquisition [Line Items]
Ownership interest prior to acquisition of remaining ownership interest		12.00%
Ownership interest	100.00%
Payments to acquire business	$ 26.1
Fair value of pre-existing investment	17.1
Convertible debt held during pre-existing investment		$ 0.9
Aggregate value of acquisition including previous investment	44.1
Fair value of pre-existing investment	18
Repayment of liabilities incurred	18.6
Fair value of share-based compensation assumed	$ 8.6
Acquisition related costs			$ 1.3	$ 4.2
Restructuring charges related to employee severance			$ 2.4	$ 2.4

Business Combinations - Purchas

Business Combinations - Purchase Price Allocation (Details) - USD ($) $ in Millions	Jun. 30, 2016	Apr. 01, 2016	Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 3,001.6		$ 2,981.3
BTI Systems, Inc [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Net tangible liabilities assumed		$ (19.5)
Intangible assets acquired		43.3
Goodwill		20.3
Total		$ 44.1

Business Combinations - Intangi

Business Combinations - Intangible Assets Acquired (Details) - BTI Systems, Inc [Member] $ in Millions	Apr. 01, 2016USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Amount	$ 43.3
Existing Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Life (In Years)	8 years
Amount	$ 37.1
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Life (In Years)	8 years
Amount	$ 5.3
Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Life (In Years)	1 year
Amount	$ 0.6
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Life (In Years)	1 year
Amount	$ 0.3

Cash Equivalents and Investme41

Cash Equivalents and Investments - Available-For-Sale and Trading Securities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Available-for-sale securities:
Available-for-sale securities, amortized cost	$ 2,337.2	$ 1,796.4
Available-for-sale securities, gross unrealized gains	4	1.1
Available-for-sale securities, gross unrealized losses	(2.3)	(4.6)
Available-for-sale securities, estimated fair value	2,338.9	1,792.9
Trading securities:
Trading securities, amortized cost	19.3	17.7
Trading securities, gross unrealized gains	0	0
Trading securities, gross unrealized losses	0	0
Trading securities, estimated fair value	19.3	17.7
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	2,356.5	1,814.1
Total investments, gross unrealized gains	4	1.1
Total investments, gross unrealized losses	(2.3)	(4.6)
Total investments, estimated fair value	2,358.2	1,810.6
Cash equivalents [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	555.2	3.4
Total investments, gross unrealized gains	0	0
Total investments, gross unrealized losses	0	0
Total investments, estimated fair value	555.2	3.4
Restricted investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	68.8	35.8
Total investments, gross unrealized gains	0	0.1
Total investments, gross unrealized losses	0	0
Total investments, estimated fair value	68.8	35.9
Short-term investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	588.5	527.2
Total investments, gross unrealized gains	0.4	0.9
Total investments, gross unrealized losses	(1.8)	(1)
Total investments, estimated fair value	587.1	527.1
Long-term investments [Member]
Available-for-sale and Trading Securities [Abstract]
Total investments, amortized cost	1,144	1,247.7
Total investments, gross unrealized gains	3.6	0.1
Total investments, gross unrealized losses	(0.5)	(3.6)
Total investments, estimated fair value	1,147.1	1,244.2
Debt Securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	1,786.5	1,751.9
Available-for-sale securities, gross unrealized gains	4	0.2
Available-for-sale securities, gross unrealized losses	(0.6)	(3.9)
Available-for-sale securities, estimated fair value	1,789.9	1,748.2
Asset-backed securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	320.3	312.2
Available-for-sale securities, gross unrealized gains	0.4	0
Available-for-sale securities, gross unrealized losses	0	(0.5)
Available-for-sale securities, estimated fair value	320.7	311.7
Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	19.4	9.6
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	19.4	9.6
Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	6.7	17.7
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	6.7	17.7
Corporate debt securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	861.3	913.8
Available-for-sale securities, gross unrealized gains	3	0.2
Available-for-sale securities, gross unrealized losses	(0.6)	(2.6)
Available-for-sale securities, estimated fair value	863.7	911.4
Foreign government debt securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	35.5	16.5
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	35.5	16.5
Government-sponsored enterprise obligations [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	177.1	204.1
Available-for-sale securities, gross unrealized gains	0.1	0
Available-for-sale securities, gross unrealized losses	0	(0.4)
Available-for-sale securities, estimated fair value	177.2	203.7
US government securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	366.2	278
Available-for-sale securities, gross unrealized gains	0.5	0
Available-for-sale securities, gross unrealized losses	0	(0.4)
Available-for-sale securities, estimated fair value	366.7	277.6
Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	538.7	29.7
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	538.7	29.7
Mutual funds [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	5.8	6.1
Available-for-sale securities, gross unrealized gains	0	0.1
Available-for-sale securities, gross unrealized losses	0	0
Available-for-sale securities, estimated fair value	5.8	6.2
Publicly-traded equity securities [Member]
Available-for-sale securities:
Available-for-sale securities, amortized cost	6.2	8.7
Available-for-sale securities, gross unrealized gains	0	0.8
Available-for-sale securities, gross unrealized losses	(1.7)	(0.7)
Available-for-sale securities, estimated fair value	$ 4.5	$ 8.8

Cash Equivalents and Investme42

Cash Equivalents and Investments - Maturities of Fixed Income Investments (Details) $ in Millions	Jun. 30, 2016USD ($)
Schedule of Fixed Income Securities Maturities [Abstract]
Amortized cost due within one year	$ 642.4
Gross unrealized gains due within one year	0.4
Gross unrealized losses due within one year	(0.1)
Estimated fair value due within one year	642.7
Amortized cost due between one and five years	1,144.1
Gross unrealized gains due between one and five years	3.6
Gross unrealized losses due between one and five year	(0.5)
Estimated fair value due between one and five year	1,147.2
Total investments, amortized cost	1,786.5
Gross Unrealized Gains	4
Gross Unrealized Losses	(0.6)
Total investments, estimated fair value	$ 1,789.9

Cash Equivalents, and Investmen

Cash Equivalents, and Investments, Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)Investment	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)Investment	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)Investment
Cash Equivalents and Investments [Abstract]
Total investments in unrealized loss position | Investment	214		214		682
Privately-held investments	$ 88,500,000		$ 88,500,000		$ 102,400,000
Privately held investments at fair value	51,400,000		51,400,000		$ 60,200,000
Unrealized gain (loss) on privately-held debt securities	0	$ 0	0	$ 0
Other than temporary impairment of cost method investments	$ 0	$ 0	$ 5,100,000	$ 0

Cash Equivalents and Investme44

Cash Equivalents and Investments - Unrealized Loss on Available-for-Sale Securities (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	$ 297.8	$ 1,421.6
Unrealized loss, less than 12 months	(2)	(4.2)
Fair value, 12 months or greater	106.2	89.7
Unrealized loss, 12 months or greater	(0.3)	(0.4)
Total fair value, available-for-sale investments in continuous unrealized loss position	404	1,511.3
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(2.3)	(4.6)
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	293.3	1,419.5
Unrealized loss, less than 12 months	(0.3)	(3.5)
Fair value, 12 months or greater	106.2	89.7
Unrealized loss, 12 months or greater	(0.3)	(0.4)
Total fair value, available-for-sale investments in continuous unrealized loss position	399.5	1,509.2
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(0.6)	(3.9)
Asset-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	82.4	274.2
Unrealized loss, less than 12 months	0	(0.4)
Fair value, 12 months or greater	12.4	30.8
Unrealized loss, 12 months or greater	0	(0.1)
Total fair value, available-for-sale investments in continuous unrealized loss position	94.8	305
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	(0.5)
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	3.3	3.3
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	3.3	3.3
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	0
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	153.9	687.9
Unrealized loss, less than 12 months	(0.3)	(2.3)
Fair value, 12 months or greater	93.8	58.9
Unrealized loss, 12 months or greater	(0.3)	(0.3)
Total fair value, available-for-sale investments in continuous unrealized loss position	247.7	746.8
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	(0.6)	(2.6)
Foreign government debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	13.5	9.5
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	9.5
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	23	185.3
Unrealized loss, less than 12 months	0	(0.4)
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	23	185.3
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	(0.4)
US government securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	17.2	259.3
Unrealized loss, less than 12 months	0	(0.4)
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	17.2	259.3
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	0	(0.4)
Publicly-traded equity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value, less than 12 months	4.5	2.1
Unrealized loss, less than 12 months	(1.7)	(0.7)
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	4.5	2.1
Total unrealized loss, available-for-sale investments in continuous unrealized loss position	$ (1.7)	$ (0.7)

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Available-for-sale securities:
Available-for-sale securities	$ 2,338,900,000	$ 2,338,900,000	$ 1,792,900,000
Trading securities:
Trading securities	19,300,000	19,300,000	17,700,000
Fair Value Measurements (Textuals)
Restricted investments	43,700,000	43,700,000	29,700,000
Asset-backed Securities [Member]
Available-for-sale securities:
Available-for-sale securities	320,700,000	320,700,000	311,700,000
Certificates of deposit [Member]
Available-for-sale securities:
Available-for-sale securities	19,400,000	19,400,000	9,600,000
Commercial paper [Member]
Available-for-sale securities:
Available-for-sale securities	6,700,000	6,700,000	17,700,000
Corporate debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	863,700,000	863,700,000	911,400,000
Foreign government debt securities [Member]
Available-for-sale securities:
Available-for-sale securities	35,500,000	35,500,000	16,500,000
Government-sponsored enterprise obligations [Member]
Available-for-sale securities:
Available-for-sale securities	177,200,000	177,200,000	203,700,000
Money market funds [Member]
Available-for-sale securities:
Available-for-sale securities	538,700,000	538,700,000	29,700,000
Mutual funds [Member]
Available-for-sale securities:
Available-for-sale securities	5,800,000	5,800,000	6,200,000
Publicly-traded equity securities [Member]
Available-for-sale securities:
Available-for-sale securities	4,500,000	4,500,000	8,800,000
US government securities [Member]
Available-for-sale securities:
Available-for-sale securities	366,700,000	366,700,000	277,600,000
Privately-held debt and redeemable preferred stock securities [Member]
Available-for-sale securities:
Available-for-sale securities	1,789,900,000	1,789,900,000	1,748,200,000
Fair Value, Measurements, Recurring [Member]
Derivative assets:
Total assets measured at fair value	2,412,400,000	2,412,400,000	1,871,200,000
Liabilities measured at fair value:
Other accrued liabilities	(300,000)	(300,000)	(1,300,000)
Total liabilities measured at fair value	(300,000)	(300,000)	(1,300,000)
Cash equivalents	555,200,000	555,200,000	3,400,000
Restricted investments	68,800,000	68,800,000	35,900,000
Short-term investments	587,100,000	587,100,000	527,100,000
Long-term investments	1,147,100,000	1,147,100,000	1,244,200,000
Prepaid expenses and other current assets	2,800,000	2,800,000	400,000
Other long-term assets	51,400,000	51,400,000	60,200,000
Fair Value, Measurements, Recurring [Member] | Foreign exchange contract [Member]
Derivative assets:
Foreign exchange contracts	2,800,000	2,800,000	400,000
Liabilities measured at fair value:
Derivative liabilities	(300,000)	(300,000)	(1,300,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Derivative assets:
Total assets measured at fair value	863,800,000	863,800,000	309,700,000
Liabilities measured at fair value:
Other accrued liabilities	0	0	0
Total liabilities measured at fair value	0	0	0
Cash equivalents	495,000,000	495,000,000	0
Restricted investments	68,800,000	68,800,000	35,900,000
Short-term investments	122,400,000	122,400,000	108,200,000
Long-term investments	177,600,000	177,600,000	165,600,000
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	1,497,200,000	1,497,200,000	1,501,300,000
Liabilities measured at fair value:
Other accrued liabilities	(300,000)	(300,000)	(1,300,000)
Total liabilities measured at fair value	(300,000)	(300,000)	(1,300,000)
Cash equivalents	60,200,000	60,200,000	3,400,000
Restricted investments	0	0	0
Short-term investments	464,700,000	464,700,000	418,900,000
Long-term investments	969,500,000	969,500,000	1,078,600,000
Prepaid expenses and other current assets	2,800,000	2,800,000	400,000
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	2,800,000	2,800,000	400,000
Liabilities measured at fair value:
Derivative liabilities	(300,000)	(300,000)	(1,300,000)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Derivative assets:
Total assets measured at fair value	51,400,000	51,400,000	60,200,000
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	51,400,000	51,400,000	60,200,000
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	320,700,000	320,700,000	311,700,000
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	320,700,000	320,700,000	311,700,000
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	19,400,000	19,400,000	9,600,000
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	19,400,000	19,400,000	9,600,000
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	6,700,000	6,700,000	17,700,000
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	6,700,000	6,700,000	17,700,000
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	863,700,000	863,700,000	911,400,000
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	863,700,000	863,700,000	911,400,000
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	35,500,000	35,500,000	16,500,000
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	35,500,000	35,500,000	16,500,000
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	177,200,000	177,200,000	203,700,000
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	177,200,000	177,200,000	203,700,000
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	538,700,000	538,700,000	29,700,000
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	538,700,000	538,700,000	29,700,000
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	5,800,000	5,800,000	6,200,000
Trading securities:
Trading securities	19,300,000	19,300,000	17,700,000
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	5,800,000	5,800,000	6,200,000
Trading securities:
Trading securities	19,300,000	19,300,000	17,700,000
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	4,500,000	4,500,000	8,800,000
Fair Value, Measurements, Recurring [Member] | Publicly-traded equity securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	4,500,000	4,500,000	8,800,000
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	366,700,000	366,700,000	277,600,000
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	295,500,000	295,500,000	247,300,000
Fair Value, Measurements, Recurring [Member] | US government securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	71,200,000	71,200,000	30,300,000
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	2,338,900,000	2,338,900,000	1,792,900,000
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available-for-sale securities:
Available-for-sale securities	844,500,000	844,500,000	292,000,000
Fair Value, Measurements, Recurring [Member] | Available-for-sale securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available-for-sale securities:
Available-for-sale securities	1,494,400,000	1,494,400,000	1,500,900,000
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	51,400,000	51,400,000	60,200,000
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	51,400,000	51,400,000	$ 60,200,000
Fair Value Measurements (Textuals)
Purchases of privately-held investments	$ 0	$ 10,500,000

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable, fair value	$ 132,900,000	$ 132,900,000
Fair Value, Inputs, Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Note receivable, fair value	75,000,000	75,000,000
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	2,246,500,000	2,246,500,000	$ 1,946,700,000
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	$ 0	$ 10,500,000

Derivative Instruments (Details

Derivative Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 136.4	$ 188.6
Cash flow hedges [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	136.4	116.8
Non-designated derivatives [Member]
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency derivatives	$ 0	$ 71.8

Derivative Instruments, Cash Fl

Derivative Instruments, Cash Flow Hedges and Offsetting of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
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	$ 1.5	$ 2.8	$ 4.5	$ (3.3)
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	$ 1.5	$ (3.8)	$ 0.2	$ (6.8)

Derivative Instruments, Non-Des

Derivative Instruments, Non-Designated Hedges (Details) - Foreign exchange contract [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
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	$ (2.4)	$ (1.2)	$ (0.3)

Goodwill and Purchased Intang50

Goodwill and Purchased Intangible Assets, Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2015	$ 2,981.3
Additions due to business combination	20.3
Balance as of June 30, 2016	$ 3,001.6

Goodwill and Purchased Intang51

Goodwill and Purchased Intangible Assets, Purchased Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, net	$ 69.1
Total purchased intangible assets, gross	690.2	$ 646.9
Total purchased intangible assets, accumulated amortization	(568.4)	(560.3)
Total purchased intangible assets, impairments and other charges	(52.7)	(52.7)
Total purchased intangible assets, net	69.1	33.9
Technologies and patents [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	604.8	567.7
Finite-lived intangible assets, accumulated amortization	(498.1)	(491.8)
Finite-lived intangible assets, impairments and other charges	(49.9)	(49.9)
Finite-lived intangible assets, net	56.8	26
Customer contracts, support agreements, and related relationships [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	83.4	78.1
Finite-lived intangible assets, accumulated amortization	(69.2)	(67.8)
Finite-lived intangible assets, impairments and other charges	(2.8)	(2.8)
Finite-lived intangible assets, net	11.4	7.5
Other intangible assets [Member]
Purchased Intangible Assets [Line Items]
Finite-lived intangible assets, gross	2	1.1
Finite-lived intangible assets, accumulated amortization	(1.1)	(0.7)
Finite-lived intangible assets, impairments and other charges	0	0
Finite-lived intangible assets, net	$ 0.9	$ 0.4

Goodwill and Purchased Intang52

Goodwill and Purchased Intangible Assets, Finite Lived Intangible Assets by Class (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 4,800,000	$ 5,600,000	$ 8,100,000	$ 17,600,000
Acceleration of the end of life of certain intangible assets, finite-lived	0		0	5,600,000
Cost of Revenues [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	3,600,000	4,700,000	6,000,000	15,500,000
Sales and Marketing Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	800,000	600,000	1,300,000	1,400,000
General and Administrative Expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	400,000	300,000	800,000	700,000
Operating expense [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,200,000	$ 900,000	$ 2,100,000	$ 2,100,000

Goodwill and Purchased Intang53

Goodwill and Purchased Intangible Assets, Estimated Future Amortization Expense Intangible Assets (Details) $ in Millions	Jun. 30, 2016USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2016	$ 8.1
2,017	12.5
2,018	10.4
2,019	10.2
2,020	10.1
Thereafter	17.8
Finite-lived intangible assets, net	$ 69.1

Other Financial Information, In

Other Financial Information, Inventories, Net (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Financial Information [Abstract]
Production materials	$ 82.4	$ 61.9
Finished goods	28.1	13.1
Inventories	$ 110.5	$ 75

Other Financial Information, Ot

Other Financial Information, Other Long Term Assets (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	18 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Apr. 01, 2017	Dec. 31, 2015	Oct. 01, 2014
Other Financial Information [Line Items]
Privately-held investments	$ 88.5	$ 88.5		$ 102.4
Licensed software	6.2	6.2		7.1
Federal income tax receivable	40.8	40.8		28.9
Inventory	5.6	5.6		8.4
Prepaid costs, deposits, and other	47.2	47.2		43.3
Deferred tax asset	13.2	13.2		55.9
Promissory note in connection with the sale of Junos Pulse	57.9	57.9		132.9
Other long-term assets	259.4	259.4		$ 378.9
Interest income	2.7	5.3
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]
Other Financial Information [Line Items]
Required minimum payment due on notes receivable			$ 75
Prepaid Expenses and Other Current Assets [Member] | Junos Pulse [Member]
Other Financial Information [Line Items]
Promissory note in connection with the sale of Junos Pulse	$ 75	$ 75

Other Financial Information, Wa

Other Financial Information, Warranties (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance as of December 31, 2015	$ 28.4
Provisions made during the period	13.6
Adjustments related to pre-existing warranties	(13.5)
Balance as of June 30, 2016	$ 28.5

Other Financial Information, De

Other Financial Information, Deferred Revenue (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Deferred revenue:
Total deferred revenue	$ 1,295.6	$ 1,168.1
Reported as:
Current	933	822.9
Long-term	362.6	345.2
Total deferred revenue	1,295.6	1,168.1
Sales Revenue, Product, Net [Member]
Deferred revenue:
Undelivered product commitments and other product deferrals	242.5	210.1
Distributor inventory and other sell-through items	99.9	81.8
Deferred gross product revenue	342.4	291.9
Deferred cost of product revenue	(51.6)	(51.6)
Total deferred revenue	290.8	240.3
Reported as:
Total deferred revenue	290.8	240.3
Sales Revenue, Service, Net [Member]
Deferred revenue:
Total deferred revenue	1,004.8	927.8
Reported as:
Total deferred revenue	$ 1,004.8	$ 927.8

Other Financial Information, 58

Other Financial Information, Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Financial Information [Abstract]
Interest income	$ 8.5	$ 6.7	$ 16.4	$ 10.5
Interest expense	(25)	(21.8)	(47.5)	(40.3)
Gain (loss) on investments	3.6	0.2	(1.8)	0.8
Other	1.3	(2.2)	(0.9)	(3.9)
Other expense, net	$ (11.6)	$ (17.1)	$ (33.8)	$ (32.9)

Debt and Financing (Details)

Debt and Financing (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Feb. 29, 2016	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2011
Debt Instrument [Line Items]
Total senior notes	$ 2,150,000,000
Unaccreted discount and debt issuance costs	(17,500,000)
Short-term and Long-term debt, net of discount	$ 2,132,500,000
Redemption percent due to change in control	101.00%
Fixed Rate Note Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000,000	$ 350,000,000
Effective interest rate	3.36%
Long-term debt, stated interest rate	3.125%	3.125%
Fixed rate note due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000,000		$ 300,000,000
Effective interest rate	3.47%
Long-term debt, stated interest rate	3.30%		3.30%
Redemption period	1 month
Fixed rate note due 2020 [Member] | One Month Prior to Maturity [Member]
Debt Instrument [Line Items]
Redemption price	100.00%
Fixed rate note due 2020 [Member] | Three Months Prior to Maturity [Member] | Treasury Rate [Member]
Debt Instrument [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 Instrument [Line Items]
Redemption price	100.00%
Fixed rate note due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000,000				$ 300,000,000
Effective interest rate	4.69%
Long-term debt, stated interest rate	4.60%				4.60%
Fixed Rate Note Due 2024, Issued March 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000,000			$ 350,000,000
Effective interest rate	4.63%
Long-term debt, stated interest rate	4.50%
Fixed Rate Note Due 2024, Issued February 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 150,000,000	$ 150,000,000
Effective interest rate	4.87%
Long-term debt, stated interest rate	4.50%	4.50%
Fixed rate note due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000,000		$ 300,000,000
Effective interest rate	4.47%
Long-term debt, stated interest rate	4.35%		4.35%
Redemption period	3 months
Fixed rate note due 2025 [Member] | One Month Prior to Maturity [Member] | Treasury Rate [Member]
Debt Instrument [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 Instrument [Line Items]
Redemption price	100.00%
Fixed rate note due 2025 [Member] | On or After March 15, 2025 [Member]
Debt Instrument [Line Items]
Redemption price	100.00%
Fixed rate note due 2041 [Member]
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000,000				$ 400,000,000
Effective interest rate	6.03%
Long-term debt, stated interest rate	5.95%				5.95%
Other Fixed Rate Notes [Member]
Debt Instrument [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%

Debt and Financing Customer Fin

Debt and Financing Customer Financing Arrangements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Sale of receivable	$ 9.2	$ 11.8	$ 14.1	$ 58.9
Proceeds from sale and collection of receivables	9.1	$ 25.5	10.8	$ 85.5
Receivables from sale of receivables	$ 4.5		$ 4.5		$ 1.2
Minimum [Member]
Debt Instrument [Line Items]
Number of days due from receivable			30 days
Maximum [Member]
Debt Instrument [Line Items]
Number of days due from receivable			90 days

Equity, Cash Dividends on Share

Equity, Cash Dividends on Shares of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 26, 2016	Mar. 22, 2016	Jan. 27, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders' Equity Note [Abstract]
Cash dividends declared per common stock (in dollars per share)	$ 0.1		$ 0.1	$ 0.1	$ 0.1	$ 0.2	$ 0.2
Common stock dividends paid		$ 38.1				$ 76.4

Equity, Stock Repurchase Activi

Equity, Stock Repurchase Activities (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jul. 31, 2015	Oct. 31, 2014	Feb. 28, 2014
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount							$ 2,100,000,000
Stock repurchased for tax withholding (in shares)	0.1	0.1	0.4	0.2
Stock repurchased for tax withholdings (in dollars per share)	$ 23.31	$ 25.91	$ 24.64	$ 24.80
Value of shares repurchased for tax withholding	$ 1,200,000	$ 2,300,000	$ 9,600,000	$ 4,700,000
2014 Stock Repurchase Program [Member]
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount					$ 3,900,000,000		$ 1,200,000,000
Additional amount authorized under Stock Repurchase Plan					$ 500,000,000	$ 1,300,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 332,100,000		$ 332,100,000
Stock repurchased and retired (in shares)	5.5	23.2	8.6	40.6
Common stock repurchased under stock repurchase program average purchase price (in dollars per share)	$ 23.08	$ 25.83	$ 23.37	$ 24.64
Common stock repurchased and retired under stock repurchase program, value	$ 125,500,000	$ 600,000,000	$ 200,500,000	$ 1,000,000,000

Equity, Components of Accumulat

Equity, Components of Accumulated Other Comprehensive (Loss) Income, Net of Tax (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Other comprehensive gain before reclassifications			$ 15,700,000
Amount reclassified from accumulated other comprehensive income			(900,000)
Other comprehensive gains, net			14,800,000
Other expense, net	$ 11,600,000	$ 17,100,000	33,800,000	$ 32,900,000
Cost of revenues	464,900,000	440,700,000	871,900,000	850,800,000
Sales and marketing	243,700,000	232,400,000	475,500,000	452,600,000
General and administrative	58,600,000	56,300,000	118,000,000	111,500,000
Research and development expense	247,900,000	$ 251,600,000	498,900,000	$ 500,300,000
Unrealized Gains (Losses) on Available-for- Sale Securities [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2015			17,000,000
Other comprehensive gain before reclassifications			6,000,000
Amount reclassified from accumulated other comprehensive income			(800,000)
Other comprehensive gains, net			5,200,000
Balance as of June 30, 2016	22,200,000		22,200,000
Unrealized Gains (Losses) on Available-for- Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Other expense, net			(800,000)
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(1,300,000)
Other comprehensive gain before reclassifications			3,900,000
Amount reclassified from accumulated other comprehensive income			(100,000)
Other comprehensive gains, net			3,800,000
Balance as of June 30, 2016	2,500,000		2,500,000
Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Cost of revenues			100,000
Sales and marketing			(100,000)
Research and development expense			(100,000)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(34,900,000)
Other comprehensive gain before reclassifications			5,800,000
Amount reclassified from accumulated other comprehensive income			0
Other comprehensive gains, net			5,800,000
Balance as of June 30, 2016	(29,100,000)		(29,100,000)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance as of December 31, 2015			(19,200,000)
Balance as of June 30, 2016	$ (4,400,000)		$ (4,400,000)

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	Apr. 01, 2016	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	May 19, 2015
Share-Based Compensation Plans
Common stock, shares, issued		382,800,000	382,800,000	384,000,000
Outstanding stock options, restricted stock units, and restricted stock awards from awards assumed (in shares)		1,200,000	1,200,000
Number of Shares
Balance at beginning of period (in shares)			3,600,000
Exercised (in shares)			(400,000)
Expired (in shares)			(200,000)
Balance at end of period (in shares)		3,000,000	3,000,000
Weighted Average Exercise Price per Share
Balance at beginning of period (in dollars per share)			$ 27.52
Exercised (in dollars per share)			14.10
Expired (in dollars per share)			33.80
Balance at end of period (in dollars per share)		$ 28.98	$ 28.98
Weighted average remaining contractual term at end of period			1 year 9 months 18 days
Aggregate intrinsic value at end of period		$ 7,300,000	$ 7,300,000
Vested or expected-to-vest options at end of period (in shares)		3,000,000	3,000,000
Vested or expected-to-vest options, weighted average exercise price at end of period (in dollars per share)		$ 28.99	$ 28.99
Vested and expected-to-vest options, weighted average remaining contractual term at end of period			1 year 9 months 18 days
Vested or expected-to-vest options, aggregate intrinsic value at end of period		$ 7,200,000	$ 7,200,000
Exercisable options at end of period (in shares)		3,000,000	3,000,000
Exercisable options, weighted average exercise price at end of period (in dollars per share)		$ 29.37	$ 29.37
Exercisable options, weighted average remaining contractual term at end of period			1 year 8 months 12 days
Exercisable options, aggregate intrinsic value at end of period		$ 6,400,000	$ 6,400,000
Share price (in dollars per share)		$ 22.49	$ 22.49
Pre-tax intrinsic value of options exercised		$ 400,000	$ 4,300,000
Market-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Restricted Stock Units (RSUs) and Performance Shares [Member] | BTI Systems, Inc [Member]
Share-Based Compensation Plans
Assumed (in shares)	400,000
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Equity incentive plan 2015 [Member]
Share-Based Compensation Plans
Number of shares in authorized					38,000,000
Number of shares available for future issuance		22,900,000	22,900,000
Equity Incentive Plan 2015, 2006, and 1996 [Member]
Share-Based Compensation Plans
Maximum additional shares expire unexercised, under 1996 and 2000 plan					29,000,000
Equity Incentive Plan 2015 and 2006 [Member]
Share-Based Compensation Plans
Number of shares outstanding		20,400,000	20,400,000
Equity Incentive Plan 1996 [Member]
Share-Based Compensation Plans
Number of shares outstanding		0	0
Equity Incentive Plan 1996 and 2006 [Member]
Share-Based Compensation Plans
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		6,300,000	6,300,000
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		19,700,000	19,700,000
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	Mar. 22, 2016	Jun. 30, 2016	Jun. 30, 2015
Weighted Average Grant-Date Fair Value per Share
Common stock, dividends paid per share (in dollars per share)	$ 0.1
Common stock dividends paid	$ 38.1	$ 76.4
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
Average price of common stock, per share (in dollars per share)		$ 20.06	$ 19.32
RSUs, RSAs, and PSAs [Member]
Number of Shares
Balance at beginning of period (in shares)		18,600,000
Balance at end of period (in shares)		18,600,000
Weighted Average Grant-Date Fair Value per Share
Balance at beginning of period (in dollars per share)		$ 22.71
Balance at end of period (in dollars per share)		$ 23.73
Weighted Average Remaining Contractual Term (In Years)		1 year 4 months 24 days
Aggregate Intrinsic Value		$ 419.3
Restricted Stock Units (RSUs) [Member]
Number of Shares
Granted (in shares)		6,900,000
Assumed (in shares)		200,000
Vested (in shares)		(5,500,000)
Canceled (in shares)		(700,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)		$ 24.68
Assumed (in dollars per share)		24.76
Vested (in dollars per share)		22.37
Canceled (in dollars per share)		$ 23.15
Performance shares (PSAs)
Number of Shares
Granted (in shares)		700,000
Assumed (in shares)		200,000
Vested (in shares)		(600,000)
Canceled (in shares)		(400,000)
Weighted Average Grant-Date Fair Value per Share
Granted (in dollars per share)		$ 23.62
Assumed (in dollars per share)		25.09
Vested (in dollars per share)		21.61
Canceled (in dollars per share)		$ 21.81
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		700,000
Restricted stock awards (RSAs)
Number of Shares
Vested (in shares)		(800,000)
Weighted Average Grant-Date Fair Value per Share
Vested (in dollars per share)		$ 20.76

Employee Benefit Plans, Assumpt

Employee Benefit Plans, Assumptions and Resulting Estimates of Fair Value (Details) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
ESPP [Member]
Estimates of Fair Value
Volatility	35.00%	30.00%
Risk-free interest rate	0.50%	0.10%
Expected life (years)	6 months	6 months
Dividend yield	1.70%	1.90%
Weighted-average fair value per share (in dollars per share)	$ 5.95	$ 5.23
Market-based RSUs [Member]
Estimates of Fair Value
Volatility	36.00%	34.00%
Risk-free interest rate	1.20%	1.40%
Dividend yield	1.70%	1.80%
Weighted-average fair value per share (in dollars per share)	$ 14.71	$ 14.97

Employee Benefit Plans, Share68

Employee Benefit Plans, Share Based Compensation by Cost and Expense Categories (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 55.6	$ 58.9	$ 107.4	$ 104.9
Stock Options [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.1	1.5	2.3	3.7
RSUs, RSAs, and PSAs [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	50.4	53.3	97.2	93.9
ESPP [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	4.1	4.1	7.9	7.3
Cost of Revenues, Product [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	1.5	1.5	3.4	3.2
Cost of Revenues, Service [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	4.3	3.8	7.8	7.2
Research and Development [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	29.5	32.5	61.8	63.2
Sales and Marketing [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	13.8	13.4	23.2	19.2
General and Administrative [Member]
Stock Based Compensation Expense Recorded in Cost and Expense Categories
Share-based compensation expense	$ 6.5	$ 7.7	$ 11.2	$ 12.1

Employee Benefit Plans, Share69

Employee Benefit Plans, Share Based Compensation by Share Based Payment Award Types (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016USD ($)
Stock Options [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost	$ 0.3
Weighted Average Period (In Years)	3 months 18 days
RSUs, RSAs, and PSAs [Member]
Unrecognized Compensation Cost [Abstract]
Unrecognized Compensation Cost	$ 252
Weighted Average Period (In Years)	1 year 10 months 24 days

Segments (Details)

Segments (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)segment	Jun. 30, 2015USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			1
Total net revenues	$ 1,221.3	$ 1,222.2	$ 2,319.2	$ 2,289.6
Routing [Member]
Segment Reporting Information [Line Items]
Total net revenues	574.7	602.4	1,078.8	1,107.2
Switching [Member]
Segment Reporting Information [Line Items]
Total net revenues	209.2	190.2	384.7	356.7
Security [Member]
Segment Reporting Information [Line Items]
Total net revenues	78.2	107.1	151.6	199.9
Total product [Member]
Segment Reporting Information [Line Items]
Total net revenues	862.1	899.7	1,615.1	1,663.8
Total service [Member]
Segment Reporting Information [Line Items]
Total net revenues	$ 359.2	$ 322.5	$ 704.1	$ 625.8

Segments, Geographical (Details

Segments, Geographical (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Net Revenues by Geographic Region [Line Items]
Total net revenues	$ 1,221.3	$ 1,222.2	$ 2,319.2	$ 2,289.6
Property and equipment, net and purchased intangible assets, net	1,135.7		1,135.7		$ 1,054.9
United States [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	661.3	670.6	1,240.3	1,204.1
Property and equipment, net and purchased intangible assets, net	996.2		996.2		925.5
Other [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	58.7	65.2	107.9	120.7
Americas [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	720	735.8	1,348.2	1,324.8
EMEA [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	300.1	316.3	585.5	620.1
Asia Pacific [Member]
Net Revenues by Geographic Region [Line Items]
Total net revenues	201.2	$ 170.1	385.5	$ 344.7
International [Member]
Net Revenues by Geographic Region [Line Items]
Property and equipment, net and purchased intangible assets, net	$ 139.5		$ 139.5		$ 129.4

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2009
Income Tax Contingency [Line Items]
Effective income tax rate	27.20%	30.10%	27.40%	30.40%
Effective income tax rate reconciliation, at federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Equity investments	$ 0.6	$ 0	$ (1.3)	$ 0
Restructuring charges	0	0.2	0	(1.1)
Acquisition-related charges	(3.1)	$ 0	(3.1)	$ 0
Unrecognized tax benefits	215.5		215.5
Unrecognized tax benefits that would impact effective tax rate	185.2		185.2
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Decrease in unrecognized tax benefit due to closure of audit			14.3
Foreign Country [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Interest and penalties recorded					$ 4.6
Maximum [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Greater than remote likelihood decrease in gross unrecognized tax benefits within next 12 months	$ 3.9		$ 3.9

Net Income Per Share (Details)

Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income	$ 140	$ 158	$ 231.4	$ 238.2
Denominator
Weighted-average shares used to compute basic net income per share	382.8	389.9	383	398.4
Dilutive effect of employee stock awards	3.5	7.3	5.6	7.7
Weighted-average shares used to compute diluted net income per share	386.3	397.2	388.6	406.1
Net income per share:
Basic, in dollars per share	$ 0.37	$ 0.41	$ 0.60	$ 0.60
Diluted, in dollars per share	$ 0.36	$ 0.40	$ 0.60	$ 0.59
Net Income per Share Textuals
Potential anti-dilutive shares	8	3.7	2.7	4.8

Commitments and Contingencies (

Commitments and Contingencies (Details) ft² in Thousands	Jul. 10, 2015USD ($)ft²	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Feb. 29, 2016USD ($)	Dec. 31, 2015USD ($)	Mar. 31, 2015USD ($)	Mar. 31, 2011USD ($)
Summarization of principal contractual obligations
Future minimum payments under the non-cancelable operating leases	$ 118,100,000	$ 129,400,000		$ 129,400,000
Rent expense		10,500,000	$ 10,900,000	19,600,000	$ 22,400,000
Lease term, option to extend	20 years
Square feet of leased space | ft²	63
Term of lease	10 years
Tenant allowance	$ 6,000,000
Property and equipment, net		1,066,600,000		1,066,600,000			$ 1,021,000,000
Total purchase commitments		578,000,000		578,000,000
Accrual for estimated carrying charges or obsolete materials charges		19,700,000		19,700,000
Long-term debt, carrying value		2,132,500,000		2,132,500,000			1,637,500,000
Indemnity-related and service-related escrows		85,300,000		85,300,000
Campus build out commitments		3,500,000		3,500,000
Other contractual obligations		42,100,000		42,100,000
Long-term income taxes payable		199,800,000		199,800,000			187,300,000
Construction in Progress [Member]
Summarization of principal contractual obligations
Property and equipment, net							$ 45,600,000
Addition to build-to-suit asset				15,300,000
Assets Held under Capital Leases [Member]
Summarization of principal contractual obligations
Property and equipment, net		60,900,000		60,900,000
Fixed Rate Note Due 2019 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 350,000,000		$ 350,000,000		$ 350,000,000
Short-term and Long-term debt, stated interest rate		3.125%		3.125%		3.125%
Fixed rate note due 2020 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300,000,000		$ 300,000,000				$ 300,000,000
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		$ 300,000,000		$ 300,000,000					$ 300,000,000
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		$ 500,000,000		$ 500,000,000
Short-term and Long-term debt, stated interest rate		4.50%		4.50%
Fixed rate note due 2025 [Member]
Summarization of principal contractual obligations
Long-term debt, gross		$ 300,000,000		$ 300,000,000				$ 300,000,000
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		$ 400,000,000		$ 400,000,000					$ 400,000,000
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	Jun. 30, 2016	Dec. 31, 2015
Financing guarantees, bank guarantees, and standby letters of credit [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value	$ 6.4	$ 15.8
Other Current Liabilities [Member] | Indemnification Agreement [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, current carrying value	$ 16.8

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	Jul. 26, 2016	Apr. 26, 2016	Jan. 27, 2016	Aug. 04, 2016	Jul. 31, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Subsequent Event [Line Items]
Cash dividends declared per common stock (in dollars per share)		$ 0.1	$ 0.1			$ 0.1	$ 0.1	$ 0.2	$ 0.2
2014 Stock Repurchase Program [Member]
Subsequent Event [Line Items]
Common stock repurchased under stock repurchase program average purchase price (in dollars per share)						$ 23.08	$ 25.83	$ 23.37	$ 24.64
Stock repurchased and retired (in shares)						5.5	23.2	8.6	40.6
Stock repurchase program, remaining authorized repurchase amount						$ 332.1		$ 332.1
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividends declared per common stock (in dollars per share)	$ 0.1
Subsequent Event [Member] | 2014 Stock Repurchase Program [Member]
Subsequent Event [Line Items]
Shares repurchased, in shares				0.9
Shares repurchased, value				$ 20
Common stock repurchased under stock repurchase program average purchase price (in dollars per share)				$ 22.42
Stock repurchase program, remaining authorized repurchase amount				$ 312.1
Aurrion, Inc | Subsequent Event [Member]
Subsequent Event [Line Items]
Consideration for business acquisition					$ 165