CDW (CDW) 10-Q 3 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information Document - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	CDW Corp
Entity Central Index Key	1,402,057
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		160,506,730

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and cash equivalents	$ 118.3	$ 37.6
Accounts receivable, net of allowance for doubtful accounts	2,019.8	2,017.4
Merchandise inventory	451.6	393.1
Miscellaneous receivables	269.4	198.4
Prepaid expenses and other	138.7	144.3
Total current assets	2,997.8	2,790.8
Property and equipment, net	162.5	175.4
Goodwill	2,467.9	2,500.4
Other intangible assets, net	1,110.6	1,276.4
Other assets	34	12.3
Total assets	6,772.8	6,755.3
Current liabilities:
Accounts payable-trade	997.7	866.5
Accounts payable-inventory financing	477.7	439.6
Current maturities of long-term debt	18.5	27.2
Deferred revenue	180.1	151.9
Accrued expenses:
Compensation	164.8	120.4
Interest	17.5	25.1
Sales taxes	30.2	38.1
Advertising	68.6	52.3
Income taxes	12.7	0
Other	159	166.2
Total current liabilities	2,126.8	1,887.3
Long-term liabilities:
Long-term Debt, Excluding Current Maturities	3,222.9	3,232.5
Deferred income taxes	393.2	469.6
Other liabilities	39.4	70
Total long-term liabilities	3,655.5	3,772.1
Commitments and contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock	1.6	1.7
Paid-in capital	2,843.6	2,806.9
Accumulated deficit	(1,738.9)	(1,651.6)
Accumulated other comprehensive loss	(115.8)	(61.1)
Total stockholders' equity	990.5	1,095.9
Total liabilities and stockholders' equity	$ 6,772.8	$ 6,755.3

Consolidated Balance Sheets Par

Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 5.9	$ 6
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	100	100
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	160.5	168.2
Common stock, shares outstanding	160.5	168.2

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net Sales	$ 3,708.2	$ 3,501.1	$ 10,489.5	$ 9,570.3
Cost of sales	3,093.9	2,933.9	8,740.2	8,012.1
Gross profit	614.3	567.2	1,749.3	1,558.2
Selling and administrative expenses	334.9	321.4	1,009	887.5
Advertising expense	41.9	41.2	118.3	108.6
Income from operations	237.5	204.6	622	562.1
Interest Income (Expense), Net	(37.6)	(38.5)	(112.6)	(121.1)
Net loss on extinguishments of long-term debt	(2.1)	0	(2.1)	(24.3)
Gain on remeasurement of equity investment	0	98.1	0	98.1
Other income (loss), net	0.4	(18)	2.3	(9.5)
Income (loss) before income taxes	198.2	246.2	509.6	505.3
Income tax (expense) benefit	(72.3)	(95.3)	(188.4)	(191.5)
Net income (loss)	$ 125.9	$ 150.9	$ 321.2	$ 313.8
Income Per Share - Basic	$ 0.78	$ 0.89	$ 1.95	$ 1.84
Income Per Share - Diluted	$ 0.76	$ 0.88	$ 1.93	$ 1.82
Weighted Average Shares - Basic	162.1	169.6	164.8	170.9
Weighted Average Shares - Diluted	164.9	171	166.9	172.3
Common Stock, Dividends, Per Share, Cash Paid	$ 0.1075	$ 0.0675	$ 0.3225	$ 0.2025

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 125.9	$ 150.9	$ 321.2	$ 313.8
Foreign currency translation adjustment	(11.9)	(22.4)	(54.7)	(28.7)
Other Comprehensive Income (Loss), Net of Tax	(11.9)	(22.4)	(54.7)	(28.7)
Comprehensive income (loss)	$ 114	$ 128.5	$ 266.5	$ 285.1

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Loss) Parenthetical (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	$ (0.1)	$ 0.2	$ 0.3	$ 0.5

Consolidated Statement Of Share

Consolidated Statement Of Shareholders' Equity (Deficit) - 9 months ended Sep. 30, 2016 - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Preferred stock, issued, beginning balance at Dec. 31, 2015	0	0
Common stock, shares issued, beginning balance at Dec. 31, 2015	168.2		168.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0.3
Stock Issued During Period, Shares, New Issues			0.2
Stock Issued During Period, Shares, Employee Stock Purchase Plans			0.2
Stock Repurchased During Period, Shares			(8.4)
Preferred stock, issued, ending balance at Sep. 30, 2016	0	0
Common stock, shares issued, ending balance at Sep. 30, 2016	160.5		160.5
Balance at Dec. 31, 2015	$ 1,095.9	$ 0	$ 1.7	$ 2,806.9	$ (1,651.6)	$ (61.1)
Shareholders' Equity (Deficit) [Roll Forward]
Equity-based compensation expense	23.4	0	0	23.4	0	0
Stock Option Exercises	6	0	0	6	0	0
Stock Issued During Period, Value, New Issues	0	0	0	0	0	0
Stock Issued During Period, Value, Employee Stock Purchase Plan	6.9	0	0	6.9	0	0
Dividends	(53.1)	0	0	0.4	(53.5)	0
Net income (loss)	321.2	0	0	0	321.2	0
Stock Repurchased and Retired During Period, Value	(355.1)	0	(0.1)	0	(355)	0
Foreign currency translation adjustment	(54.7)	0	0	0	0	(54.7)
Balance at Sep. 30, 2016	$ 990.5	$ 0	$ 1.6	$ 2,843.6	$ (1,738.9)	$ (115.8)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income (loss)	$ 321.2	$ 313.8
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	190.7	165
Equity based compensation expense	28.1	20
Increase (Decrease) in Deferred Income Taxes	(74.8)	(32)
Amortization of deferred financing costs, debt premium and debt discount, net	4.4	4.7
Net loss on extinguishments of long-term debt	2.1	24.3
Income from equity method investment	0	11.2
Gain on remeasurement of equity investment	0	(98.1)
Other Operating Activities, Cash Flow Statement	0.5	3.1
Changes in assets and liabilities:
Accounts receivable	(17.9)	(178.4)
Merchandise inventory	(64.6)	(54.8)
Other assets	(101.2)	(101.7)
Accounts payable trade	141.5	226
Other current liabilities	97.4	(17.1)
Long-term liabilities	(28.1)	8.9
Net cash provided by operating activities	499.3	294.9
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	(41.4)	(43.9)
Payments for Derivative Instrument, Investing Activities	(2.1)	(0.5)
Payments to Acquire Businesses, Net of Cash Acquired	0	(263.8)
Net cash used in investing activities	(43.5)	(308.2)
Cash flows from financing activities:
Proceeds from Lines of Credit	332.1	105
Repayments of Lines of Credit	(332.1)	(105)
Repayments of long-term debt	(17)	(26.1)
Proceeds from Issuance of Long-term Debt	1,483	525
Payments to extinguish long-term debt	(1,490.4)	(525.3)
Proceeds from (Repayments of) Other Long-term Debt	15.7	0
Payments of Financing Costs	(5.9)	(6.8)
Net change in accounts payable-inventory financing	39.2	22.6
Proceeds from stock option exercises	6	1.7
Proceeds from Coworker Stock Purchase Plan	6.9	6.5
Payments for Repurchase of Common Stock	(355)	(193.3)
Dividends paid	(53.1)	(34.6)
Proceeds from (Payments for) Other Financing Activities	(0.3)	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	0.4
Net cash used in financing activities	(370.9)	(229.9)
Effect of exchange rate changes on cash and cash equivalents	(4.2)	(3.8)
Net increase (decrease) in cash and cash equivalents	80.7	(247)
Cash and cash equivalents - beginning of period	37.6	344.5
Cash and cash equivalents - end of period	118.3	97.5
Supplementary disclosure of cash flow information:
Interest paid	(117.4)	(125.4)
Taxes paid, net	(234.5)	(218)
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net income (loss)	424.8	395
Adjustments to reconcile net income to net cash provided by operating activities:
Net loss on extinguishments of long-term debt	0	0
Gain on remeasurement of equity investment		0
Changes in assets and liabilities:
Net cash provided by operating activities	495.7	331.7
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	(3.2)	(7.4)
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	(3.2)	(7.4)
Cash flows from financing activities:
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Payments to extinguish long-term debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	15.7
Payments of Financing Costs	0	0
Net change in accounts payable-inventory financing	41	22.6
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Payments for Repurchase of Common Stock	0	0
Dividends paid	0	0
Proceeds from (Payments for) Other Financing Activities	0.8
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Net cash used in financing activities	(492.5)	(324.3)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0

Description Of Business And Sum

Description Of Business And Summary Of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
Description of Business and Summary of Significant Accounting Policies [Abstract]
Description Of Business And Summary Of Significant Accounting Policies	Description of Business and Summary of Significant Accounting Policies Description of Business CDW Corporation (“Parent”) is a Fortune 500 company with multi-national capabilities and a leading provider of integrated information technology (“IT”) solutions to small, medium and large business, government, education and healthcare customers in the United States, Canada and the United Kingdom. The Company's offerings range from discrete hardware and software products to integrated IT solutions such as mobility, security, data center optimization, cloud computing, virtualization and collaboration. Throughout this report, the terms the “Company” and “CDW” refer to Parent and its 100% owned subsidiaries. Parent has two 100% owned subsidiaries, CDW LLC and CDW Finance Corporation. CDW LLC is an Illinois limited liability company that, together with its 100% owned subsidiaries, holds all material assets and conducts all business activities and operations of the Company. CDW Finance Corporation is a Delaware corporation formed for the sole purpose of acting as co-issuer of certain debt obligations and does not hold any material assets or engage in any business activities or operations. On August 1, 2015, the Company completed the acquisition of Kelway TopCo Limited (“Kelway”) by purchasing the remaining 65% of its outstanding common stock, which increased the Company’s ownership interest from 35% to 100% , and provided the Company control. On April 4, 2016, Kelway was rebranded CDW UK. Throughout this report, the term "CDW UK" refers to Kelway. For further details regarding the acquisition, see Note 3 (Acquisition). Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 (the “Consolidated Financial Statements”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for interim financial statements. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 (the “December 31, 2015 Consolidated Financial Statements”). The significant accounting policies used in preparing these Consolidated Financial Statements were applied on a basis consistent with those reflected in the December 31, 2015 Consolidated Financial Statements. In the opinion of management, the Consolidated Financial Statements contain all adjustments (consisting of a normal, recurring nature) necessary to present fairly the Company's financial position, results of operations, comprehensive income, cash flows and changes in stockholders' equity as of the dates and for the periods indicated. The unaudited results of operations for such interim periods reported are not necessarily indicative of results for the full year. Principles of Consolidation The accompanying Consolidated Financial Statements include the accounts of Parent and its 100% owned subsidiaries. All intercompany transactions and accounts are eliminated in consolidation. Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make use of certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the Consolidated Financial Statements and the reported amounts of revenue and expenses during the reported periods. The Company bases its estimates on historical experience and on various other assumptions that management believes are reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ from those estimates. The notes to the Consolidated Financial Statements contained in the December 31, 2015 Consolidated Financial Statements include an additional discussion of the significant accounting policies and estimates used in the preparation of the Company's Consolidated Financial Statements. There have been no material changes to the Company's significant accounting policies and estimates during the nine months ended September 30, 2016 .

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2016
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Classification of Certain Cash Receipts and Cash Payments In August 2016, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2016-15, Classification of Certain Cash Receipts and Cash Payments (Topic 230), providing guidance for eight specific cash flow issues with the objective of reducing the existing diversity in practice. This ASU 2016-15 is effective for the Company beginning in the first quarter of 2018 and allows for early adoption. The Company is currently evaluating the impact the ASU will have on its Consolidated Financial Statements. Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This ASU introduces a new forward-looking approach, based on expected losses, to estimate credit losses on certain types of financial instruments, including trade receivables. The estimate of expected credit losses will require considerations of historical information, current information and reasonable and supportable forecasts. This ASU also expands the disclosure requirements to enable users of financial statements to understand the assumptions, models and methods for estimating expected credit losses. This ASU is effective for the Company beginning in the first quarter of 2020 and allows for early adoption beginning in the first quarter of 2019. The Company is currently evaluating the impact the ASU will have on its Consolidated Financial Statements. Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, requiring the recognition of the excess tax benefits of stock awards in the provision for income taxes in the income statement when the awards are settled and allowing the Company to repurchase more of an employee's shares for tax withholding purposes than allowed under current guidance, without triggering liability accounting. This ASU also addresses simplifications related to statement of cash flows classification and accounting for forfeitures. This ASU is effective for the Company beginning in the first quarter of 2017 and allows for early adoption. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, requiring the Company to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. As a result of the adoption of this ASU, the Company recorded a $1.2 million tax benefit in its Consolidated Financial Statements. Accounting for Leases In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), requiring lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. This ASU is effective for the Company beginning in the first quarter of 2019 and allows for early adoption. Although the Company is currently evaluating the provisions of the ASU to determine how it will be affected, the primary impact of the new ASU will be to record assets and liabilities for current operating leases. Balance Sheet Classification of Deferred Taxes In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, simplifying the presentation of deferred income taxes by requiring all deferred taxes to be presented as noncurrent in the balance sheet. In the first quarter of 2016, the Company elected to early adopt ASU 2015-17 on a prospective basis. The adoption of this ASU did not have a material impact on the Company's Consolidated Financial Statements. Simplifying the Measurement of Inventory In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, amending the subsequent measurement of inventory by requiring inventory to be measured at the lower of cost and net realizable value instead of the lower of cost or market value. This ASU is effective for the Company beginning in the first quarter of 2017, allows for early adoption and must be applied prospectively after the date of adoption. The adoption of this ASU is not expected to have a material impact on the Company’s Consolidated Financial Statements. Revenue Recognition In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), replacing most existing revenue recognition guidance under GAAP and eliminating industry specific guidance. The core principle of the new guidance is that an entity should recognize revenue for the transfer of goods and services equal to an amount it expects to be entitled to receive for those goods and services. In August 2015, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date, deferring the effective date by one year. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Gross versus Net), clarifying the principal versus agent guidance in the new revenue recognition standard, by revising the indicators to focus on evidence that the company is a principal. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, reducing the complexity when applying the guidance for identifying performance obligations and clarifying how to determine whether revenue related to a performance obligation for an intellectual property license is recognized over time or at a point in time. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, clarifying certain core recognition principles including collectability, sales tax presentation, noncash consideration, contract modifications and completed contracts at transition. These ASUs are effective for the Company beginning in the first quarter of 2018, allow for early adoption in the first quarter of 2017 and may be applied using either a full retrospective approach or a modified retrospective approach. The Company is currently evaluating the method of adoption and the impact these ASUs will have on its Consolidated Financial Statements.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Acquisition	Acquisition On August 1, 2015 , the Company completed the acquisition of CDW UK by purchasing the remaining 65% of its outstanding common stock, which increased the Company's ownership interest from 35% to 100% , and provided the Company control. A summary of the total consideration transferred is as follows: (in millions) Acquisition-Date Fair Value Cash $ 291.6 Fair value of CDW common stock (1) 33.2 Fair value of previously held equity investment on the date of acquisition (2) 174.9 Total consideration $ 499.7 (1) The Company issued 2 million shares of CDW common stock. The fair value of the common stock was based on the closing market price on July 31, 2015 , adjusted for the lack of marketability as the shares of CDW common stock issued to the sellers are subject to a three -year lock up restriction from August 1, 2015 . One of the sellers granted 1 million stock options to certain CDW UK coworkers over his shares of CDW common stock received in the transaction. The fair value of these stock options was $22 million , which has been accounted for as post-combination stock-based compensation and is being amortized over the weighted­-average requisite service period of 3.2 years. Compensation expense for these options is included in Selling and administrative expenses in the Consolidated Statements of Operations. (2) As a result of the Company obtaining control over CDW UK, the Company’s previously held 35% equity investment was remeasured to fair value, resulting in a gain of $98 million included in Gain on remeasurement of equity investment in the Consolidated Statements of Operations. The fair value of the previously held equity investment was determined by management with the assistance of a third party valuation firm, based on information available as of the acquisition date. The recognized amounts of identifiable assets acquired and liabilities assumed, translated using the foreign currency exchange rates on the date of acquisition, are as follows: (in millions) Acquisition-Date Fair Value (1) Cash $ 27.8 Accounts receivable 135.7 Merchandise inventory 27.1 Property and equipment, net 11.4 Identified intangible assets (2) 289.8 Other assets 53.5 Total assets acquired 545.3 Accounts payable—trade (86.1 ) Deferred revenue (57.2 ) Other liabilities (41.7 ) Deferred tax liabilities (55.1 ) Debt (111.5 ) Total liabilities assumed (351.6 ) Total identifiable net assets 193.7 Goodwill 306.0 Total purchase price $ 499.7 (1) The fair values assigned to the tangible and intangible assets acquired and liabilities assumed were based on management’s estimates and assumptions, as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques. (2) Details of the identified intangible assets are as follows: (in millions) Acquisition-Date Fair Value Weighted-Average Amortization Period (in years) Customer relationships $ 260.8 13 Customer contracts 25.9 3 Developed technology 1.7 2 Trade name 1.4 1 Total identified intangible assets $ 289.8 Goodwill in the amount of $306 million was recognized in the acquisition of CDW UK and is attributable to the business from new customers and the value of the acquired assembled workforce. The goodwill was allocated to the CDW UK operating segment which is included with CDW Canada in an all other category (“Other”). The full amount of goodwill recognized is not deductible for income tax purposes in the United Kingdom. The unaudited pro forma Consolidated Statements of Operations in the table below summarizes the combined results of operations of the Company and CDW UK, using historical foreign currency exchange rates, as if the acquisition had been completed on January 1, 2015, and gives effect to pro forma events that are factually supportable and directly attributable to the transaction. The unaudited pro forma results reflect adjustments for equity-based compensation, acquisition and integration costs, incremental intangible asset amortization based on the fair values of each identifiable intangible asset, which are subject to change within the measurement period, pre-acquisition equity earnings, the gain on the remeasurement of the Company’s previously held 35% equity method investment, elimination of pre-acquisition intercompany sales transactions and the impacts of certain other pre-acquisition transactions. Pro forma adjustments were tax-effected at the statutory rates within the applicable jurisdictions. This unaudited pro forma information is presented for informational purposes only and may not be indicative of the historical results of operations that would have been obtained if the acquisition had taken place on January 1, 2015, nor the results that may be obtained in the future. This unaudited pro forma information does not reflect future synergies, integration costs, or other such costs or savings. The unaudited pro forma Consolidated Statements of Operations for the three and nine months ended September 30, 2015 is as follows: (in millions) Three months ended Nine months ended Net sales $ 3,585.5 $ 10,099.2 Net income 101.8 273.5 The unaudited pro forma information above reflects the following adjustments: (1) Excludes acquisition and integration costs directly related to the transaction. (2) Includes additional amortization expense related to the fair value of acquired intangibles. (3) Excludes the Company's share of net income/loss from its previously held 35% equity investment prior to the completion of the acquisition. (4) Includes additional non-cash equity-based compensation related to equity awards granted to CDW UK coworkers after the completion of the acquisition.

Inventory Financing Agreements

Inventory Financing Agreements	9 Months Ended
	Sep. 30, 2016
Inventory Financing Agreements [Abstract]
Inventory Financing Agreements	Inventory Financing Agreements The Company has entered into agreements with certain financial intermediaries to facilitate the purchase of inventory from various suppliers under certain terms and conditions. These amounts are classified separately as Accounts payable-inventory financing on the Consolidated Balance Sheets. The Company does not incur any interest expense associated with these agreements as balances are paid when they are due. Amounts included in Accounts payable-inventory financing are as follows: (in millions) September 30, 2016 December 31, 2015 Revolving Loan inventory financing agreement (1) $ 468.2 $ 427.0 Other inventory financing agreements (2) 9.5 12.6 Accounts payable-inventory financing $ 477.7 $ 439.6 (1) The Senior Secured Asset-Based Revolving Credit Facility (“Revolving Loan”) includes an inventory floorplan sub-facility that enables the Company to maintain an inventory financing agreement with a financial intermediary to facilitate the purchase of inventory from certain vendors on more favorable terms than offered directly by the vendors. (2) As of September 30, 2016 and December 31, 2015 , amounts owed under other inventory financing agreements of $1 million or less, for both periods, were collateralized by the inventory purchased under these financing agreements and a second lien on the related accounts receivable.

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2016
Long-term Debt, Unclassified [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt as of September 30, 2016 is as follows: (dollars in millions) Interest Rate Principal Unamortized Discount and Deferred Financing Costs Total Senior secured asset-based revolving credit facility (1) — % $ — $ — $ — CDW UK revolving credit facility (2) — % — — — Senior secured term loan facility 3.00 % 1,486.7 (15.5 ) 1,471.2 CDW UK term loan 1.79 % 72.6 (0.6 ) 72.0 Senior notes due 2022 6.0 % 600.0 (5.9 ) 594.1 Senior notes due 2023 5.0 % 525.0 (5.5 ) 519.5 Senior notes due 2024 5.5 % 575.0 (6.1 ) 568.9 Other long-term obligations 15.7 — 15.7 Total debt 3,275.0 (33.6 ) 3,241.4 Less current maturities (18.5 ) — (18.5 ) Long-term debt, excluding current maturities $ 3,256.5 $ (33.6 ) $ 3,222.9 Long-term debt as of December 31, 2015 is as follows: (dollars in millions) Interest Principal Unamortized Discount and Deferred Financing Costs Total Senior secured asset-based revolving credit facility (1) — % $ — $ — $ — CDW UK revolving credit facility (2) — % — — — Senior secured term loan facility 3.25 % 1,498.1 (6.7 ) 1,491.4 CDW UK Term Loan 1.98 % 88.4 (0.6 ) 87.8 Senior notes due 2022 6.0 % 600.0 (6.6 ) 593.4 Senior notes due 2023 5.0 % 525.0 (6.2 ) 518.8 Senior notes due 2024 5.5 % 575.0 (6.7 ) 568.3 Total debt 3,286.5 (26.8 ) 3,259.7 Less current maturities (27.2 ) — (27.2 ) Long-term debt, excluding current maturities $ 3,259.3 $ (26.8 ) $ 3,232.5 (1) The Senior Secured Asset-Based Revolving Credit Facility includes an inventory floorplan sub-facility that enables the Company to maintain an inventory financing agreement with a financial intermediary to facilitate the purchase of inventory from certain vendors on more favorable terms than offered directly by the vendors. As of September 30, 2016 , the Company had no outstanding borrowings under the Revolving Loan, $1 million of undrawn letters of credit and $446 million reserved related to the floorplan sub-facility. As of September 30, 2016 , the borrowing base was $1,584 million based on the amount of eligible inventory and accounts receivable balances as of August 31, 2016. The Company could have borrowed up to an additional $802 million under the Revolving Loan as of September 30, 2016 . (2) The CDW UK Revolving Credit Facility is a multi-currency revolving credit facility expiring on August 1, 2021, under which CDW UK is permitted to borrow an aggregate amount of £ 50 million ( $65 million as of September 30, 2016 ). Debt Covenants As of September 30, 2016 , the Company remained in compliance with the covenants under its various credit agreements, the most restrictive of which is under the credit agreement governing the Senior Secured Term Loan Facility ("Term Loan"). Under the Term Loan, there are restrictions on the ability of CDW to pay dividends, make share repurchases, redeem subordinated debt and engage in certain other transactions. As of September 30, 2016 , the amount of CDW’s restricted payment capacity under the Term Loan was $680 million . However, the Company is separately permitted to make restricted payments, so long as the total net leverage ratio is less than 3.25 on a pro forma basis. The total net leverage ratio was 2.9 as of September 30, 2016 . The CDW UK Term Loan Agreement imposes restrictions on CDW UK's ability to transfer funds to the Company through the payment of dividends, intercompany loans, advances or the repayment of subordinated debt that require, among other things, the maintenance of a minimum net leverage ratio. As of September 30, 2016 , the amount of CDW UK's restricted payment capacity under the CDW UK Term Loan was $120 million . Senior Secured Term Loan Facility (“Term Loan”) On August 17, 2016, the Company entered into a new seven-year $ 1,490 million aggregate principal amount senior secured term loan facility ("Term Loan"). The Term Loan was issued at a price that was 99.5% of par, which resulted in a discount of $7 million . Fees of $5 million were capitalized as deferred financing costs and are being amortized over the seven-year term on a straight-line basis. The Term Loan replaced the prior senior secured term loan facility (the “Prior Term Loan Facility”) that had an outstanding aggregate principal amount of $1,490 million . In connection with this refinancing, the Company recorded a loss on extinguishment of long-term debt of $2 million in the Consolidated Statement of Operations for the three months ended September 30, 2016. This loss represented the write-off of a portion of the unamortized deferred financing costs and unamortized discount related to the Prior Term Loan Facility. The Company is required to pay quarterly principal installments equal to 0.25% of the original principal amount of the Term Loan, with the remaining principal amount payable on the maturity date of August 17, 2023. The quarterly principal installment payments of $4 million commenced during the quarter ended September 30, 2016. At September 30, 2016, the outstanding principal amount of the Term Loan was $1,487 million , excluding $16 million of unamortized discount and deferred financing costs. Borrowings under the Term Loan bear interest at either (a) the alternate base rate (“ABR”) plus a margin or (b) LIBOR plus a margin; provided that for the purposes of the Term Loan, LIBOR shall not be less than 0.75% per annum at any time (“LIBOR Floor”), payable quarterly on the last day of each March, June, September and December. The margin is based upon a net leverage ratio as defined in the agreement governing the Term Loan which is 1.25% for ABR borrowings and 2.25% for LIBOR borrowings. As of September 30, 2016, an interest rate of 3.0% was in effect, which represents the LIBOR Floor plus a 2.25% margin. CDW UK Term Loan On August 1, 2016, the Company entered into a new five-year £ 56 million ( $72 million as of September 30, 2016) aggregate principal amount term loan facility ("CDW UK Term Loan"). The CDW UK Term Loan replaced the prior senior secured term loan facility (the “Prior CDW UK Term Loan Facility”) that had an outstanding aggregate principal amount of £ 56 million . The Company is required to pay annual principal installments of £ 5 million , with the remaining principal amount payable on the maturity date of August 1, 2021. The annual principal installment payments will commence during the quarter ended September 30, 2018. At September 30, 2016, the outstanding principal amount of the CDW UK Term Loan was £ 56 million , excluding £ 0.5 million ( $0.6 million as of September 30, 2016) of unamortized deferred financing costs. Borrowings under the CDW UK Term Loan bear interest at LIBOR plus a margin, payable quarterly on the last day of each March, June, September and December. As of September 30, 2016, an interest rate of 1.79% was in effect, which represents LIBOR plus a 0.39% margin. In connection with this refinancing, the Prior CDW UK Term Loan Facility was amended to include both the CDW UK Term Loan and a £ 50.0 million revolving credit facility ("CDW UK Revolving Credit Facility"). The CDW UK Revolving Credit Facility replaced the prior £ 50 million revolving credit facility and expires on August 1, 2021. As of September 30, 2016, there were no outstanding borrowings under the CDW UK Revolving Credit Facility. Fair Value The fair values of the 2022, 2023 and 2024 Senior Notes were estimated using quoted market prices for identical liabilities that are traded in over-the-counter secondary markets that are not considered active. The fair value of the Term Loan was estimated using dealer quotes for identical liabilities in markets that are not considered active. Consequently, the Company's long-term debt is classified as Level 2 within the fair value hierarchy. The fair value of the CDW UK Term Loan was estimated using a discounted cash flow analysis based on current incremental borrowing rates for similar arrangements. The approximate fair values and related carrying values of the Company's long-term debt, including current maturities and excluding unamortized discount and unamortized deferred financing costs, were as follows: (in millions) September 30, 2016 December 31, Fair value $ 3,376.2 $ 3,330.4 Carrying value 3,275.0 3,286.5 Interest Rate Cap Agreements In order to manage the risk associated with changes in interest rates on borrowings under the Term Loan, the Company maintains interest rate cap agreements. As of September 30, 2016 the interest rate cap agreements had a combined notional amount of $1,400 million and are effective from January 14, 2015 through January 14, 2017. Under these agreements, the Company has the right to receive payments equal to the amount, if any, by which the three-month LIBOR exceeds 2.0% during the agreement period. The fair value of the Company's interest rate cap agreements was less than $1 million as of September 30, 2016 and December 31, 2015 . In connection with the upcoming expiration of the interest rate cap agreements noted above in the first quarter of 2017, during the quarter ended September 30, 2016, the Company entered into eleven additional interest rate cap agreements for a combined notional amount of $1,200 million . Under these agreements, the Company made premium payments totaling $2 million to the counterparties in exchange for the right to receive payments equal to the amount, if any, by which three-month LIBOR exceeds 1.5% during the agreement period. These interest rate cap agreements are effective from January 14, 2017 through December 31, 2018. The fair value of these interest rate cap agreements was $2 million at September 30, 2016. The Company’s interest rate cap agreements have not been designated as cash flow hedges for interest rate risk for GAAP accounting purposes. The interest rate cap agreements are recorded at fair value on the Company’s consolidated balance sheet in Other Assets each period, with changes in fair value recorded directly to interest expense in the Company’s Consolidated Statements of Operations. The fair value of the Company’s interest rate cap agreements is classified as Level 2 in the fair value hierarchy. The valuation of the interest rate cap agreements is derived by using a discounted cash flow analysis on the expected cash receipts that would occur if variable interest rates rise above the strike rates of the caps. This analysis reflects the contractual terms of the interest rate cap agreements, including the period to maturity, and uses observable market-based inputs, including LIBOR curves and implied volatilities. The Company also incorporates insignificant credit valuation adjustments to appropriately reflect the respective counterparty’s nonperformance risk in the fair value measurements. The counterparty credit spreads are based on publicly available credit information obtained from a third party credit data provider.

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings per Share The numerator for both basic and diluted earnings per share is Net income. The denominator for basic earnings per share is the weighted-average shares outstanding during the period. A reconciliation of basic weighted-average shares outstanding to diluted weighted-average shares outstanding is as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2016 2015 2016 2015 Basic weighted-average shares outstanding 162.1 169.6 164.8 170.9 Effect of dilutive securities (1) 2.8 1.4 2.1 1.4 Diluted weighted-average shares outstanding (2) 164.9 171.0 166.9 172.3 (1) The dilutive effect of outstanding stock options, restricted stock units, restricted stock, performance share units and Coworker Stock Purchase Plan units is reflected in the diluted weighted-average shares outstanding using the treasury stock method. (2) There were less than 1 million potential common shares excluded from diluted weighted-average shares outstanding for the three and nine months ended September 30, 2016 and 2015, respectively, as their inclusion would have had an anti-dilutive effect.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2016
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is party to various legal proceedings that arise in the ordinary course of its business, which include commercial, intellectual property, employment, tort and other litigation matters. The Company is also subject to audit by federal, state, international, national, provincial and local authorities, and by various partners, group purchasing organizations and customers, including government agencies, relating to purchases and sales under various contracts. In addition, the Company is subject to indemnification claims under various contracts. From time to time, certain customers of the Company file voluntary petitions for reorganization or liquidation under the US bankruptcy laws or similar laws of the jurisdictions for the Company’s business activities outside of the US. In such cases, certain pre-petition payments received by the Company could be considered preference items and subject to return to the bankruptcy administrator. On October 29, 2015, the Company learned of an investigation by the SEC of the Company’s vendor partner program incentives. The SEC’s investigation is ongoing, and the Company is continuing to cooperate with the SEC in this matter. As of September 30, 2016 , the Company does not believe that there is a reasonable possibility that any material loss exceeding the amounts already recognized for these proceedings and matters, if any, has been incurred. However, the ultimate resolutions of these proceedings and matters are inherently unpredictable. As such, the Company's financial condition and results of operations could be adversely affected in any particular period by the unfavorable resolution of one or more of these proceedings or matters.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information The Company has two reportable segments: Corporate, which is comprised primarily of private sector business customers in the US, and Public, which is comprised of government agencies and education and healthcare institutions in the US. The Company has two other operating segments: CDW Canada and CDW UK, both of which do not meet the reportable segment quantitative thresholds and, accordingly, are included in an all other category (“Other”). Effective January 1, 2016, CDW Advanced Services is no longer an operating segment. Its results have been allocated to the Corporate and Public segments to align the Company's financial reporting with the manner in which the Chief Operating Decision Maker assesses performance and makes resource allocation decisions. Segment information reported in prior periods has been reclassified to conform to the current period presentation. Information about the Company’s segments for the three and nine months ended September 30, 2016 and 2015 is as follows: (in millions) Corporate Public Other Headquarters Total Three Months Ended September 30, 2016: Net sales $ 1,748.9 $ 1,640.6 $ 318.7 $ — $ 3,708.2 Income (loss) from operations (1) 138.0 120.0 10.0 (30.5 ) 237.5 Depreciation and amortization expense (25.8 ) (11.2 ) (7.6 ) (18.5 ) (63.1 ) Three Months Ended September 30, 2015: Net sales $ 1,764.7 $ 1,483.9 $ 252.5 $ — $ 3,501.1 Income (loss) from operations (1) 124.0 104.2 5.0 (28.6 ) 204.6 Depreciation and amortization expense (25.8 ) (11.2 ) (7.5 ) (15.4 ) (59.9 ) (in millions) Corporate Public Other Headquarters Total Nine Months Ended September 30, 2016: Net sales $ 5,220.3 $ 4,257.1 $ 1,012.1 $ — $ 10,489.5 Income (loss) from operations (1) 391.4 287.0 27.4 (83.8 ) 622.0 Depreciation and amortization expense (77.6 ) (33.5 ) (24.6 ) (55.0 ) (190.7 ) Nine Months Ended September 30, 2015: Net sales $ 5,173.6 $ 3,889.7 $ 507.0 $ — $ 9,570.3 Income (loss) from operations (1) 381.5 250.6 14.2 (84.2 ) 562.1 Depreciation and amortization expense (77.3 ) (33.5 ) (10.0 ) (44.2 ) (165.0 ) (1) Certain costs related to technology specialists have been reclassified between our Corporate and Public segments. Prior periods have been reclassified to conform to the current period presentation.

Supplemental Guarantor Informat

Supplemental Guarantor Information	9 Months Ended
	Sep. 30, 2016
Supplemental Guarantor Information [Abstract]
Supplemental Guarantor Information [Text Block]	9. Supplemental Guarantor Information The 2022 Senior Notes, the 2023 Senior Notes and the 2024 Senior Notes are, and, prior to being redeemed in full, the 2019 Senior Notes were, guaranteed by Parent and each of CDW LLC’s direct and indirect, 100% owned, domestic subsidiaries (the “Guarantor Subsidiaries”). All guarantees by Parent and the Guarantor Subsidiaries are and were joint and several, and full and unconditional; provided that guarantees by the Guarantor Subsidiaries (i) are subject to certain customary release provisions contained in the indentures governing the 2022 Senior Notes, the 2023 Senior Notes and the 2024 Senior Notes and (ii) were subject to certain customary release provisions contained in the indentures governing the 2019 Senior Notes until such indentures were satisfied and discharged in the first quarter of 2015. CDW LLC's 100% owned foreign subsidiaries, CDW International Holdings Limited, which is comprised of CDW UK and Canada (together the “Non-Guarantor Subsidiaries”), do not guarantee the debt obligations. CDW LLC and CDW Finance Corporation, as co-issuers, are 100% owned by Parent and each of the Guarantor Subsidiaries and the Non-Guarantor Subsidiaries are, directly or indirectly, 100% owned by CDW LLC. The following tables set forth condensed Consolidating Balance Sheets as of September 30, 2016 and December 31, 2015, Consolidating Statements of Operations for the three and nine months ended September 30, 2016 and 2015 , condensed Consolidating Statements of Comprehensive Income for the three and nine months ended September 30, 2016 and 2015 and condensed Consolidating Statements of Cash Flows for the nine months ended September 30, 2016 and 2015 , in accordance with Rule 3-10 of Regulation S-X. The consolidating financial information includes the accounts of CDW Corporation (the “Parent Guarantor”), which has no independent assets or operations, the accounts of CDW LLC (the “Subsidiary Issuer”), the combined accounts of the Guarantor Subsidiaries, the accounts of the Non-Guarantor Subsidiaries, and the accounts of CDW Finance Corporation (the “Co-Issuer”) for the periods indicated. The information was prepared on the same basis as the Consolidated Financial Statements. Condensed Consolidating Balance Sheet September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Assets Current assets: Cash and cash equivalents $ — $ 102.3 $ — $ 36.0 $ — $ (20.0 ) $ 118.3 Accounts receivable, net — — 1,816.9 202.9 — — 2,019.8 Merchandise inventory — — 400.3 51.3 — — 451.6 Miscellaneous receivables — 98.2 154.5 16.7 — — 269.4 Prepaid expenses and other — 14.1 91.1 33.5 — — 138.7 Total current assets — 214.6 2,462.8 340.4 — (20.0 ) 2,997.8 Property and equipment, net — 104.3 48.8 9.4 — — 162.5 Goodwill — 751.8 1,439.0 277.1 — — 2,467.9 Other intangible assets, net — 296.0 599.9 214.7 — — 1,110.6 Other assets 3.3 16.3 248.1 1.5 — (235.2 ) 34.0 Investment in and advances to subsidiaries 987.2 3,105.1 — — — (4,092.3 ) — Total assets $ 990.5 $ 4,488.1 $ 4,798.6 $ 843.1 $ — $ (4,347.5 ) $ 6,772.8 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable—trade $ — $ 21.0 $ 879.4 $ 117.3 $ — $ (20.0 ) $ 997.7 Accounts payable—inventory financing — 1.0 469.4 7.3 — — 477.7 Current maturities of long-term debt — 14.9 3.6 — — — 18.5 Deferred revenue — — 114.5 65.6 — — 180.1 Accrued expenses — 192.0 218.0 42.8 — — 452.8 Total current liabilities — 228.9 1,684.9 233.0 — (20.0 ) 2,126.8 Long-term liabilities: Debt — 3,138.8 12.2 71.9 — — 3,222.9 Deferred income taxes — 100.6 225.7 70.2 — (3.3 ) 393.2 Other liabilities — 32.6 3.5 235.2 — (231.9 ) 39.4 Total long-term liabilities — 3,272.0 241.4 377.3 — (235.2 ) 3,655.5 Total stockholders’ equity 990.5 987.2 2,872.3 232.8 — (4,092.3 ) 990.5 Total liabilities and stockholders’ equity $ 990.5 $ 4,488.1 $ 4,798.6 $ 843.1 $ — $ (4,347.5 ) $ 6,772.8 Condensed Consolidating Balance Sheet December 31, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Assets Current assets: Cash and cash equivalents $ — $ 45.1 $ — $ 31.9 $ — $ (39.4 ) $ 37.6 Accounts receivable, net — — 1,788.6 228.8 — — 2,017.4 Merchandise inventory — — 340.3 52.8 — — 393.1 Miscellaneous receivables — 83.7 90.1 24.6 — — 198.4 Prepaid expenses and other — 13.0 50.4 84.0 — (3.1 ) 144.3 Total current assets — 141.8 2,269.4 422.1 — (42.5 ) 2,790.8 Property and equipment, net — 110.0 54.1 11.3 — — 175.4 Goodwill — 751.8 1,439.0 309.6 — — 2,500.4 Other intangible assets, net — 306.0 704.9 265.5 — — 1,276.4 Other assets 3.8 17.3 263.0 3.0 — (274.8 ) 12.3 Investment in and advances to subsidiaries 1,092.1 3,302.0 — — — (4,394.1 ) — Total assets $ 1,095.9 $ 4,628.9 $ 4,730.4 $ 1,011.5 $ — $ (4,711.4 ) $ 6,755.3 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable-trade $ — $ 31.0 $ 727.4 $ 147.5 $ — $ (39.4 ) $ 866.5 Accounts payable-inventory financing — — 428.4 11.4 — (0.2 ) 439.6 Current maturities of long-term debt — 15.4 — 11.8 — — 27.2 Deferred revenue — — 77.4 74.5 — — 151.9 Accrued expenses — 156.0 190.9 58.6 — (3.4 ) 402.1 Total current liabilities — 202.4 1,424.1 303.8 — (43.0 ) 1,887.3 Long-term liabilities: Debt — 3,156.5 — 76.0 — — 3,232.5 Deferred income taxes — 117.3 272.8 83.4 — (3.9 ) 469.6 Other liabilities — 60.7 2.9 276.8 — (270.4 ) 70.0 Total long-term liabilities — 3,334.5 275.7 436.2 — (274.3 ) 3,772.1 Total stockholders’ equity 1,095.9 1,092.0 3,030.6 271.5 — (4,394.1 ) 1,095.9 Total liabilities and stockholders’ equity $ 1,095.9 $ 4,628.9 $ 4,730.4 $ 1,011.5 $ — $ (4,711.4 ) $ 6,755.3 Consolidating Statement of Operations Three Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 3,389.6 $ 318.6 $ — $ — $ 3,708.2 Cost of sales — — 2,828.7 265.2 — — 3,093.9 Gross profit — — 560.9 53.4 — — 614.3 Selling and administrative expenses — 30.0 262.1 42.8 — — 334.9 Advertising expense — — 40.9 1.0 — — 41.9 Income (loss) from operations — (30.0 ) 257.9 9.6 — — 237.5 Interest (expense) income, net — (37.6 ) 1.8 (1.8 ) — — (37.6 ) Net loss on extinguishments of long-term debt — (2.1 ) — — — — (2.1 ) Other income (expense), net — 0.7 0.3 (0.6 ) — — 0.4 Income (loss) before income taxes — (69.0 ) 260.0 7.2 — — 198.2 Income tax benefit (expense) — 27.6 (99.4 ) (0.5 ) — — (72.3 ) Income (loss) before equity in earnings of subsidiaries — (41.4 ) 160.6 6.7 — — 125.9 Equity in earnings of subsidiaries 125.9 167.3 — — — (293.2 ) — Net income $ 125.9 $ 125.9 $ 160.6 $ 6.7 $ — $ (293.2 ) $ 125.9 Consolidating Statement of Operations Three Months Ended September 30, 2015 (1) (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 3,248.6 $ 252.5 $ — $ — $ 3,501.1 Cost of sales — — 2,720.4 213.5 — — 2,933.9 Gross profit — — 528.2 39.0 — — 567.2 Selling and administrative expenses — 26.3 261.7 33.4 — — 321.4 Advertising expense — — 39.8 1.4 — — 41.2 Income (loss) from operations — (26.3 ) 226.7 4.2 — — 204.6 Interest (expense) income, net — (37.9 ) 0.9 (1.5 ) — — (38.5 ) Gain on remeasurement of equity investment — — — 98.1 — — 98.1 Other income (expense), net — (18.8 ) 0.4 0.4 — — (18.0 ) Income (loss) before income taxes — (83.0 ) 228.0 101.2 — — 246.2 Income tax benefit (expense) — 31.3 (86.0 ) (40.6 ) — — (95.3 ) Income (loss) before equity in earnings of subsidiaries — (51.7 ) 142.0 60.6 — — 150.9 Equity in earnings of subsidiaries 150.9 202.6 — — — (353.5 ) — Net income $ 150.9 $ 150.9 $ 142.0 $ 60.6 $ — $ (353.5 ) $ 150.9 (1) Certain amounts have been reclassified to conform to the current period presentation. Consolidating Statement of Operations Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 9,477.4 $ 1,012.1 $ — $ — $ 10,489.5 Cost of sales — — 7,891.6 848.6 — — 8,740.2 Gross profit — — 1,585.8 163.5 — — 1,749.3 Selling and administrative expenses — 83.1 793.2 132.7 — — 1,009.0 Advertising expense — — 114.5 3.8 — — 118.3 Income (loss) from operations — (83.1 ) 678.1 27.0 — — 622.0 Interest (expense) income, net — (112.4 ) 5.6 (5.8 ) — — (112.6 ) Net loss on extinguishments of long-term debt — (2.1 ) — — — — (2.1 ) Other income, net — 0.7 1.0 0.6 — — 2.3 Income (loss) before income taxes — (196.9 ) 684.7 21.8 — — 509.6 Income tax benefit (expense) — 76.2 (259.9 ) (4.7 ) — — (188.4 ) Income (loss) before equity in earnings of subsidiaries — (120.7 ) 424.8 17.1 — — 321.2 Equity in earnings of subsidiaries 321.2 441.9 — — — (763.1 ) — Net income $ 321.2 $ 321.2 $ 424.8 $ 17.1 $ — $ (763.1 ) $ 321.2 Consolidating Statement of Operations Nine Months Ended September30, 2015 (1) (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 9,063.3 $ 507.0 $ — $ — $ 9,570.3 Cost of sales — — 7,574.6 437.5 — — 8,012.1 Gross profit — — 1,488.7 69.5 — — 1,558.2 Selling and administrative expenses — 81.5 753.1 52.9 — — 887.5 Advertising expense — — 105.4 3.2 — — 108.6 Income (loss) from operations — (81.5 ) 630.2 13.4 — — 562.1 Interest (expense) income, net — (120.7 ) 0.9 (1.3 ) — — (121.1 ) Net loss on extinguishments of long-term debt — (24.3 ) — — — — (24.3 ) Gain on remeasurement of equity investment — — — 98.1 — — 98.1 Other income (expense), net — (10.9 ) 1.4 — — — (9.5 ) Income (loss) before income taxes — (237.4 ) 632.5 110.2 — — 505.3 Income tax benefit (expense) — 89.1 (237.5 ) (43.1 ) — — (191.5 ) Income (loss) before equity in earnings of subsidiaries — (148.3 ) 395.0 67.1 — — 313.8 Equity in earnings of subsidiaries 313.8 462.1 — — — (775.9 ) — Net income $ 313.8 $ 313.8 $ 395.0 $ 67.1 $ — $ (775.9 ) $ 313.8 (1) Certain amounts have been reclassified to conform to the current period presentation. Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 114.0 $ 114.0 $ 160.6 $ (5.2 ) $ — $ (269.4 ) $ 114.0 Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 128.5 $ 128.5 $ 142.0 $ 38.2 $ — $ (308.7 ) $ 128.5 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 266.5 $ 266.5 $ 424.8 $ (37.6 ) $ — $ (653.7 ) $ 266.5 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 285.1 $ 285.1 $ 395.0 $ 38.4 $ — $ (718.5 ) $ 285.1 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net cash provided by (used in) operating activities $ — $ (91.9 ) $ 495.7 $ 62.8 $ — $ 32.7 $ 499.3 Cash flows from investing activities: Capital expenditures — (35.4 ) (3.2 ) (2.8 ) — — (41.4 ) Premium payments on interest rate cap agreements — (2.1 ) — — — — (2.1 ) Net cash used in investing activities — (37.5 ) (3.2 ) (2.8 ) — — (43.5 ) Cash flows from financing activities: Proceeds from borrowings under revolving credit facility — 329.7 — 2.4 — — 332.1 Repayments of borrowings under revolving credit facility — (329.7 ) — (2.4 ) — — (332.1 ) Repayments of long-term debt — (11.4 ) — (5.6 ) — — (17.0 ) Proceeds from the issuance of long-term debt — 1,483.0 — — — — 1,483.0 Payments to extinguish long-term debt — (1,490.4 ) — — — — (1,490.4 ) Net change in other long-term obligation — — 15.7 — — — 15.7 Payments of debt financing costs — (4.5 ) — (1.4 ) — — (5.9 ) Net change in accounts payable-inventory financing — 1.4 41.0 (3.2 ) — — 39.2 Proceeds from stock option exercises — 6.0 — — — — 6.0 Proceeds from Coworker Stock Purchase Plan — 6.9 — — — — 6.9 Repurchases of common stock (355.0 ) — — — — — (355.0 ) Dividends (53.1 ) — — — — — (53.1 ) Principal payments under capital lease obligations — — 0.8 (1.1 ) — — (0.3 ) Repayment of intercompany loan — — 40.4 (40.4 ) — — — Distributions and advances from (to) affiliates 408.1 195.6 (590.4 ) — — (13.3 ) — Net cash (used in) provided by financing activities — 186.6 (492.5 ) (51.7 ) — (13.3 ) (370.9 ) Effect of exchange rate changes on cash and cash equivalents — — — (4.2 ) — — (4.2 ) Net increase in cash and cash equivalents — 57.2 — 4.1 — 19.4 80.7 Cash and cash equivalents—beginning of period — 45.1 — 31.9 — (39.4 ) 37.6 Cash and cash equivalents—end of period $ — $ 102.3 $ — $ 36.0 $ — $ (20.0 ) $ 118.3 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net cash provided by (used in) operating activities $ — $ (36.2 ) $ 331.7 $ 47.1 $ — $ (47.7 ) $ 294.9 Cash flows from investing activities: Capital expenditures — (35.2 ) (7.4 ) (1.3 ) — — (43.9 ) Premium payments on interest rate cap agreements — (0.5 ) — — — — (0.5 ) Acquisition of business, net of cash acquired — — — (263.8 ) — — $ (263.8 ) Net cash used in investing activities — (35.7 ) (7.4 ) (265.1 ) — — (308.2 ) Cash flows from financing activities: Proceeds from borrowings under revolving credit facility — 105.0 — — — — $ 105.0 Repayments of borrowings under revolving credit facility — (105.0 ) — — — — $ (105.0 ) Repayments of long-term debt — (11.6 ) — (14.5 ) — — (26.1 ) Proceeds from issuance of long-term debt — 525.0 — — — — 525.0 Payments to extinguish long-term debt — (525.3 ) — — — — (525.3 ) Payment of debt financing costs — (6.8 ) — — — — (6.8 ) Net change in accounts payable - inventory financing — — 22.6 — — — 22.6 Proceeds from stock option exercises — 1.7 — — — — 1.7 Excess tax benefits from equity-based compensation — 0.4 — — — — 0.4 Proceeds from Coworker Stock Purchase Plan — 6.5 — — — — 6.5 Repurchases of common stock (193.3 ) — — — — — (193.3 ) Dividends (34.6 ) — — — — — (34.6 ) Distributions and advances from (to) affiliates 227.9 (218.3 ) (346.9 ) 263.6 — 73.7 — Net cash (used in) provided by financing activities — (228.4 ) (324.3 ) 249.1 — 73.7 (229.9 ) Effect of exchange rate changes on cash and cash equivalents — — — (3.8 ) — — (3.8 ) Net (decrease) increase in cash and cash equivalents — (300.3 ) — 27.3 — 26.0 (247.0 ) Cash and cash equivalents—beginning of period — 346.4 — 24.6 — (26.5 ) 344.5 Cash and cash equivalents—end of period $ — $ 46.1 $ — $ 51.9 $ — $ (0.5 ) $ 97.5

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 2, 2016, the Company announced that its Board of Directors declared a quarterly cash dividend of $0.16 per common share to be paid on December 12, 2016 to all stockholders of record as of the close of business on November 25, 2016 . Future dividends will be subject to Board of Directors approval.

Description Of Business And S19

Description Of Business And Summary Of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Description of Business and Summary of Significant Accounting Policies [Abstract]
Description of Business, Policy	Description of Business CDW Corporation (“Parent”) is a Fortune 500 company with multi-national capabilities and a leading provider of integrated information technology (“IT”) solutions to small, medium and large business, government, education and healthcare customers in the United States, Canada and the United Kingdom. The Company's offerings range from discrete hardware and software products to integrated IT solutions such as mobility, security, data center optimization, cloud computing, virtualization and collaboration. Throughout this report, the terms the “Company” and “CDW” refer to Parent and its 100% owned subsidiaries. Parent has two 100% owned subsidiaries, CDW LLC and CDW Finance Corporation. CDW LLC is an Illinois limited liability company that, together with its 100% owned subsidiaries, holds all material assets and conducts all business activities and operations of the Company. CDW Finance Corporation is a Delaware corporation formed for the sole purpose of acting as co-issuer of certain debt obligations and does not hold any material assets or engage in any business activities or operations. On August 1, 2015, the Company completed the acquisition of Kelway TopCo Limited (“Kelway”) by purchasing the remaining 65% of its outstanding common stock, which increased the Company’s ownership interest from 35% to 100% , and provided the Company control. On April 4, 2016, Kelway was rebranded CDW UK. Throughout this report, the term "CDW UK" refers to Kelway. For further details regarding the acquisition, see Note 3 (Acquisition).
Basis of Presentation, Policy	Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements as of September 30, 2016 and for the three and nine months ended September 30, 2016 and 2015 (the “Consolidated Financial Statements”) have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) for interim financial statements. Accordingly, certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. These Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2015 (the “December 31, 2015 Consolidated Financial Statements”). The significant accounting policies used in preparing these Consolidated Financial Statements were applied on a basis consistent with those reflected in the December 31, 2015 Consolidated Financial Statements. In the opinion of management, the Consolidated Financial Statements contain all adjustments (consisting of a normal, recurring nature) necessary to present fairly the Company's financial position, results of operations, comprehensive income, cash flows and changes in stockholders' equity as of the dates and for the periods indicated. The unaudited results of operations for such interim periods reported are not necessarily indicative of results for the full year.
Principles of Consolidation, Policy	Principles of Consolidation The accompanying Consolidated Financial Statements include the accounts of Parent and its 100% owned subsidiaries. All intercompany transactions and accounts are eliminated in consolidation.
Use of Estimates, Policy	Use of Estimates The preparation of the Consolidated Financial Statements in accordance with GAAP requires management to make use of certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the Consolidated Financial Statements and the reported amounts of revenue and expenses during the reported periods. The Company bases its estimates on historical experience and on various other assumptions that management believes are reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ from those estimates. The notes to the Consolidated Financial Statements contained in the December 31, 2015 Consolidated Financial Statements include an additional discussion of the significant accounting policies and estimates used in the preparation of the Company's Consolidated Financial Statements. There have been no material changes to the Company's significant accounting policies and estimates during the nine months ended September 30, 2016 .

Acquisition (Tables)

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Schedule of Consideration Transferred	A summary of the total consideration transferred is as follows: (in millions) Acquisition-Date Fair Value Cash $ 291.6 Fair value of CDW common stock (1) 33.2 Fair value of previously held equity investment on the date of acquisition (2) 174.9 Total consideration $ 499.7 (1) The Company issued 2 million shares of CDW common stock. The fair value of the common stock was based on the closing market price on July 31, 2015 , adjusted for the lack of marketability as the shares of CDW common stock issued to the sellers are subject to a three -year lock up restriction from August 1, 2015 . One of the sellers granted 1 million stock options to certain CDW UK coworkers over his shares of CDW common stock received in the transaction. The fair value of these stock options was $22 million , which has been accounted for as post-combination stock-based compensation and is being amortized over the weighted­-average requisite service period of 3.2 years. Compensation expense for these options is included in Selling and administrative expenses in the Consolidated Statements of Operations. (2) As a result of the Company obtaining control over CDW UK, the Company’s previously held 35% equity investment was remeasured to fair value, resulting in a gain of $98 million included in Gain on remeasurement of equity investment in the Consolidated Statements of Operations. The fair value of the previously held equity investment was determined by management with the assistance of a third party valuation firm, based on information available as of the acquisition date.
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The recognized amounts of identifiable assets acquired and liabilities assumed, translated using the foreign currency exchange rates on the date of acquisition, are as follows: (in millions) Acquisition-Date Fair Value (1) Cash $ 27.8 Accounts receivable 135.7 Merchandise inventory 27.1 Property and equipment, net 11.4 Identified intangible assets (2) 289.8 Other assets 53.5 Total assets acquired 545.3 Accounts payable—trade (86.1 ) Deferred revenue (57.2 ) Other liabilities (41.7 ) Deferred tax liabilities (55.1 ) Debt (111.5 ) Total liabilities assumed (351.6 ) Total identifiable net assets 193.7 Goodwill 306.0 Total purchase price $ 499.7 (1) The fair values assigned to the tangible and intangible assets acquired and liabilities assumed were based on management’s estimates and assumptions, as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques. (2) Details of the identified intangible assets are as follows: (in millions) Acquisition-Date Fair Value Weighted-Average Amortization Period (in years) Customer relationships $ 260.8 13 Customer contracts 25.9 3 Developed technology 1.7 2 Trade name 1.4 1 Total identified intangible assets $ 289.8
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	Details of the identified intangible assets are as follows: (in millions) Acquisition-Date Fair Value Weighted-Average Amortization Period (in years) Customer relationships $ 260.8 13 Customer contracts 25.9 3 Developed technology 1.7 2 Trade name 1.4 1 Total identified intangible assets $ 289.8
Business Acquisition, Pro Forma Information	The unaudited pro forma Consolidated Statements of Operations for the three and nine months ended September 30, 2015 is as follows: (in millions) Three months ended Nine months ended Net sales $ 3,585.5 $ 10,099.2 Net income 101.8 273.5

Inventory Financing Agreements

Inventory Financing Agreements (Tables)	9 Months Ended
	Sep. 30, 2016
Inventory Financing Agreements [Abstract]
Inventory Financing Agreements	(in millions) September 30, 2016 December 31, 2015 Revolving Loan inventory financing agreement (1) $ 468.2 $ 427.0 Other inventory financing agreements (2) 9.5 12.6 Accounts payable-inventory financing $ 477.7 $ 439.6 (1) The Senior Secured Asset-Based Revolving Credit Facility (“Revolving Loan”) includes an inventory floorplan sub-facility that enables the Company to maintain an inventory financing agreement with a financial intermediary to facilitate the purchase of inventory from certain vendors on more favorable terms than offered directly by the vendors. (2) As of September 30, 2016 and December 31, 2015 , amounts owed under other inventory financing agreements of $1 million or less, for both periods, were collateralized by the inventory purchased under these financing agreements and a second lien on the related accounts receivable.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Long-term Debt, Unclassified [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	Fair Value The fair values of the 2022, 2023 and 2024 Senior Notes were estimated using quoted market prices for identical liabilities that are traded in over-the-counter secondary markets that are not considered active. The fair value of the Term Loan was estimated using dealer quotes for identical liabilities in markets that are not considered active. Consequently, the Company's long-term debt is classified as Level 2 within the fair value hierarchy. The fair value of the CDW UK Term Loan was estimated using a discounted cash flow analysis based on current incremental borrowing rates for similar arrangements. The approximate fair values and related carrying values of the Company's long-term debt, including current maturities and excluding unamortized discount and unamortized deferred financing costs, were as follows: (in millions) September 30, 2016 December 31, Fair value $ 3,376.2 $ 3,330.4 Carrying value 3,275.0 3,286.5
Carrying Value of Long-Term Debt	Long-term debt as of September 30, 2016 is as follows: (dollars in millions) Interest Rate Principal Unamortized Discount and Deferred Financing Costs Total Senior secured asset-based revolving credit facility (1) — % $ — $ — $ — CDW UK revolving credit facility (2) — % — — — Senior secured term loan facility 3.00 % 1,486.7 (15.5 ) 1,471.2 CDW UK term loan 1.79 % 72.6 (0.6 ) 72.0 Senior notes due 2022 6.0 % 600.0 (5.9 ) 594.1 Senior notes due 2023 5.0 % 525.0 (5.5 ) 519.5 Senior notes due 2024 5.5 % 575.0 (6.1 ) 568.9 Other long-term obligations 15.7 — 15.7 Total debt 3,275.0 (33.6 ) 3,241.4 Less current maturities (18.5 ) — (18.5 ) Long-term debt, excluding current maturities $ 3,256.5 $ (33.6 ) $ 3,222.9 Long-term debt as of December 31, 2015 is as follows: (dollars in millions) Interest Principal Unamortized Discount and Deferred Financing Costs Total Senior secured asset-based revolving credit facility (1) — % $ — $ — $ — CDW UK revolving credit facility (2) — % — — — Senior secured term loan facility 3.25 % 1,498.1 (6.7 ) 1,491.4 CDW UK Term Loan 1.98 % 88.4 (0.6 ) 87.8 Senior notes due 2022 6.0 % 600.0 (6.6 ) 593.4 Senior notes due 2023 5.0 % 525.0 (6.2 ) 518.8 Senior notes due 2024 5.5 % 575.0 (6.7 ) 568.3 Total debt 3,286.5 (26.8 ) 3,259.7 Less current maturities (27.2 ) — (27.2 ) Long-term debt, excluding current maturities $ 3,259.3 $ (26.8 ) $ 3,232.5 (1) The Senior Secured Asset-Based Revolving Credit Facility includes an inventory floorplan sub-facility that enables the Company to maintain an inventory financing agreement with a financial intermediary to facilitate the purchase of inventory from certain vendors on more favorable terms than offered directly by the vendors. As of September 30, 2016 , the Company had no outstanding borrowings under the Revolving Loan, $1 million of undrawn letters of credit and $446 million reserved related to the floorplan sub-facility. As of September 30, 2016 , the borrowing base was $1,584 million based on the amount of eligible inventory and accounts receivable balances as of August 31, 2016. The Company could have borrowed up to an additional $802 million under the Revolving Loan as of September 30, 2016 . (2) The CDW UK Revolving Credit Facility is a multi-currency revolving credit facility expiring on August 1, 2021, under which CDW UK is permitted to borrow an aggregate amount of £ 50 million ( $65 million as of September 30, 2016 ).

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2016
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	A reconciliation of basic weighted-average shares outstanding to diluted weighted-average shares outstanding is as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2016 2015 2016 2015 Basic weighted-average shares outstanding 162.1 169.6 164.8 170.9 Effect of dilutive securities (1) 2.8 1.4 2.1 1.4 Diluted weighted-average shares outstanding (2) 164.9 171.0 166.9 172.3 (1) The dilutive effect of outstanding stock options, restricted stock units, restricted stock, performance share units and Coworker Stock Purchase Plan units is reflected in the diluted weighted-average shares outstanding using the treasury stock method. (2) There were less than 1 million potential common shares excluded from diluted weighted-average shares outstanding for the three and nine months ended September 30, 2016 and 2015, respectively, as their inclusion would have had an anti-dilutive effect.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting Information [Line Items]
Schedule of Segment Reporting Information, by Segment	Information about the Company’s segments for the three and nine months ended September 30, 2016 and 2015 is as follows: (in millions) Corporate Public Other Headquarters Total Three Months Ended September 30, 2016: Net sales $ 1,748.9 $ 1,640.6 $ 318.7 $ — $ 3,708.2 Income (loss) from operations (1) 138.0 120.0 10.0 (30.5 ) 237.5 Depreciation and amortization expense (25.8 ) (11.2 ) (7.6 ) (18.5 ) (63.1 ) Three Months Ended September 30, 2015: Net sales $ 1,764.7 $ 1,483.9 $ 252.5 $ — $ 3,501.1 Income (loss) from operations (1) 124.0 104.2 5.0 (28.6 ) 204.6 Depreciation and amortization expense (25.8 ) (11.2 ) (7.5 ) (15.4 ) (59.9 ) (in millions) Corporate Public Other Headquarters Total Nine Months Ended September 30, 2016: Net sales $ 5,220.3 $ 4,257.1 $ 1,012.1 $ — $ 10,489.5 Income (loss) from operations (1) 391.4 287.0 27.4 (83.8 ) 622.0 Depreciation and amortization expense (77.6 ) (33.5 ) (24.6 ) (55.0 ) (190.7 ) Nine Months Ended September 30, 2015: Net sales $ 5,173.6 $ 3,889.7 $ 507.0 $ — $ 9,570.3 Income (loss) from operations (1) 381.5 250.6 14.2 (84.2 ) 562.1 Depreciation and amortization expense (77.3 ) (33.5 ) (10.0 ) (44.2 ) (165.0 ) (1) Certain costs related to technology specialists have been reclassified between our Corporate and Public segments. Prior periods have been reclassified to conform to the current period presentation.

Supplemental Guarantor Inform25

Supplemental Guarantor Information (Tables)	9 Months Ended
	Sep. 30, 2016
Condensed Income Statements, Captions [Line Items]
Condensed Consolidating Balance Sheets	Condensed Consolidating Balance Sheet December 31, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Assets Current assets: Cash and cash equivalents $ — $ 45.1 $ — $ 31.9 $ — $ (39.4 ) $ 37.6 Accounts receivable, net — — 1,788.6 228.8 — — 2,017.4 Merchandise inventory — — 340.3 52.8 — — 393.1 Miscellaneous receivables — 83.7 90.1 24.6 — — 198.4 Prepaid expenses and other — 13.0 50.4 84.0 — (3.1 ) 144.3 Total current assets — 141.8 2,269.4 422.1 — (42.5 ) 2,790.8 Property and equipment, net — 110.0 54.1 11.3 — — 175.4 Goodwill — 751.8 1,439.0 309.6 — — 2,500.4 Other intangible assets, net — 306.0 704.9 265.5 — — 1,276.4 Other assets 3.8 17.3 263.0 3.0 — (274.8 ) 12.3 Investment in and advances to subsidiaries 1,092.1 3,302.0 — — — (4,394.1 ) — Total assets $ 1,095.9 $ 4,628.9 $ 4,730.4 $ 1,011.5 $ — $ (4,711.4 ) $ 6,755.3 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable-trade $ — $ 31.0 $ 727.4 $ 147.5 $ — $ (39.4 ) $ 866.5 Accounts payable-inventory financing — — 428.4 11.4 — (0.2 ) 439.6 Current maturities of long-term debt — 15.4 — 11.8 — — 27.2 Deferred revenue — — 77.4 74.5 — — 151.9 Accrued expenses — 156.0 190.9 58.6 — (3.4 ) 402.1 Total current liabilities — 202.4 1,424.1 303.8 — (43.0 ) 1,887.3 Long-term liabilities: Debt — 3,156.5 — 76.0 — — 3,232.5 Deferred income taxes — 117.3 272.8 83.4 — (3.9 ) 469.6 Other liabilities — 60.7 2.9 276.8 — (270.4 ) 70.0 Total long-term liabilities — 3,334.5 275.7 436.2 — (274.3 ) 3,772.1 Total stockholders’ equity 1,095.9 1,092.0 3,030.6 271.5 — (4,394.1 ) 1,095.9 Total liabilities and stockholders’ equity $ 1,095.9 $ 4,628.9 $ 4,730.4 $ 1,011.5 $ — $ (4,711.4 ) $ 6,755.3 Condensed Consolidating Balance Sheet September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Assets Current assets: Cash and cash equivalents $ — $ 102.3 $ — $ 36.0 $ — $ (20.0 ) $ 118.3 Accounts receivable, net — — 1,816.9 202.9 — — 2,019.8 Merchandise inventory — — 400.3 51.3 — — 451.6 Miscellaneous receivables — 98.2 154.5 16.7 — — 269.4 Prepaid expenses and other — 14.1 91.1 33.5 — — 138.7 Total current assets — 214.6 2,462.8 340.4 — (20.0 ) 2,997.8 Property and equipment, net — 104.3 48.8 9.4 — — 162.5 Goodwill — 751.8 1,439.0 277.1 — — 2,467.9 Other intangible assets, net — 296.0 599.9 214.7 — — 1,110.6 Other assets 3.3 16.3 248.1 1.5 — (235.2 ) 34.0 Investment in and advances to subsidiaries 987.2 3,105.1 — — — (4,092.3 ) — Total assets $ 990.5 $ 4,488.1 $ 4,798.6 $ 843.1 $ — $ (4,347.5 ) $ 6,772.8 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable—trade $ — $ 21.0 $ 879.4 $ 117.3 $ — $ (20.0 ) $ 997.7 Accounts payable—inventory financing — 1.0 469.4 7.3 — — 477.7 Current maturities of long-term debt — 14.9 3.6 — — — 18.5 Deferred revenue — — 114.5 65.6 — — 180.1 Accrued expenses — 192.0 218.0 42.8 — — 452.8 Total current liabilities — 228.9 1,684.9 233.0 — (20.0 ) 2,126.8 Long-term liabilities: Debt — 3,138.8 12.2 71.9 — — 3,222.9 Deferred income taxes — 100.6 225.7 70.2 — (3.3 ) 393.2 Other liabilities — 32.6 3.5 235.2 — (231.9 ) 39.4 Total long-term liabilities — 3,272.0 241.4 377.3 — (235.2 ) 3,655.5 Total stockholders’ equity 990.5 987.2 2,872.3 232.8 — (4,092.3 ) 990.5 Total liabilities and stockholders’ equity $ 990.5 $ 4,488.1 $ 4,798.6 $ 843.1 $ — $ (4,347.5 ) $ 6,772.8
Consolidating Statements of Operations	Consolidating Statement of Operations Three Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 3,389.6 $ 318.6 $ — $ — $ 3,708.2 Cost of sales — — 2,828.7 265.2 — — 3,093.9 Gross profit — — 560.9 53.4 — — 614.3 Selling and administrative expenses — 30.0 262.1 42.8 — — 334.9 Advertising expense — — 40.9 1.0 — — 41.9 Income (loss) from operations — (30.0 ) 257.9 9.6 — — 237.5 Interest (expense) income, net — (37.6 ) 1.8 (1.8 ) — — (37.6 ) Net loss on extinguishments of long-term debt — (2.1 ) — — — — (2.1 ) Other income (expense), net — 0.7 0.3 (0.6 ) — — 0.4 Income (loss) before income taxes — (69.0 ) 260.0 7.2 — — 198.2 Income tax benefit (expense) — 27.6 (99.4 ) (0.5 ) — — (72.3 ) Income (loss) before equity in earnings of subsidiaries — (41.4 ) 160.6 6.7 — — 125.9 Equity in earnings of subsidiaries 125.9 167.3 — — — (293.2 ) — Net income $ 125.9 $ 125.9 $ 160.6 $ 6.7 $ — $ (293.2 ) $ 125.9 Consolidating Statement of Operations Nine Months Ended September30, 2015 (1) (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 9,063.3 $ 507.0 $ — $ — $ 9,570.3 Cost of sales — — 7,574.6 437.5 — — 8,012.1 Gross profit — — 1,488.7 69.5 — — 1,558.2 Selling and administrative expenses — 81.5 753.1 52.9 — — 887.5 Advertising expense — — 105.4 3.2 — — 108.6 Income (loss) from operations — (81.5 ) 630.2 13.4 — — 562.1 Interest (expense) income, net — (120.7 ) 0.9 (1.3 ) — — (121.1 ) Net loss on extinguishments of long-term debt — (24.3 ) — — — — (24.3 ) Gain on remeasurement of equity investment — — — 98.1 — — 98.1 Other income (expense), net — (10.9 ) 1.4 — — — (9.5 ) Income (loss) before income taxes — (237.4 ) 632.5 110.2 — — 505.3 Income tax benefit (expense) — 89.1 (237.5 ) (43.1 ) — — (191.5 ) Income (loss) before equity in earnings of subsidiaries — (148.3 ) 395.0 67.1 — — 313.8 Equity in earnings of subsidiaries 313.8 462.1 — — — (775.9 ) — Net income $ 313.8 $ 313.8 $ 395.0 $ 67.1 $ — $ (775.9 ) $ 313.8 Consolidating Statement of Operations Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 9,477.4 $ 1,012.1 $ — $ — $ 10,489.5 Cost of sales — — 7,891.6 848.6 — — 8,740.2 Gross profit — — 1,585.8 163.5 — — 1,749.3 Selling and administrative expenses — 83.1 793.2 132.7 — — 1,009.0 Advertising expense — — 114.5 3.8 — — 118.3 Income (loss) from operations — (83.1 ) 678.1 27.0 — — 622.0 Interest (expense) income, net — (112.4 ) 5.6 (5.8 ) — — (112.6 ) Net loss on extinguishments of long-term debt — (2.1 ) — — — — (2.1 ) Other income, net — 0.7 1.0 0.6 — — 2.3 Income (loss) before income taxes — (196.9 ) 684.7 21.8 — — 509.6 Income tax benefit (expense) — 76.2 (259.9 ) (4.7 ) — — (188.4 ) Income (loss) before equity in earnings of subsidiaries — (120.7 ) 424.8 17.1 — — 321.2 Equity in earnings of subsidiaries 321.2 441.9 — — — (763.1 ) — Net income $ 321.2 $ 321.2 $ 424.8 $ 17.1 $ — $ (763.1 ) $ 321.2 Consolidating Statement of Operations Three Months Ended September 30, 2015 (1) (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net sales $ — $ — $ 3,248.6 $ 252.5 $ — $ — $ 3,501.1 Cost of sales — — 2,720.4 213.5 — — 2,933.9 Gross profit — — 528.2 39.0 — — 567.2 Selling and administrative expenses — 26.3 261.7 33.4 — — 321.4 Advertising expense — — 39.8 1.4 — — 41.2 Income (loss) from operations — (26.3 ) 226.7 4.2 — — 204.6 Interest (expense) income, net — (37.9 ) 0.9 (1.5 ) — — (38.5 ) Gain on remeasurement of equity investment — — — 98.1 — — 98.1 Other income (expense), net — (18.8 ) 0.4 0.4 — — (18.0 ) Income (loss) before income taxes — (83.0 ) 228.0 101.2 — — 246.2 Income tax benefit (expense) — 31.3 (86.0 ) (40.6 ) — — (95.3 ) Income (loss) before equity in earnings of subsidiaries — (51.7 ) 142.0 60.6 — — 150.9 Equity in earnings of subsidiaries 150.9 202.6 — — — (353.5 ) — Net income $ 150.9 $ 150.9 $ 142.0 $ 60.6 $ — $ (353.5 ) $ 150.9
Condensed Statement of Comprehensive Income [Table Text Block]	Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 114.0 $ 114.0 $ 160.6 $ (5.2 ) $ — $ (269.4 ) $ 114.0 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 266.5 $ 266.5 $ 424.8 $ (37.6 ) $ — $ (653.7 ) $ 266.5 Condensed Consolidating Statement of Comprehensive Income Nine Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 285.1 $ 285.1 $ 395.0 $ 38.4 $ — $ (718.5 ) $ 285.1 Condensed Consolidating Statement of Comprehensive Income Three Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Comprehensive income $ 128.5 $ 128.5 $ 142.0 $ 38.2 $ — $ (308.7 ) $ 128.5
Condensed Consolidating Statements Cash Flows	Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2015 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiary Co-Issuer Consolidating Adjustments Consolidated Net cash provided by (used in) operating activities $ — $ (36.2 ) $ 331.7 $ 47.1 $ — $ (47.7 ) $ 294.9 Cash flows from investing activities: Capital expenditures — (35.2 ) (7.4 ) (1.3 ) — — (43.9 ) Premium payments on interest rate cap agreements — (0.5 ) — — — — (0.5 ) Acquisition of business, net of cash acquired — — — (263.8 ) — — $ (263.8 ) Net cash used in investing activities — (35.7 ) (7.4 ) (265.1 ) — — (308.2 ) Cash flows from financing activities: Proceeds from borrowings under revolving credit facility — 105.0 — — — — $ 105.0 Repayments of borrowings under revolving credit facility — (105.0 ) — — — — $ (105.0 ) Repayments of long-term debt — (11.6 ) — (14.5 ) — — (26.1 ) Proceeds from issuance of long-term debt — 525.0 — — — — 525.0 Payments to extinguish long-term debt — (525.3 ) — — — — (525.3 ) Payment of debt financing costs — (6.8 ) — — — — (6.8 ) Net change in accounts payable - inventory financing — — 22.6 — — — 22.6 Proceeds from stock option exercises — 1.7 — — — — 1.7 Excess tax benefits from equity-based compensation — 0.4 — — — — 0.4 Proceeds from Coworker Stock Purchase Plan — 6.5 — — — — 6.5 Repurchases of common stock (193.3 ) — — — — — (193.3 ) Dividends (34.6 ) — — — — — (34.6 ) Distributions and advances from (to) affiliates 227.9 (218.3 ) (346.9 ) 263.6 — 73.7 — Net cash (used in) provided by financing activities — (228.4 ) (324.3 ) 249.1 — 73.7 (229.9 ) Effect of exchange rate changes on cash and cash equivalents — — — (3.8 ) — — (3.8 ) Net (decrease) increase in cash and cash equivalents — (300.3 ) — 27.3 — 26.0 (247.0 ) Cash and cash equivalents—beginning of period — 346.4 — 24.6 — (26.5 ) 344.5 Cash and cash equivalents—end of period $ — $ 46.1 $ — $ 51.9 $ — $ (0.5 ) $ 97.5 Condensed Consolidating Statement of Cash Flows Nine Months Ended September 30, 2016 (in millions) Parent Guarantor Subsidiary Issuer Guarantor Subsidiaries Non-Guarantor Subsidiaries Co-Issuer Consolidating Adjustments Consolidated Net cash provided by (used in) operating activities $ — $ (91.9 ) $ 495.7 $ 62.8 $ — $ 32.7 $ 499.3 Cash flows from investing activities: Capital expenditures — (35.4 ) (3.2 ) (2.8 ) — — (41.4 ) Premium payments on interest rate cap agreements — (2.1 ) — — — — (2.1 ) Net cash used in investing activities — (37.5 ) (3.2 ) (2.8 ) — — (43.5 ) Cash flows from financing activities: Proceeds from borrowings under revolving credit facility — 329.7 — 2.4 — — 332.1 Repayments of borrowings under revolving credit facility — (329.7 ) — (2.4 ) — — (332.1 ) Repayments of long-term debt — (11.4 ) — (5.6 ) — — (17.0 ) Proceeds from the issuance of long-term debt — 1,483.0 — — — — 1,483.0 Payments to extinguish long-term debt — (1,490.4 ) — — — — (1,490.4 ) Net change in other long-term obligation — — 15.7 — — — 15.7 Payments of debt financing costs — (4.5 ) — (1.4 ) — — (5.9 ) Net change in accounts payable-inventory financing — 1.4 41.0 (3.2 ) — — 39.2 Proceeds from stock option exercises — 6.0 — — — — 6.0 Proceeds from Coworker Stock Purchase Plan — 6.9 — — — — 6.9 Repurchases of common stock (355.0 ) — — — — — (355.0 ) Dividends (53.1 ) — — — — — (53.1 ) Principal payments under capital lease obligations — — 0.8 (1.1 ) — — (0.3 ) Repayment of intercompany loan — — 40.4 (40.4 ) — — — Distributions and advances from (to) affiliates 408.1 195.6 (590.4 ) — — (13.3 ) — Net cash (used in) provided by financing activities — 186.6 (492.5 ) (51.7 ) — (13.3 ) (370.9 ) Effect of exchange rate changes on cash and cash equivalents — — — (4.2 ) — — (4.2 ) Net increase in cash and cash equivalents — 57.2 — 4.1 — 19.4 80.7 Cash and cash equivalents—beginning of period — 45.1 — 31.9 — (39.4 ) 37.6 Cash and cash equivalents—end of period $ — $ 102.3 $ — $ 36.0 $ — $ (20.0 ) $ 118.3

Description Of Business And S26

Description Of Business And Summary Of Significant Accounting Policies Description of Business (Details) - Kelway TopCo Limited [Member]	Aug. 01, 2015
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	65.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	35.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	100.00%

Recent Accounting Pronounceme27

Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income Tax Benefit from Adoption of ASU	$ (72.3)	$ (95.3)	$ (188.4)	$ (191.5)
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income Tax Benefit from Adoption of ASU			$ (1.2)

Acquisition (Details)

Acquisition (Details) - Kelway TopCo Limited [Member] $ in Millions	Aug. 01, 2015USD ($)
Business Acquisition [Line Items]
Goodwill, Acquired During Period	$ 306
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	35.00%

Acquisition Ownership Acquired

Acquisition Ownership Acquired (Details) - Kelway TopCo Limited [Member] $ in Millions	Aug. 01, 2015USD ($)
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	65.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	35.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage	100.00%
Equity Awards Granted by Seller of Kelway [Member]
Business Acquisition [Line Items]
Fair value of options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition	$ 21.8

Acquisition Fair Value of Consi

Acquisition Fair Value of Consideration Transferred (Details) - Kelway TopCo Limited [Member] $ in Millions	Aug. 01, 2015USD ($)
Business Acquisition [Line Items]
Cash	$ 291.6
Fair value of CDW common stock	33.2
Fair value of previously held equity investment on the date of acquisition	174.9
Total consideration	$ 499.7

Acquisition Fair Value of Con31

Acquisition Fair Value of Consideration Transferred Footnotes (Details) - USD ($) shares in Millions, $ in Millions	Aug. 01, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Gain on remeasurement of equity investment		$ 0	$ 98.1	$ 0	$ 98.1
Kelway TopCo Limited [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1.6
Restriction period for common shares issued	3 years
Weighted-average service period of options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition	3 years 2 months 12 days
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage	35.00%
Gain on remeasurement of equity investment	$ 98.1
Equity Awards Granted by Seller of Kelway [Member] | Kelway TopCo Limited [Member]
Business Acquisition [Line Items]
Options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition	0.6
Fair value of options issued by one of the sellers to certain coworkers over shares of the seller's common stock received as part of consideration from acquisition	$ 21.8

Acquisition Fair Value Recogniz

Acquisition Fair Value Recognized Assets and Liabilities Assumed (Details) - Kelway TopCo Limited [Member] $ in Millions	Aug. 01, 2015USD ($)
Business Acquisition [Line Items]
Cash	$ 27.8
Accounts receivable	135.7
Merchandise inventory	27.1
Property and equipment, net	11.4
Identified intangible assets	289.8
Other assets	53.5
Total assets acquired	545.3
Accounts payable - trade	(86.1)
Deferred revenue	(57.2)
Other liabilities	(41.7)
Deferred tax liabilities	(55.1)
Debt	(111.5)
Total liabilities assumed	(351.6)
Total identifiable net assets	193.7
Goodwill	306
Total purchase price	$ 499.7

Acquisition Acquired Intangible

Acquisition Acquired Intangible Assets (Details) - Kelway TopCo Limited [Member] $ in Millions	Aug. 01, 2015USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 289.8
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 260.8
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	13 years
Customer Contracts [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 25.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Developed Technology Rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1.7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 1.4
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year

Acquisition Pro Forma Informati

Acquisition Pro Forma Information (Details) - Kelway TopCo Limited [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Pro Forma Information [Line Items]
Business Acquisition, Pro Forma Revenue	$ 3,585.5	$ 10,099.2
Business Acquisition, Pro Forma Net Income (Loss)	$ 101.8	$ 273.5

Inventory Financing Agreement35

Inventory Financing Agreements (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Inventory Financing Agreements [Line Items]
Accounts payable-inventory financing	$ 477.7	$ 439.6
Accounts Payable, Inventory Financing Collateralized [Member]
Inventory Financing Agreements [Line Items]
Other inventory financing agreements	1.2	1
Accounts Payable, Inventory Financing [Member]
Inventory Financing Agreements [Line Items]
Revolving Loan inventory financing agreement	468.2	427
Other inventory financing agreements	9.5	12.6
Accounts payable-inventory financing	$ 477.7	$ 439.6

Long-Term Debt -Debt Balances a

Long-Term Debt -Debt Balances and Interest Rates (Details) £ in Millions, $ in Millions	Sep. 30, 2016USD ($)	Sep. 30, 2016GBP (£)	Aug. 17, 2016USD ($)	Aug. 01, 2016GBP (£)	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Deferred Finance Costs, Net	$ (33.6)				$ (26.8)
Debt, short-term and long-term	3,256.5				3,259.3
Deferred Finance Costs, Net and Unamortized Premium | £		£ (0.5)
Deferred financing costs, net	(33.6)				(26.8)
Debt, Long-term and Short-term, Combined Amount					3,286.5
Current maturities of long-term debt	(18.5)				(27.2)
Deferred Finance Costs, Current, Net	0				0
Long-Term Debt, Current Maturities, Net of Deferred Financing Costs, Discount, or Premium	(18.5)				(27.2)
Long-term Debt, Excluding Current Maturities	3,222.9				3,232.5
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	3,241.4				3,259.7
Revolving Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	802
Deferred Finance Costs, Net	0				0
Debt, short-term and long-term	$ 0				$ 0
Long-term Debt, Weighted Average Interest Rate	0.00%	0.00%			0.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 0				$ 0
CDW UK Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	65	£ 50
Deferred Finance Costs, Net	0				0
Debt, short-term and long-term	$ 0				$ 0
Long-term Debt, Weighted Average Interest Rate	0.00%	0.00%			0.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 0				$ 0
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	1,486.7		$ 1,490.4		1,498.1
Deferred Finance Costs, Net and Unamortized Premium			$ 4.5
Deferred Finance Costs and Discount, Net	$ (15.5)				$ (6.7)
Long-term Debt, Weighted Average Interest Rate	3.00%	3.00%			3.25%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 1,471.2				$ 1,491.4
CDW UK Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	72.6
Deferred Finance Costs, Net and Unamortized Premium	(0.6)
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	72	£ 56		£ 56
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(5.5)				(6.2)
Debt, short-term and long-term	$ 525				$ 525
Long-term Debt, Weighted Average Interest Rate	5.00%	5.00%			5.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 519.5				$ 518.8
Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(5.9)				(6.6)
Debt, short-term and long-term	$ 600				$ 600
Long-term Debt, Weighted Average Interest Rate	6.00%	6.00%			6.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 594.1				$ 593.4
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(6.1)				(6.7)
Debt, short-term and long-term	$ 575				$ 575
Long-term Debt, Weighted Average Interest Rate	5.50%	5.50%			5.50%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 568.9				$ 568.3
Other long-term obligations [Domain]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	0
Debt, short-term and long-term	15.7
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	15.7
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Debt, Long-term and Short-term, Combined Amount	$ 3,275
LIBOR [Member] | CDW UK Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term					88.4
Deferred Finance Costs, Net and Unamortized Premium					$ (0.6)
Long-term Debt, Weighted Average Interest Rate	1.79%	1.79%			1.98%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium					$ 87.8
Accounts Payable, Inventory Financing [Member]
Debt Instrument [Line Items]
Revolving Loan financing agreement	$ 468.2				$ 427

Long-Term Debt -Revolving Loan

Long-Term Debt -Revolving Loan (Details) £ in Millions, $ in Millions	Sep. 30, 2016USD ($)	Sep. 30, 2016GBP (£)	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 3,256.5		$ 3,259.3
Revolving Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	0		0
Undrawn letters of credit	1
Borrowing Base	1,584
Availability under Revolving Loan	802
CDW UK Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	0		0
Availability under Revolving Loan	65	£ 50
Accounts Payable, Inventory Financing [Member]
Debt Instrument [Line Items]
Revolving Loan inventory financing agreement	468.2		$ 427
Accounts Payable, Inventory Financing [Member] | Revolving Loan [Member]
Debt Instrument [Line Items]
Amount owed under Revolving loan financing agreement	$ 446.5

Long-Term Debt -Term Loan (Deta

Long-Term Debt -Term Loan (Details) £ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016GBP (£)	Aug. 17, 2016USD ($)	Aug. 01, 2016GBP (£)	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Net Income free of restrictions under credit agreements	$ 679.7		$ 679.7
Debt, short-term and long-term	3,256.5		3,256.5					$ 3,259.3
Net loss on extinguishments of long-term debt	(2.1)	$ 0	(2.1)	$ (24.3)
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries	120.4		120.4
Proceeds from Issuance of Long-term Debt			1,483	$ 525
Discount, percent of par						99.50%
Deferred Finance Costs, Net | £					£ 0.5
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	3,241.4		3,241.4					3,259.7
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	1,486.7		$ 1,486.7			$ 1,490.4		$ 1,498.1
Net loss on extinguishments of long-term debt	$ (2.1)
Quarterly amortization payment of original principal, Percent	0.25%		0.25%		0.25%
Repayments of Debt	$ 3.7
Net leverage ratio	0		0		0
Long-term Debt, Weighted Average Interest Rate	3.00%		3.00%		3.00%			3.25%
Proceeds from Issuance of Long-term Debt	$ 1,490.4
Debt Instrument, Unamortized Discount						7.4
Deferred Finance Costs, Net						$ (4.5)
Deferred Finance Costs and Discount, Net	15.5		$ 15.5					$ 6.7
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	1,471.2		1,471.2					1,491.4
CDW UK Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	72.6		72.6
Repayments of Debt	5
Deferred Finance Costs, Net	$ 0.6		$ 0.6
Variable Interest Rate Margin	0.39%		0.39%		0.39%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 72		$ 72		£ 56		£ 56
CDW UK Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	0		0
Debt, short-term and long-term	$ 0		$ 0					$ 0
Long-term Debt, Weighted Average Interest Rate	0.00%		0.00%		0.00%			0.00%
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium	$ 0		$ 0					$ 0
Maximum [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Net leverage ratio	3.25		3.25		3.25
ABR [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Variable Interest Rate Margin	1.25%		1.25%		1.25%
LIBOR [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Reference Interest Rate Floor	0.75%		0.75%		0.75%
Variable Interest Rate Margin	2.25%		2.25%		2.25%
LIBOR [Member] | CDW UK Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term								$ 88.4
Long-term Debt, Weighted Average Interest Rate	1.79%		1.79%		1.79%			1.98%
Deferred Finance Costs, Net								$ 0.6
Long-Term Debt, Net of Deferred Financing Costs, Discount, or Premium								87.8
Cap agreement effective January 14, 2015-2017 [Member]
Debt Instrument [Line Items]
Interest Rate Cap, cap rate	2.00%		2.00%		2.00%
Interest Rate Cap, fair value	$ 1		$ 1					1
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Fair Value Disclosure	$ 3,376.2		$ 3,376.2					$ 3,330.4

Long-Term Debt -Interest Rate C

Long-Term Debt -Interest Rate Caps (Details) £ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016GBP (£)	Dec. 31, 2015USD ($)
Derivative [Line Items]
Deferred Finance Costs, Net | £			£ 0.5
Payments for Derivative Instrument	$ 2.1	$ 0.5
Cap agreement effective January 14, 2015-2017 [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 1,400
Interest Rate Cap, cap rate	2.00%		2.00%
Interest Rate Cap, fair value	$ 1			$ 1
Cap agreement effective 1/1/17-12/31/18 [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,200
Payments for Derivative Instrument	$ 2.1
Interest Rate Cap, cap rate	1.50%		1.50%
Interest Rate Cap, fair value	$ 1.8

Long-Term Debt -Senior Notes (D

Long-Term Debt -Senior Notes (Details) - USD ($) $ in Millions	Sep. 30, 2016	Aug. 17, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 3,256.5		$ 3,259.3
Deferred financing costs, net	33.6		26.8
Deferred Finance Costs, Net	33.6		26.8
Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 525		$ 525
Long-term Debt, Weighted Average Interest Rate	5.00%		5.00%
Deferred Finance Costs, Net	$ 5.5		$ 6.2
Term Loan [Member]
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 1,486.7	$ 1,490.4	$ 1,498.1
Long-term Debt, Weighted Average Interest Rate	3.00%		3.25%

Long-Term Debt Senior Subordina

Long-Term Debt Senior Subordinated Notes (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt, short-term and long-term	$ 3,256.5	$ 3,259.3

Long-Term Debt -Fair Value of L

Long-Term Debt -Fair Value of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Fair Value [Line Items]
Debt, Long-term and Short-term, Combined Amount		$ 3,286.5
Fair Value, Inputs, Level 2 [Member]
Fair Value [Line Items]
Long-term Debt, fair value disclosures	$ 3,376.2	$ 3,330.4

Earnings per Share (Details)

Earnings per Share (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Shares - Basic	162.1	169.6	164.8	170.9
Effect of dilutive securities	2.8	1.4	2.1	1.4
Weighted Average Shares - Diluted	164.9	171	166.9	172.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.1	0.1	0.2	0.5

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2015USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments			2
Number of operating segments which do not meet reportable unit quantitative threshold			2
Net Sales	$ 3,708.2	$ 3,501.1	$ 10,489.5	$ 9,570.3
Income (loss) from operations	237.5	204.6	622	562.1
Depreciation and amortization expense	(63.1)	(59.9)	(190.7)	(165)
Corporate [Member]
Segment Reporting Information [Line Items]
Net Sales	1,748.9	1,764.7	5,220.3	5,173.6
Income (loss) from operations	138	124	391.4	381.5
Depreciation and amortization expense	(25.8)	(25.8)	(77.6)	(77.3)
Public [Member]
Segment Reporting Information [Line Items]
Net Sales	1,640.6	1,483.9	4,257.1	3,889.7
Income (loss) from operations	120	104.2	287	250.6
Depreciation and amortization expense	(11.2)	(11.2)	(33.5)	(33.5)
Other [Member]
Segment Reporting Information [Line Items]
Net Sales	318.7	252.5	1,012.1	507
Income (loss) from operations	10	5	27.4	14.2
Depreciation and amortization expense	(7.6)	(7.5)	(24.6)	(10)
Headquarters [Member]
Segment Reporting Information [Line Items]
Net Sales	0	0	0	0
Income (loss) from operations	(30.5)	(28.6)	(83.8)	(84.2)
Depreciation and amortization expense	$ (18.5)	$ (15.4)	$ (55)	$ (44.2)

Supplemental Guarantor Inform45

Supplemental Guarantor Information -Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	$ 118.3	$ 37.6	$ 97.5	$ 344.5
Accounts receivable, net of allowance for doubtful accounts	2,019.8	2,017.4
Merchandise inventory	451.6	393.1
Miscellaneous receivables	269.4	198.4
Prepaid expenses and other	138.7	144.3
Total current assets	2,997.8	2,790.8
Property and equipment, net	162.5	175.4
Goodwill	2,467.9	2,500.4
Other intangible assets, net	1,110.6	1,276.4
Deferred financing costs, net	33.6	26.8
Other assets	34	12.3
Investment from and advances to subsidiaries	0	0
Total assets	6,772.8	6,755.3
Accounts payable-trade	997.7	866.5
Accounts payable-inventory financing	477.7	439.6
Current maturities of long-term debt	18.5	27.2
Deferred revenue	180.1	151.9
Accrued Expenses	452.8	402.1
Total current liabilities	2,126.8	1,887.3
Long-term Debt, Excluding Current Maturities	3,222.9	3,232.5
Deferred income taxes	393.2	469.6
Other liabilities	39.4	70
Total long-term liabilities	3,655.5	3,772.1
Total stockholders' equity	990.5	1,095.9
Total liabilities and stockholders' equity	6,772.8	6,755.3
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	(20)	(39.4)	(0.5)	(26.5)
Accounts receivable, net of allowance for doubtful accounts	0	0
Merchandise inventory	0	0
Miscellaneous receivables	0	0
Prepaid expenses and other	0	(3.1)
Total current assets	(20)	(42.5)
Property and equipment, net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other assets	(235.2)	(274.8)
Investment from and advances to subsidiaries	(4,092.3)	(4,394.1)
Total assets	(4,347.5)	(4,711.4)
Accounts payable-trade	(20)	(39.4)
Accounts payable-inventory financing	0	(0.2)
Current maturities of long-term debt	0	0
Deferred revenue	0	0
Accrued Expenses	0	(3.4)
Total current liabilities	(20)	(43)
Long-term Debt, Excluding Current Maturities	0	0
Deferred income taxes	(3.3)	(3.9)
Other liabilities	(231.9)	(270.4)
Total long-term liabilities	(235.2)	(274.3)
Total stockholders' equity	(4,092.3)	(4,394.1)
Total liabilities and stockholders' equity	(4,347.5)	(4,711.4)
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of allowance for doubtful accounts	0	0
Merchandise inventory	0	0
Miscellaneous receivables	0	0
Prepaid expenses and other	0	0
Total current assets	0	0
Property and equipment, net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other assets	3.3	3.8
Investment from and advances to subsidiaries	987.2	1,092.1
Total assets	990.5	1,095.9
Accounts payable-trade	0	0
Accounts payable-inventory financing	0	0
Current maturities of long-term debt	0	0
Deferred revenue	0	0
Accrued Expenses	0	0
Total current liabilities	0	0
Long-term Debt, Excluding Current Maturities	0	0
Deferred income taxes	0	0
Other liabilities	0	0
Total long-term liabilities	0	0
Total stockholders' equity	990.5	1,095.9
Total liabilities and stockholders' equity	990.5	1,095.9
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	102.3	45.1	46.1	346.4
Accounts receivable, net of allowance for doubtful accounts	0	0
Merchandise inventory	0	0
Miscellaneous receivables	98.2	83.7
Prepaid expenses and other	14.1	13
Total current assets	214.6	141.8
Property and equipment, net	104.3	110
Goodwill	751.8	751.8
Other intangible assets, net	296	306
Other assets	16.3	17.3
Investment from and advances to subsidiaries	3,105.1	3,302
Total assets	4,488.1	4,628.9
Accounts payable-trade	21	31
Accounts payable-inventory financing	1	0
Current maturities of long-term debt	14.9	15.4
Deferred revenue	0	0
Accrued Expenses	192	156
Total current liabilities	228.9	202.4
Long-term Debt, Excluding Current Maturities	3,138.8	3,156.5
Deferred income taxes	100.6	117.3
Other liabilities	32.6	60.7
Total long-term liabilities	3,272	3,334.5
Total stockholders' equity	987.2	1,092
Total liabilities and stockholders' equity	4,488.1	4,628.9
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of allowance for doubtful accounts	1,816.9	1,788.6
Merchandise inventory	400.3	340.3
Miscellaneous receivables	154.5	90.1
Prepaid expenses and other	91.1	50.4
Total current assets	2,462.8	2,269.4
Property and equipment, net	48.8	54.1
Goodwill	1,439	1,439
Other intangible assets, net	599.9	704.9
Other assets	248.1	263
Investment from and advances to subsidiaries	0	0
Total assets	4,798.6	4,730.4
Accounts payable-trade	879.4	727.4
Accounts payable-inventory financing	469.4	428.4
Current maturities of long-term debt	3.6	0
Deferred revenue	114.5	77.4
Accrued Expenses	218	190.9
Total current liabilities	1,684.9	1,424.1
Long-term Debt, Excluding Current Maturities	12.2	0
Deferred income taxes	225.7	272.8
Other liabilities	3.5	2.9
Total long-term liabilities	241.4	275.7
Total stockholders' equity	2,872.3	3,030.6
Total liabilities and stockholders' equity	4,798.6	4,730.4
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	36	31.9	51.9	24.6
Accounts receivable, net of allowance for doubtful accounts	202.9	228.8
Merchandise inventory	51.3	52.8
Miscellaneous receivables	16.7	24.6
Prepaid expenses and other	33.5	84
Total current assets	340.4	422.1
Property and equipment, net	9.4	11.3
Goodwill	277.1	309.6
Other intangible assets, net	214.7	265.5
Other assets	1.5	3
Investment from and advances to subsidiaries	0	0
Total assets	843.1	1,011.5
Accounts payable-trade	117.3	147.5
Accounts payable-inventory financing	7.3	11.4
Current maturities of long-term debt	0	11.8
Deferred revenue	65.6	74.5
Accrued Expenses	42.8	58.6
Total current liabilities	233	303.8
Long-term Debt, Excluding Current Maturities	71.9	76
Deferred income taxes	70.2	83.4
Other liabilities	235.2	276.8
Total long-term liabilities	377.3	436.2
Total stockholders' equity	232.8	271.5
Total liabilities and stockholders' equity	843.1	1,011.5
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net of allowance for doubtful accounts	0	0
Merchandise inventory	0	0
Miscellaneous receivables	0	0
Prepaid expenses and other	0	0
Total current assets	0	0
Property and equipment, net	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other assets	0	0
Investment from and advances to subsidiaries	0	0
Total assets	0	0
Accounts payable-trade	0	0
Accounts payable-inventory financing	0	0
Current maturities of long-term debt	0	0
Deferred revenue	0	0
Accrued Expenses	0	0
Total current liabilities	0	0
Long-term Debt, Excluding Current Maturities	0	0
Deferred income taxes	0	0
Other liabilities	0	0
Total long-term liabilities	0	0
Total stockholders' equity	0	0
Total liabilities and stockholders' equity	$ 0	$ 0

Supplemental Guarantor Inform46

Supplemental Guarantor Information -Consolidating Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Supplemental Guarantor Information [Line Items]
Net Sales	$ 3,708.2	$ 3,501.1	$ 10,489.5	$ 9,570.3
Cost of sales	3,093.9	2,933.9	8,740.2	8,012.1
Gross profit	614.3	567.2	1,749.3	1,558.2
Selling and administrative expenses	334.9	321.4	1,009	887.5
Advertising expense	41.9	41.2	118.3	108.6
Income from operations	237.5	204.6	622	562.1
Interest Income (Expense), Net	(37.6)	(38.5)	(112.6)	(121.1)
Net loss on extinguishments of long-term debt	(2.1)	0	(2.1)	(24.3)
Gain on remeasurement of equity investment	0	98.1	0	98.1
Other income (loss), net	0.4	(18)	2.3	(9.5)
Income (loss) before income taxes	198.2	246.2	509.6	505.3
Income Tax Expense (Benefit)	72.3	95.3	188.4	191.5
Income (Loss) before equity in earnings (loss) of subsidiaries	125.9	150.9	321.2	313.8
Equity in Earnings (Loss) of Subsidiaries	0	0	0	0
Net income (loss)	125.9	150.9	321.2	313.8
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling and administrative expenses	0	0	0	0
Advertising expense	0	0	0	0
Income from operations	0	0	0	0
Interest Income (Expense), Net	0	0	0	0
Net loss on extinguishments of long-term debt	0		0	0
Gain on remeasurement of equity investment		0		0
Other income (loss), net	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Income (Loss) before equity in earnings (loss) of subsidiaries	0	0	0	0
Equity in Earnings (Loss) of Subsidiaries	(293.2)	(353.5)	(763.1)	(775.9)
Net income (loss)	(293.2)	(353.5)	(763.1)	(775.9)
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling and administrative expenses	0	0	0	0
Advertising expense	0	0	0	0
Income from operations	0	0	0	0
Interest Income (Expense), Net	0	0	0	0
Net loss on extinguishments of long-term debt	0		0	0
Gain on remeasurement of equity investment		0		0
Other income (loss), net	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Income (Loss) before equity in earnings (loss) of subsidiaries	0	0	0	0
Equity in Earnings (Loss) of Subsidiaries	125.9	150.9	321.2	313.8
Net income (loss)	125.9	150.9	321.2	313.8
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling and administrative expenses	30	26.3	83.1	81.5
Advertising expense	0	0	0	0
Income from operations	(30)	(26.3)	(83.1)	(81.5)
Interest Income (Expense), Net	(37.6)	(37.9)	(112.4)	(120.7)
Net loss on extinguishments of long-term debt	(2.1)		(2.1)	(24.3)
Gain on remeasurement of equity investment		0		0
Other income (loss), net	0.7	(18.8)	0.7	(10.9)
Income (loss) before income taxes	(69)	(83)	(196.9)	(237.4)
Income Tax Expense (Benefit)	(27.6)	(31.3)	(76.2)	(89.1)
Income (Loss) before equity in earnings (loss) of subsidiaries	(41.4)	(51.7)	(120.7)	(148.3)
Equity in Earnings (Loss) of Subsidiaries	167.3	202.6	441.9	462.1
Net income (loss)	125.9	150.9	321.2	313.8
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	3,389.6	3,248.6	9,477.4	9,063.3
Cost of sales	2,828.7	2,720.4	7,891.6	7,574.6
Gross profit	560.9	528.2	1,585.8	1,488.7
Selling and administrative expenses	262.1	261.7	793.2	753.1
Advertising expense	40.9	39.8	114.5	105.4
Income from operations	257.9	226.7	678.1	630.2
Interest Income (Expense), Net	1.8	0.9	5.6	0.9
Net loss on extinguishments of long-term debt	0		0	0
Gain on remeasurement of equity investment		0		0
Other income (loss), net	0.3	0.4	1	1.4
Income (loss) before income taxes	260	228	684.7	632.5
Income Tax Expense (Benefit)	99.4	86	259.9	237.5
Income (Loss) before equity in earnings (loss) of subsidiaries	160.6	142	424.8	395
Equity in Earnings (Loss) of Subsidiaries	0	0	0	0
Net income (loss)	160.6	142	424.8	395
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	318.6	252.5	1,012.1	507
Cost of sales	265.2	213.5	848.6	437.5
Gross profit	53.4	39	163.5	69.5
Selling and administrative expenses	42.8	33.4	132.7	52.9
Advertising expense	1	1.4	3.8	3.2
Income from operations	9.6	4.2	27	13.4
Interest Income (Expense), Net	(1.8)	(1.5)	(5.8)	(1.3)
Net loss on extinguishments of long-term debt	0		0	0
Gain on remeasurement of equity investment		98.1		98.1
Other income (loss), net	(0.6)	0.4	0.6	0
Income (loss) before income taxes	7.2	101.2	21.8	110.2
Income Tax Expense (Benefit)	0.5	40.6	4.7	43.1
Income (Loss) before equity in earnings (loss) of subsidiaries	6.7	60.6	17.1	67.1
Equity in Earnings (Loss) of Subsidiaries	0	0	0	0
Net income (loss)	6.7	60.6	17.1	67.1
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net Sales	0	0	0	0
Cost of sales	0	0	0	0
Gross profit	0	0	0	0
Selling and administrative expenses	0	0	0	0
Advertising expense	0	0	0	0
Income from operations	0	0	0	0
Interest Income (Expense), Net	0	0	0	0
Net loss on extinguishments of long-term debt	0		0	0
Gain on remeasurement of equity investment		0		0
Other income (loss), net	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income Tax Expense (Benefit)	0	0	0	0
Income (Loss) before equity in earnings (loss) of subsidiaries	0	0	0	0
Equity in Earnings (Loss) of Subsidiaries	0	0	0	0
Net income (loss)	$ 0	$ 0	$ 0	0
Consolidated Entities [Member]
Supplemental Guarantor Information [Line Items]
Gain on remeasurement of equity investment				$ 98.1

Supplemental Guarantor Inform47

Supplemental Guarantor Information -Condensed Consolidating Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 114	$ 128.5	$ 266.5	$ 285.1
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(269.4)	(308.7)	(653.7)	(718.5)
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	114	128.5	266.5	285.1
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	114	128.5	266.5	285.1
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	160.6	142	424.8	395
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	(5.2)	38.2	(37.6)	38.4
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Comprehensive income (loss)	$ 0	$ 0	$ 0	$ 0

Supplemental Guarantor Inform48

Supplemental Guarantor Information -Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	$ 499.3	$ 294.9
Capital Expenditures	(41.4)	(43.9)
Payments for Derivative Instrument, Investing Activities	(2.1)	(0.5)
Payments to Acquire Businesses, Net of Cash Acquired	0	(263.8)
Net cash used in investing activities	(43.5)	(308.2)
Proceeds from Lines of Credit	332.1	105
Repayments of Lines of Credit	(332.1)	(105)
Repayments of long-term debt	(17)	(26.1)
Proceeds from Issuance of Long-term Debt	1,483	525
Repayments of Long-term Debt	(1,490.4)	(525.3)
Proceeds from (Repayments of) Other Long-term Debt	15.7	0
Payments of Financing Costs	(5.9)	(6.8)
Net change in accounts payable-inventory financing	39.2	22.6
Proceeds from stock option exercises	6	1.7
Proceeds from Coworker Stock Purchase Plan	6.9	6.5
Stock Repurchased and Retired During Period, Value	(355)	(193.3)
Payments of Ordinary Dividends, Common Stock	(53.1)	(34.6)
Proceeds from (Payments for) Other Financing Activities	(0.3)	0
Payments for (Proceeds from) Intercompany Loan	0
Excess Tax Benefit from Share-based Compensation, Financing Activities	0	0.4
Advances from (to) affiliates	0	0
Net cash used in financing activities	(370.9)	(229.9)
Effect of exchange rate changes on cash and cash equivalents	(4.2)	(3.8)
Net increase (decrease) in cash and cash equivalents	80.7	(247)
Cash and cash equivalents - beginning of period	37.6	344.5
Cash and cash equivalents - end of period	118.3	97.5
Consolidating Adjustments [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	32.7	(47.7)
Capital Expenditures	0	0
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	0
Payments of Financing Costs	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Stock Repurchased and Retired During Period, Value	0	0
Payments of Ordinary Dividends, Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0
Payments for (Proceeds from) Intercompany Loan	0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Advances from (to) affiliates	(13.3)	73.7
Net cash used in financing activities	(13.3)	73.7
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	19.4	26
Cash and cash equivalents - beginning of period	(39.4)	(26.5)
Cash and cash equivalents - end of period	(20)	(0.5)
Parent Guarantor [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	0	0
Capital Expenditures	0	0
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	0
Payments of Financing Costs	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Stock Repurchased and Retired During Period, Value	(355)	(193.3)
Payments of Ordinary Dividends, Common Stock	(53.1)	(34.6)
Proceeds from (Payments for) Other Financing Activities	0
Payments for (Proceeds from) Intercompany Loan	0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Advances from (to) affiliates	408.1	227.9
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Subsidiary Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	(91.9)	(36.2)
Capital Expenditures	(35.4)	(35.2)
Payments for Derivative Instrument, Investing Activities	(2.1)	(0.5)
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	(37.5)	(35.7)
Proceeds from Lines of Credit	329.7	105
Repayments of Lines of Credit	(329.7)	(105)
Repayments of long-term debt	(11.4)	(11.6)
Proceeds from Issuance of Long-term Debt	1,483	525
Repayments of Long-term Debt	(1,490.4)	(525.3)
Proceeds from (Repayments of) Other Long-term Debt	0
Payments of Financing Costs	(4.5)	(6.8)
Net change in accounts payable-inventory financing	1.4	0
Proceeds from stock option exercises	6	1.7
Proceeds from Coworker Stock Purchase Plan	6.9	6.5
Stock Repurchased and Retired During Period, Value	0	0
Payments of Ordinary Dividends, Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0
Payments for (Proceeds from) Intercompany Loan	0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0.4
Advances from (to) affiliates	195.6	(218.3)
Net cash used in financing activities	186.6	(228.4)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	57.2	(300.3)
Cash and cash equivalents - beginning of period	45.1	346.4
Cash and cash equivalents - end of period	102.3	46.1
Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	495.7	331.7
Capital Expenditures	(3.2)	(7.4)
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	(3.2)	(7.4)
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	15.7
Payments of Financing Costs	0	0
Net change in accounts payable-inventory financing	41	22.6
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Stock Repurchased and Retired During Period, Value	0	0
Payments of Ordinary Dividends, Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0.8
Payments for (Proceeds from) Intercompany Loan	40.4
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Advances from (to) affiliates	(590.4)	(346.9)
Net cash used in financing activities	(492.5)	(324.3)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	0	0
Non-Guarantor Subsidiaries [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	62.8	47.1
Capital Expenditures	(2.8)	(1.3)
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		(263.8)
Net cash used in investing activities	(2.8)	(265.1)
Proceeds from Lines of Credit	2.4	0
Repayments of Lines of Credit	(2.4)	0
Repayments of long-term debt	(5.6)	(14.5)
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	0
Payments of Financing Costs	(1.4)	0
Net change in accounts payable-inventory financing	(3.2)	0
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Stock Repurchased and Retired During Period, Value	0	0
Payments of Ordinary Dividends, Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	(1.1)
Payments for (Proceeds from) Intercompany Loan	(40.4)
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Advances from (to) affiliates	0	263.6
Net cash used in financing activities	(51.7)	249.1
Effect of exchange rate changes on cash and cash equivalents	(4.2)	(3.8)
Net increase (decrease) in cash and cash equivalents	4.1	27.3
Cash and cash equivalents - beginning of period	31.9	24.6
Cash and cash equivalents - end of period	36	51.9
Co-Issuer [Member]
Supplemental Guarantor Information [Line Items]
Net cash provided by operating activities	0	0
Capital Expenditures	0	0
Payments for Derivative Instrument, Investing Activities	0	0
Payments to Acquire Businesses, Net of Cash Acquired		0
Net cash used in investing activities	0	0
Proceeds from Lines of Credit	0	0
Repayments of Lines of Credit	0	0
Repayments of long-term debt	0	0
Proceeds from Issuance of Long-term Debt	0	0
Repayments of Long-term Debt	0	0
Proceeds from (Repayments of) Other Long-term Debt	0
Payments of Financing Costs	0	0
Net change in accounts payable-inventory financing	0	0
Proceeds from stock option exercises	0	0
Proceeds from Coworker Stock Purchase Plan	0	0
Stock Repurchased and Retired During Period, Value	0	0
Payments of Ordinary Dividends, Common Stock	0	0
Proceeds from (Payments for) Other Financing Activities	0
Payments for (Proceeds from) Intercompany Loan	0
Excess Tax Benefit from Share-based Compensation, Financing Activities		0
Advances from (to) affiliates	0	0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents - beginning of period	0	0
Cash and cash equivalents - end of period	$ 0	$ 0

Subsequent Events (Details)

Subsequent Events (Details)	3 Months Ended
	Dec. 31, 2016$ / shares
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.1600