CDW (CDW) 10-K 5 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 28, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'CDW Corp	'	'
Entity Central Index Key	'0001402057	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Public Float	'	'	$654,984,661
Entity Common Stock, Shares Outstanding	'	171,954,277	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current Assets:	'	'
Cash and cash equivalents	$188.10	$37.90
Accounts receivable, net of allowance for doubtful accounts	1,451	1,285
Merchandise inventory	382	314.6
Miscellaneous receivables	146.3	148.5
Deferred income taxes	0	14.1
Prepaid expenses and other	46.1	34.6
Total current assets	2,213.50	1,834.70
Property and equipment, net	131.1	142.7
Goodwill	2,220.30	2,209.30
Other intangible assets, net	1,328	1,478.50
Deferred financing costs, net	30.1	53.2
Other assets	1.6	1.6
Total assets	5,924.60	5,720
Current Liabilities:	'	'
Accounts payable-trade	662.8	518.6
Accounts payable-inventory financing	256.6	249.2
Current maturities of long-term debt	45.4	40
Deferred revenue	94.8	57.8
Accrued expenses:	'	'
Compensation	112.2	99.4
Interest	31.8	50.7
Sales taxes	29.2	22.6
Advertising	33.2	33.9
Income taxes	6.3	0.2
Other	130.3	95.8
Total current liabilities	1,402.60	1,168.20
Long-term liabilities:	'	'
Debt	3,205.80	3,731
Deferred income taxes	563.5	624.3
Other liabilities	41	60
Total long-term liabilities	3,810.30	4,415.30
Commitments and contingencies	'	'
Shareholders' deficit:	'	'
Preferred Stock, Value, Issued	0	0
Common shares	1.7	1.4
Paid-in capital	2,688.10	2,207.70
Accumulated deficit	-1,971.80	-2,073
Accumulated other comprehensive loss	-6.3	0.4
Total shareholders' deficit	711.7	136.5
Total liabilities and shareholders' deficit	$5,924.60	$5,720

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets Parenthetical (Parentheticals) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, except Per Share data, unless otherwise specified
Allowance for Doubtful Accounts Receivable, Current	$5.40	$5.40
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	100	0
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par Value	$0.01	$0.01
Common Stock, Shares Authorized	1,000	286.1
Common Stock, Shares, Issued	172	145.2
Common Stock, Shares, Outstanding	172	145.1

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)

3 Months Ended

12 Months Ended

In Millions, except Per Share data, unless otherwise specified

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Net Sales

'

$2,713.30

$2,864.30

$2,779.30

$2,411.70

$2,601

$2,623.30

$2,584.70

$2,319.20

$10,768.60

$10,128.20

$9,602.40

Cost of sales

'

'

'

'

'

'

'

'

'

9,008.30

8,458.60

8,018.90

Gross profit

'

448.3

458.4

451.6

402

425.4

432.7

426.9

384.6

1,760.30

1,669.60

1,583.50

Selling and administrative expenses

'

'

'

'

'

'

'

'

'

1,120.90

1,029.50

990.1

Advertising expense

'

'

'

'

'

'

'

'

'

130.8

129.5

122.7

Income (loss) from operations

'

142

92.9

[1]

153.6

120.1

130.9

139.7

136.4

103.6

508.6

510.6

470.7

Interest expense, net

'

'

'

'

'

'

'

'

'

-250.1

-307.4

-324.2

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

'

-64

-17.2

-118.9

Other income, net

'

'

'

'

'

'

'

'

'

1

0.1

0.7

Income (loss) before income taxes

'

'

'

'

'

'

'

'

'

195.5

186.1

28.3

Income tax (expense) benefit

'

'

'

'

'

'

'

'

'

-62.7

-67.1

-11.2

Net income (loss)

'

$60

($2.20)

[1]

$46.70

$28.30

$33.30

$38

$36.80

$10.90

$132.80

$119

$17.10

Basic

'

$0.35

[2]

($0.01)

[1],[2]

$0.32

[2]

$0.19

[2]

$0.23

[2]

$0.26

[2]

$0.25

[2]

$0.08

[2]

$0.85

$0.82

$0.12

Diluted

'

$0.35

[2]

($0.01)

[1],[2]

$0.32

[2]

$0.19

[2]

$0.23

[2]

$0.26

[2]

$0.25

[2]

$0.07

[2]

$0.84

$0.82

$0.12

Basic

'

'

'

'

'

'

'

'

'

156.6

145.1

144.8

Diluted

'

'

'

'

'

'

'

'

'

158.7

145.8

144.9

Cash dividends declared per common share

$0.04

'

'

'

'

'

'

'

'

$0.04

$0

$0

[1]

The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.

[2]

Basic and diluted net income (loss) per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income (loss) per share.

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income (loss)	$132.80	$119	$17.10
Reclassification of realized loss on interest rate swap agreements from accumulated other comprehensive loss to net income (loss), net of tax	0	0	1.9
Foreign currency translation adjustment	-6.7	2.5	-1.8
Other Comprehensive Income (Loss), Net of Tax	-6.7	2.5	0.1
Comprehensive income (loss)	$126.10	$121.50	$17.20

Consolidated_Statement_Of_Shar

Consolidated Statement Of Shareholders' (Deficit) Equity (USD $)	Total	Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Preferred Stock [Member]	Common Stock [Member]
In Millions, except Share data
Balance at at Dec. 31, 2010	($43.50)	$2,165.30	($2,208)	($2.20)	$0	$1.40
Preferred Stock, Shares Issued	'	'	'	'	0	'
Common Stock, Shares, Issued	'	'	'	'	'	144,900,000
Equity-based compensation expense	19.5	19.5	0	0	0	0
Stock Issued During Period, Shares, Equity-based compensation expense	'	'	'	'	0	0
Investment from CDW Holdings LLC	1	1	0	0	0	0
Stock Issued During Period, Shares, Investment from Parent	'	'	'	'	0	0
Repurchase of Class B Common Shares	-0.4	0	-0.4	0	0	0
Treasury Stock, Shares, Acquired	'	'	'	'	0	0
Accrued charitable contribution related to the MPK Coworker Incentive Plan II, net of tax	-1.1	-1.1	0	0	0	0
Stock Issued During Period, Shares, Accrued Charitable Contribution related to the MPK Coworker Incentive Plan II	'	'	'	'	0	300,000
Net income (loss)	17.1	0	17.1	0	0	0
Stock Issued During Period, Shares, Net Income (Loss) Attributable to Parent	'	'	'	'	0	0
Reclassification of realized loss on interest rate swap agreements from accumulated other comprehensive loss to net income (loss), net of tax	1.9	0	0	1.9	0	0
Stock Issued During Period, Shares, Reclassification Adjustment from AOCI to Derivatives	'	'	'	'	0	0
Foreign currency translation adjustment	-1.8	0	0	-1.8	0	0
Stock Issued During Period, Shares, Foreign Currency Translation Adjustment	'	'	'	'	0	0
Balance at at Dec. 31, 2011	-7.3	2,184.70	-2,191.30	-2.1	0	1.4
Preferred Stock, Shares Issued	0	'	'	'	0	'
Preferred Stock, Value, Issued	0	'	'	'	'	'
Common Stock, Value, Issued	1.4	'	'	'	'	'
Common Stock, Shares, Issued	145,200,000	'	'	'	'	145,200,000
Equity-based compensation expense	22.1	22.1	0	0	0	0
Stock Issued During Period, Shares, Equity-based compensation expense	'	'	'	'	0	0
Investment from CDW Holdings LLC	2.8	2.8	0	0	0	0
Stock Issued During Period, Shares, Investment from Parent	'	'	'	'	0	0
Repurchase of Class B Common Shares	-0.7	0	-0.7	0	0	0
Treasury Stock, Shares, Acquired	'	'	'	'	0	0
Accrued charitable contribution related to the MPK Coworker Incentive Plan II, net of tax	-1.4	-1.4	0	0	0	0
Stock Issued During Period, Shares, Accrued Charitable Contribution related to the MPK Coworker Incentive Plan II	'	'	'	'	0	300,000
MPK Coworker Incentive Plan II units withheld for taxes	-0.5	-0.5	0	0	0	0
Stock Issued During Period, Shares, Incentive Compensation Plan units withheld for taxes	'	'	'	'	0	0
Net income (loss)	119	0	119	0	0	0
Stock Issued During Period, Shares, Net Income (Loss) Attributable to Parent	'	'	'	'	0	0
Reclassification of realized loss on interest rate swap agreements from accumulated other comprehensive loss to net income (loss), net of tax	0	'	'	'	'	'
Foreign currency translation adjustment	2.5	0	0	2.5	0	0
Stock Issued During Period, Shares, Foreign Currency Translation Adjustment	'	'	'	'	0	0
Balance at at Dec. 31, 2012	136.5	2,207.70	-2,073	0.4	0	1.4
Preferred Stock, Shares Issued	0	'	'	'	0	'
Preferred Stock, Value, Issued	0	'	'	'	'	'
Common Stock, Value, Issued	1.7	'	'	'	'	'
Common Stock, Shares, Issued	172,000,000	'	'	'	'	172,000,000
Equity-based compensation expense	46.6	46.6	0	0	0	0
Stock Issued During Period, Shares, Equity-based compensation expense	'	'	'	'	0	0
Stock Issued During Period, Value, New Issues	424.7	424.4	0	0	0	0.3
Stock Issued During Period, Shares, New Issues	'	'	'	'	0	26,800,000
Repurchase of Class B Common Shares	-0.2	0	-0.2	0	0	0
Treasury Stock, Shares, Acquired	'	'	'	'	0	0
Dividends, Common Stock	-7.3	0	-7.3	0	0	0
Stock Dividends, Shares	'	'	'	'	0	0
Reclassification to goodwill for accrued charitable contributions	9.4	9.4	0	0	0	0
Stock Issued During Period, Shares, Reclassification to Goodwill for accrued charitable contributions	'	'	'	'	0	0
MPK Coworker Incentive Plan II units withheld for taxes	-24.1	0	-24.1	0	0	0
Stock Issued During Period, Shares, Incentive Compensation Plan units withheld for taxes	'	'	'	'	0	0
Net income (loss)	132.8	0	132.8	0	0	0
Stock Issued During Period, Shares, Net Income (Loss) Attributable to Parent	'	'	'	'	0	0
Reclassification of realized loss on interest rate swap agreements from accumulated other comprehensive loss to net income (loss), net of tax	0	'	'	'	'	'
Foreign currency translation adjustment	-6.7	0	0	-6.7	0	0
Stock Issued During Period, Shares, Foreign Currency Translation Adjustment	'	'	'	'	0	0
Balance at at Dec. 31, 2013	$711.70	$2,688.10	($1,971.80)	($6.30)	$0	$1.70

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income (loss)	$132.80	$119	$17.10
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization	208.2	210.2	204.9
Equity-based compensation expense	46.6	22.1	19.5
Deferred income taxes	-48.7	-56.3	-10.2
Allowance for doubtful accounts	0	0	0.4
Amortization of deferred financing costs	8.8	13.6	15.7
Net loss (gain) on extinguishments of long-term debt	64	17.2	118.9
Realized loss on interest rate swap agreements	0	0	2.8
Mark to market loss on interest rate derivatives	0.1	0.9	4.2
Net loss (gain) on sale and disposals of assets	0	0.1	0.3
Other	1.6	0	-0.6
Changes in assets and liabilities:	'	'	'
Accounts receivable	-170.8	-10.4	-183.4
Merchandise inventory	-67.5	7.1	-29
Other assets	-10.1	-3.8	50.3
Accounts payable-trade	146.1	0.8	-19.8
Other current liabilities	64.1	-2.1	39.6
Long-term liabilities	-8.9	-1	-16
Net cash provided by operating activities	366.3	317.4	214.7
Cash flows from investing activities:	'	'	'
Capital expenditures	-47.1	-41.4	-45.7
Cash settlements on interest rate swap agreements	0	0	-6.6
Premium payments on interest rate cap agreements	0	-0.3	-3.7
Net cash used in investing activities	-47.1	-41.7	-56
Cash flows from financing activities:	'	'	'
Proceeds from borrowings under revolving credit facility	63	289	1,295
Repayments of borrowings under revolving credit facility	-63	-289	-1,483.20
Repayments of long-term debt	-51.1	-201	-132
Proceeds from issuance of long-term debt	1,535.20	135.7	1,175
Payments to extinguish long-term debt	-2,047.40	-243.2	-1,175
Payments of debt financing costs	-6.1	-2.1	-26.3
Investment from CDW Holdings LLC	0	2.8	1
Net change in accounts payable-inventory financing	7.4	-29.5	250.5
Payment of incentive compensation plan withholding taxes	-24.1	0	0
Net proceeds from issuance of common shares	424.7	0	0
Repurchase of common shares	-0.2	-0.7	-0.4
Dividends paid	-7.3	0	0
Excess tax benefits from equity-based compensation	0.6	0	0
Net cash used in financing activities	-168.3	-338	-95.4
Effect of exchange rate changes on cash and cash equivalents	-0.7	0.3	0
Net increase (decrease) in cash and cash equivalents	150.2	-62	63.3
Cash and cash equivalents - beginning of period	37.9	99.9	36.6
Cash and cash equivalents - end of period	188.1	37.9	99.9
Supplementary disclosure of cash flow information:	'	'	'
Interest paid, including cash settlements on interest rate swap agreements	-267.6	-302.7	-332.9
Taxes refunded (paid), net	-82.5	-123.2	20.9
Non-cash investing and financing activities:	'	'	'
Capital expenditures accrued in accounts payable-trade	$0.20	$0.50	$1.10

Description_Of_Business_And_Su

Description Of Business And Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
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 is a Fortune 500 company and a leading provider of integrated information technology (“IT”) solutions to small, medium and large business, government, education and healthcare customers in the U.S. and Canada. 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.
	Basis of Presentation
	The accompanying 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 (“SEC”).
	On October 12, 2007, CDW Corporation, an Illinois corporation, was acquired through a merger transaction by an entity controlled by investment funds affiliated with Madison Dearborn Partners, LLC and Providence Equity Partners L.L.C. (the “Acquisition”). CDW Corporation continued as the surviving corporation and same legal entity after the Acquisition, but became a wholly owned subsidiary of VH Holdings, Inc., a Delaware corporation.
	On December 31, 2009, CDW Corporation merged into CDWC LLC, an Illinois limited liability company owned by VH Holdings, Inc., with CDWC LLC as the surviving entity. This change had no impact on the operations or management of the Company. On December 31, 2009, CDWC LLC was renamed CDW LLC (“CDW LLC”). On August 17, 2010, VH Holdings, Inc. was renamed CDW Corporation (“Parent”).
	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. On August 6, 2010, CDW Finance Corporation, a Delaware corporation, was formed for the sole purpose of acting as co-issuer of certain debt obligations as described in Note 17 and does not hold any material assets or engage in any business activities or operations.
	Throughout this report, the terms “the Company” and “CDW” refer to Parent and its 100% owned subsidiaries.
	Parent was previously owned directly by CDW Holdings LLC ("CDW Holdings"), a company controlled by investment funds affiliated with Madison Dearborn Partners, LLC ("Madison Dearborn") and Providence Equity Partners L.L.C. ("Providence Equity," and together with Madison Dearborn, the "Sponsors"), certain other co-investors and certain members of CDW management. On July 2, 2013, Parent completed an initial public offering ("IPO") of its common stock. In connection with the IPO, CDW Holdings distributed all of its shares of Parent's common stock to its members in June 2013 in accordance with the members’ respective membership interests and was subsequently dissolved in August 2013. See Note 9 for additional discussion of the IPO.
	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 at 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.
	Reclassifications
	Certain reclassifications have been made to the prior period consolidated financial statements to conform to the current period presentation.
	Cash and Cash Equivalents
	Cash and cash equivalents include all deposits in banks and short-term (original maturities of three months or less), highly liquid investments that are readily convertible to known amounts of cash and are so near maturity that there is insignificant risk of changes in value due to interest rate changes.
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and typically do not bear interest. The Company provides allowances for doubtful accounts related to accounts receivable for estimated losses resulting from the inability of its customers to make required payments. The Company takes into consideration the overall quality of the receivable portfolio along with specifically-identified customer risks.
	Merchandise Inventory
	Inventory is valued at the lower of cost or market value. Cost is determined using a weighted-average cost method. Price protection is recorded when earned as a reduction to the cost of inventory. The Company decreases the value of inventory for estimated obsolescence equal to the difference between the cost of inventory and the estimated market value, based upon an aging analysis of the inventory on hand, specifically known inventory-related risks, and assumptions about future demand and market conditions.
	Miscellaneous Receivables
	Miscellaneous receivables generally consist of amounts due from vendors. The Company receives incentives from vendors related to cooperative advertising allowances, volume rebates, bid programs, price protection and other programs. These incentives generally relate to written vendor agreements with specified performance requirements and are recorded as adjustments to cost of sales or inventory, depending on the nature of the incentive.
	Property and Equipment
	Property and equipment are stated at cost. The Company calculates depreciation expense using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of their useful lives or the initial lease term. Expenditures for major renewals and improvements that extend the useful life of property and equipment are capitalized. Expenditures for maintenance and repairs are charged to expense as incurred. The following table shows estimated useful lives of property and equipment:
	Classification	Estimated
		Useful Lives
	Machinery and equipment	5 to 10 years
	Building and leasehold improvements	5 to 25 years
	Computer and data processing equipment	3 to 5 years
	Computer software	3 to 5 years
	Furniture and fixtures	5 to 10 years
	The Company has asset retirement obligations associated with commitments to return property subject to operating leases to its original condition upon lease termination. The Company’s asset retirement liability was $0.5 million as of December 31, 2013 and 2012.
	Goodwill and Other Intangible Assets
	The Company is required to perform an evaluation of goodwill on an annual basis or more frequently if circumstances indicate a potential impairment. The annual test for impairment is conducted as of December 1. The Company’s reporting units used to assess potential goodwill impairment are the same as its operating segments. The Company has the option of performing a qualitative assessment of a reporting unit's fair value from the last quantitative assessment to determine if it is more likely than not that the reporting unit's goodwill is impaired or performing a quantitative assessment by comparing a reporting unit's estimated fair value to its carrying amount. Under the quantitative assessment, testing for impairment of goodwill is a two-step process. The first step compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, the second step compares the implied fair value of reporting unit goodwill with the carrying amount of that goodwill to determine the amount of impairment loss. Fair value of a reporting unit is determined by using a weighted combination of an income approach and a market approach, as this combination is considered the most indicative of the Company’s fair value in an orderly transaction between market participants. This assessment uses significant accounting judgments, estimates and assumptions. Any changes in the judgments, estimates or assumptions used could produce significantly different results. During the years ended December 31, 2013, 2012 and 2011, the Company recorded no goodwill impairment charges. See Note 4 for more information on the Company’s evaluations of goodwill for impairment.
	Intangible assets with determinable lives are amortized on a straight-line basis over their respective estimated useful lives. The cost of computer software developed or obtained for internal use is capitalized and amortized on a straight-line basis over the estimated useful life of the software. These intangible assets are reviewed for impairment when indicators are present using undiscounted cash flows. The Company uses the undiscounted cash flows, excluding interest charges, to assess the recoverability of the carrying value of such assets. To the extent carrying value exceeds the undiscounted cash flows, an impairment loss is recorded based upon the excess of the carrying value over fair value. In addition, each quarter, the Company evaluates whether events and circumstances warrant a revision to the remaining estimated useful life of each of these intangible assets. If the Company were to determine that a change to the remaining estimated useful life of an intangible asset was necessary, then the remaining carrying amount of the intangible asset would be amortized prospectively over that revised remaining useful life. During the years ended December 31, 2013, 2012 and 2011, no impairment existed with respect to the Company’s intangible assets with determinable lives and no significant changes to the remaining useful lives were necessary. The following table shows estimated useful lives of definite-lived intangible assets:
	Classification	Estimated
		Useful Lives
	Customer relationships	11 to 14 years
	Trade name	20 years
	Internally developed software	3 to 5 years
	Other	1 to 10 years
	Deferred Financing Costs
	Deferred financing costs, such as underwriting, financial advisory, professional fees and other similar fees are capitalized and recognized in interest expense over the estimated life of the related debt instrument using the effective interest method or straight-line method, as applicable.
	Derivatives
	The Company has entered into interest rate cap agreements for the purpose of economically hedging its exposure to fluctuations in interest rates. These derivatives are recorded at fair value in the Company’s consolidated balance sheets.
	The Company’s interest rate cap agreements are not designated as cash flow hedges of interest rate risk. Changes in fair value of the derivatives are recorded directly to interest expense, net in the Company’s consolidated statements of operations.
	Fair Value Measurements
	Fair value is defined under GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy has been established for valuation inputs to prioritize the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels which is determined by the lowest level input that is significant to the fair value measurement in its entirety. These levels are:
	Level 1 – observable inputs such as quoted prices for identical instruments traded in active markets.
	Level 2 – inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar techniques.
	Accumulated Other Comprehensive (Loss) Income
	Foreign currency translation adjustments are included in shareholders’ equity under accumulated other comprehensive (loss) income.
	The components of accumulated other comprehensive (loss) income are as follows:
	(in millions)	December 31,
		2013			2012		2011
	Foreign currency translation adjustment	$	(6.3	)	$	0.4	$	(2.1	)
	Accumulated other comprehensive (loss) income	$	(6.3	)	$	0.4	$	(2.1	)
	Revenue Recognition
	The Company is a primary distribution channel for a large group of vendors and suppliers, including original equipment manufacturers (“OEMs”), software publishers and wholesale distributors. The Company records revenue from sales transactions when title and risk of loss are passed to the customer, there is persuasive evidence of an arrangement for sale, delivery has occurred and/or services have been rendered, the sales price is fixed or determinable, and collectability is reasonably assured. The Company's shipping terms typically specify F.O.B. destination, at which time title and risk of loss have passed to the customer.
	Revenues from the sales of hardware products and software products and licenses are generally recognized on a gross basis with the selling price to the customer recorded as sales and the acquisition cost of the product recorded as cost of sales. These items can be delivered to customers in a variety of ways, including (i) as physical product shipped from the Company's warehouse, (ii) via drop-shipment by the vendor or supplier, or (iii) via electronic delivery for software licenses. At the time of sale, the Company records an estimate for sales returns and allowances based on historical experience. The Company's vendor partners warrant most of the products the Company sells.
The Company leverages drop-shipment arrangements with many of its vendors and suppliers to deliver products to its customers without having to physically hold the inventory at its warehouses, thereby increasing efficiency and reducing costs. The Company recognizes revenue for drop-shipment arrangements on a gross basis upon delivery to the customer with contract terms that typically specify F.O.B. destination.
Revenue from professional services is either recognized as provided for services billed at an hourly rate or recognized using a proportional performance model for services provided at a fixed fee. Revenue from cloud computing solutions including Software as a Service ("SaaS") and Infrastructure as a Service ("IaaS") arrangements, as well as data center services such as managed and remote managed services, server co-location, internet connectivity and data backup and storage, is recognized over the period service is provided.
The Company also sells certain products for which it acts as an agent. Products in this category include the sale of third-party services, warranties, software assurance (“SA”) and third-party hosted SaaS and IaaS arrangements. SA is a product that allows customers to upgrade, at no additional cost, to the latest technology if new applications are introduced during the period that the SA is in effect. These sales do not meet the criteria for gross sales recognition, and thus are recognized on a net basis at the time of sale. Under net sales recognition, the cost paid to the vendor or third-party service provider is recorded as a reduction to sales, resulting in net sales being equal to the gross profit on the transaction.
The Company's larger customers are offered the opportunity by certain of its vendors to purchase software licenses and SA under enterprise agreements (“EAs”). Under EAs, customers are considered to be compliant with applicable license requirements for the ensuing year, regardless of changes to their employee base. Customers are charged an annual true-up fee for changes in the number of users over the year. With most EAs, the Company's vendors will transfer the license and bill the customer directly, paying resellers such as the Company an agency fee or commission on these sales. The Company records these fees as a component of net sales as earned and there is no corresponding cost of sales amount. In certain instances, the Company bills the customer directly under an EA and accounts for the individual items sold based on the nature of the item. The Company's vendors typically dictate how the EA will be sold to the customer.
From time to time, the Company sells some of its products and services as part of bundled contract arrangements containing multiple deliverables, which may include a combination of products and services. For each deliverable that represents a separate unit of accounting, total arrangement consideration is allocated based upon the relative selling prices of each element. The allocated arrangement consideration is recognized as revenue in accordance with the principles described above. Selling prices are determined by using vendor specific objective evidence (“VSOE”) if it exists. Otherwise, selling prices are determined using third party evidence (“TPE”). If neither VSOE or TPE is available, the Company uses its best estimate of selling prices.
The Company records freight billed to its customers as net sales and the related freight costs as a cost of sales.
Deferred revenue includes (1) payments received from customers in advance of providing the product or performing services, and (2) amounts deferred if other conditions of revenue recognition have not been met.
The Company performs an analysis of the estimated number of days of sales in-transit to customers at the end of each period based on a weighted-average analysis of commercial delivery terms that includes drop-shipment arrangements. This analysis is the basis upon which the Company estimates the amount of sales in-transit at the end of the period and adjusts revenue and the related costs to reflect only what has been received by the customer. Changes in delivery patterns may result in a different number of business days used in making this adjustment and could have a material impact on the Company's revenue recognition for the period.
Sales Taxes
Sales tax amounts collected from customers for remittance to governmental authorities are presented on a net basis in the Company’s consolidated statements of operations.
Advertising
Advertising costs are generally charged to expense in the period incurred. Cooperative reimbursements from vendors are recorded in the period the related advertising expenditure is incurred. The Company classifies vendor consideration as a reduction to cost of sales.
Equity-Based Compensation
The Company measures all equity-based payments using a fair-value-based method and records compensation expense over the requisite service period in its consolidated financial statements. Forfeiture rates have been developed based upon historical experience.
Interest Expense
Interest expense is typically recognized in the period incurred at the applicable interest rate in effect. For increasing-rate debt, the Company determines the periodic interest cost using the effective interest method over the estimated outstanding term of the debt. The difference between interest expense recorded and cash interest paid is reflected as short-term or long-term accrued interest in the Company’s consolidated balance sheets.
Foreign Currency Translation
The Company’s functional currency is the U.S. dollar. The functional currency of the Company’s Canadian subsidiary is the local currency, the Canadian dollar. Assets and liabilities of this subsidiary are translated at the spot rate in effect at the applicable reporting date and the consolidated results of operations are translated at the average exchange rates in effect during the applicable period. The resulting foreign currency translation adjustment is recorded as accumulated other comprehensive (loss) income, which is reflected as a separate component of shareholders’ equity.
Income Taxes
Deferred income taxes are provided to reflect the differences between the tax bases of assets and liabilities and their reported amounts in the consolidated financial statements using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company performs an evaluation of the realizability of deferred tax assets on a quarterly basis. This evaluation requires management to make use of estimates and assumptions and considers all positive and negative evidence and factors, such as the scheduled reversal of temporary differences, the mix of earnings in the jurisdictions in which the Company operates, and prudent and feasible tax planning strategies.
The Company accounts for unrecognized tax benefits based upon its assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. The Company reports a liability for unrecognized tax benefits resulting from unrecognized tax benefits taken or expected to be taken in a tax return and recognizes interest and penalties, if any, related to its unrecognized tax benefits in income tax expense.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
	Dec. 31, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	Disclosure of the Effects of Reclassifications from Accumulated Other Comprehensive Income
	In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update 2013-02, which required that the effects of significant reclassifications from accumulated other comprehensive income to net income be shown parenthetically on the face of the consolidated financial statements or disclosed in a note. The adoption of this new guidance on January 1, 2013 did not have an impact on the Company's consolidated financial position, results of operations or cash flows.

Property_And_Equipment

Property And Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property And Equipment	'
	Property and Equipment
	Property and equipment consisted of the following:
	(in millions)	December 31,
		2013		2012
	Land	$	27.7	$	27.7
	Machinery and equipment	53		50.9
	Building and leasehold improvements	104.8		104
	Computer and data processing equipment	61.2		56.4
	Computer software	30.9		30.2
	Furniture and fixtures	21.6		21.6
	Construction in progress	10.9		11.9
	Total property and equipment	310.1		302.7
	Less accumulated depreciation	179		160
	Net property and equipment	$	131.1	$	142.7
	During 2013, 2012 and 2011, the Company recorded disposals of $7.9 million, $12.2 million and $10.5 million, respectively, to remove assets that were no longer in use from property and equipment. The Company recorded a pre-tax loss of $0.0 million, $0.1 million and $0.3 million in 2013, 2012 and 2011, respectively, for certain disposed assets that were not fully depreciated.
	Depreciation expense for the years ended December 31, 2013, 2012 and 2011 was $27.2 million, $32.0 million and $31.3 million, respectively.

Goodwill_And_Other_Intangible_

Goodwill And Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill And Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	As described in Note 1, the Company is required to perform an evaluation of goodwill on an annual basis or more frequently if circumstances indicate a potential impairment. The annual test for impairment is conducted as of December 1. The Company’s reporting units used to assess potential goodwill impairment are the same as its operating segments. The Company has two reportable segments: Corporate, which is comprised primarily of business customers, and Public, which is comprised of government entities and education and healthcare institutions. The Company also has two other operating segments, CDW Advanced Services and Canada, which do not meet the reportable segment quantitative thresholds and, accordingly, are combined together as “Other” for segment reporting purposes. The Company has the option of performing a qualitative assessment of a reporting unit's fair value from the last quantitative assessment to determine if it is more likely than not that the reporting unit's goodwill is impaired or performing a quantitative assessment by comparing a reporting unit's estimated fair value to its carrying amount. Under the quantitative assessment, testing for impairment of goodwill is a two-step process. The first step compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, the second step compares the implied fair value of reporting unit goodwill with the carrying amount of that goodwill to determine the amount of impairment loss. Fair value of a reporting unit is determined by using a weighted combination of an income approach and a market approach, as this combination is considered the most indicative of the Company’s fair value in an orderly transaction between market participants. Under the income approach, the Company determined fair value based on estimated future cash flows of a reporting unit, discounted by an estimated weighted-average cost of capital, which reflects the overall level of inherent risk of a reporting unit and the rate of return an outside investor would expect to earn. Under the market approach, the Company utilized valuation multiples derived from publicly available information for guideline companies to provide an indication of how much a knowledgeable investor in the marketplace would be willing to pay for a company. The valuation multiples were applied to the reporting units. Determining the fair value of a reporting unit is judgmental in nature and requires the use of significant estimates and assumptions, including revenue growth rates, gross margins, operating margins, discount rates and future market conditions, among others.
	December 1, 2013 Evaluation
	The Company performed its annual evaluation of goodwill as of December 1, 2013 by utilizing a quantitative assessment for all reporting units. All reporting units passed the first step of the goodwill evaluation (with the fair value exceeding the carrying value by 107%, 82%, 167% and 168% for the Corporate, Public, Canada and CDW Advanced Services reporting units, respectively) and, accordingly, the Company was not required to perform the second step of the goodwill evaluation.
	To determine the fair value of the reporting units, the Company used a 75%/25% weighting of the income approach and market approach, respectively. Under the income approach, the Company estimated future cash flows of each reporting unit based on internally generated forecasts for the remainder of 2013 and the next six years. The Company used a 3.5% long-term assumed consolidated annual revenue growth rate for periods after the six-year forecast. The estimated future cash flows for the Corporate and Public reporting units were discounted at 10.0%; cash flows for the Canada and CDW Advanced Services reporting units were discounted at 10.3% and 10.5%, respectively, based on the future growth rates assumed in the discounted cash flows. Discount rates utilized during the 2013 goodwill evaluation declined compared to those used in 2012 as a result of the market performance of the Company's common stock and a lower equity risk premium.
	December 1, 2012 Evaluation
	The Company performed its annual evaluation of goodwill as of December 1, 2012 by utilizing a quantitative assessment for all reporting units. All reporting units passed the first step of the goodwill evaluation (with the fair value exceeding the carrying value by 49%, 44%, 104% and 17% for the Corporate, Public, Canada and CDW Advanced Services reporting units, respectively) and, accordingly, the Company was not required to perform the second step of the goodwill evaluation.
	To determine the fair value of the reporting units, the Company used a 75%/25% weighting of the income approach and market approach, respectively. Under the income approach, the Company estimated future cash flows of each reporting unit based on internally generated forecasts for the remainder of 2012 and the next six years. The Company used a 3.5% long-term assumed consolidated annual revenue growth rate for periods after the six-year forecast. The estimated future cash flows for the Corporate and Public reporting units were discounted at 11.5%; cash flows for the Canada and CDW Advanced Services reporting units were discounted at 11.8% and 12.0%, respectively, based on the future growth rates assumed in the discounted cash flows.
	December 1, 2011 Evaluation
	The Company performed its annual evaluation of goodwill as of December 1, 2011 by utilizing a quantitative assessment for all reporting units. All reporting units passed the first step of the goodwill evaluation (with the fair value exceeding the carrying value by 43%, 27%, 159% and 17%, for the Corporate, Public, Canada and CDW Advanced Services reporting units, respectively) and, accordingly, the Company was not required to perform the second step of the goodwill evaluation.
	To determine the fair value of the reporting units, the Company used a 75%/25% weighting of the income approach and market approach, respectively. Under the income approach, the Company estimated future cash flows of each reporting unit based on internally generated forecasts for the remainder of 2011 and the next six years. The Company used a 3.5% long-term assumed consolidated annual revenue growth rate for periods after the six-year forecast. The estimated future cash flows for the Corporate, Public and CDW Advanced Services reporting units were discounted at 11.5%; cash flows for the Canada reporting unit were discounted at 12.0% given inherent differences in the business model and risk profile.
	The following table presents the change in goodwill by segment for the years ended December 31, 2013 and 2012:
	(in millions)	Corporate			Public			Other (1)			Consolidated
	Balances as of December 31, 2011:
	Goodwill	$	2,794.40		$	1,261.40		$	106.4		$	4,162.20
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,223.00		$	907.3		$	78.1		$	2,208.40
	2012 Activity:
	Translation adjustment	$	—		$	—		$	0.9		$	0.9
		$	—		$	—		$	0.9		$	0.9
	Balances as of December 31, 2012:
	Goodwill	$	2,794.40		$	1,261.40		$	107.3		$	4,163.10
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,223.00		$	907.3		$	79		$	2,209.30
	2013 Activity:
	Translation adjustment	$	—		$	—		$	(2.1	)	$	(2.1	)
	Contingent consideration (2)	8.8			4			0.3			13.1
		$	8.8		$	4		$	(1.8	)	$	11
	Balances as of December 31, 2013:
	Goodwill	$	2,803.20		$	1,265.40		$	105.5		$	4,174.10
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,231.80		$	911.3		$	77.2		$	2,220.30
	(1)Other is comprised of CDW Advanced Services and Canada reporting units.
	-2	During 2013, the Company recorded a $13.1 million net-of-tax addition to goodwill in connection with the settlement of the MPK Coworker Incentive Plan II and related charitable contribution. The charitable contribution was accounted for as additional purchase price (goodwill) in accordance with pre-2009 business combinations accounting guidance. See Note 10 for additional discussion of this transaction.
	The following table presents a summary of intangible assets at December 31, 2013 and 2012:
	(in millions)
	December 31, 2013	Gross			Accumulated			Net Carrying Amount
		Carrying			Amortization
		Amount
	Customer relationships	$	1,860.80		$	872.8		$	988
	Trade name	421			130.9			290.1
	Internally developed software	128.5			79.8			48.7
	Other	3.1			1.9			1.2
	Total	$	2,413.40		$	1,085.40		$	1,328.00
	December 31, 2012
	Customer relationships	$	1,861.70		$	733.3		$	1,128.40
	Trade name	421			109.9			311.1
	Internally developed software	97.4			60.1			37.3
	Other	3.3			1.6			1.7
	Total	$	2,383.40		$	904.9		$	1,478.50
	Amortization expense related to intangible assets for the years ended December 31, 2013, 2012 and 2011 was $181.0 million, $178.2 million and $173.5 million, respectively.
	Estimated future amortization expense related to intangible assets for the next five years is as follows:
	(in millions)
	Years ending December 31,
	2014	$	179
	2015	171.7
	2016	163.9
	2017	161.5
	2018	161.3

Inventory_Financing_Agreements

Inventory Financing Agreements	12 Months Ended
	Dec. 31, 2013
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, as described below. These amounts are classified separately as accounts payable-inventory financing on the accompanying consolidated balance sheets. The Company does not incur any interest expense associated with these agreements as balances are paid when they are due.
	The following table presents the amounts included in accounts payable-inventory financing:
	(in millions)	December 31,
		2013		2012
	Revolving Loan inventory financing agreement	$	256.1	$	248.3
	Other inventory financing agreements	0.5		0.9
	Accounts payable-inventory financing	$	256.6	$	249.2
	The Company maintains a senior secured asset-based revolving credit facility as described in Note 7, which incorporates a $400.0 million floorplan sub-facility to facilitate the purchase of inventory from a certain vendor. In connection with the floorplan sub-facility, the Company maintains an inventory financing agreement on an unsecured basis with a financial intermediary to facilitate the purchase of inventory from this vendor (the “Revolving Loan inventory financing agreement”). Amounts outstanding under the Revolving Loan inventory financing agreement are unsecured and non-interest bearing. At December 31, 2013 and 2012, the Company reported $256.1 million and $248.3 million, respectively, for this agreement within accounts payable-inventory financing on the consolidated balance sheets.
	The Company also maintains other inventory financing agreements with financial intermediaries to facilitate the purchase of inventory from certain vendors. At December 31, 2013 and 2012, amounts owed under other inventory financing agreements of $0.5 million and $0.9 million, respectively, were collateralized by the inventory purchased under these financing agreements and a second lien on the related accounts receivable.

Lease_Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Lease Commitments [Text Block]	'
	Lease Commitments
	The Company is obligated under various non-cancelable operating lease agreements for office facilities that generally provide for minimum rent payments and a proportionate share of operating expenses and property taxes and include certain renewal and expansion options. For the years ended December 31, 2013, 2012 and 2011, rent expense under these lease arrangements was $20.7 million, $22.4 million and $21.6 million, respectively.
	Future minimum lease payments are as follows:
	(in millions)
	Years ending December 31,
	2014	$	17.9
	2015	17.7
	2016	13.2
	2017	10.7
	2018	9
	Thereafter	20.7
	Total future minimum lease payments	$	89.2

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Long-Term Debt
	Long-term debt was as follows:
	(dollars in millions)				December 31,
		Interest Rate (1)			2013				2012
	Senior secured asset-based revolving credit facility	—	%		$	—			$	—
	Senior secured term loan facility	3.25	%		1,528.90				1,339.50
	Unamortized discount on senior secured term loan facility				(4.4		)		—
	Senior secured notes due 2018	8	%		325				500
	Senior notes due 2019	8.5	%		1,305.00				1,305.00
	Unamortized premium on senior notes due 2019				4.2				5
	Senior subordinated notes due 2017	12.535	%		92.5				621.5
	Total long-term debt				3,251.20				3,771.00
	Less current maturities of long-term debt				(45.4		)		(40.0		)
	Long-term debt, excluding current maturities				$	3,205.80			$	3,731.00
	(1)Interest rate at December 31, 2013.
	At December 31, 2013, the Company was in compliance with the covenants under its various credit agreements and indentures as described below. Under the indentures governing the 8.5% Senior Notes due 2019 and 8.0% Senior Secured Notes due 2018, which contain the most restrictive restricted payment provisions in the Company’s various credit agreements and indentures, CDW LLC and its restricted subsidiaries are generally restricted from paying dividends and making other restricted payments unless CDW LLC could incur an additional dollar of indebtedness under its fixed charges ratio covenant and the amount of such dividend or other restricted payment, together with the amount of all other dividends and restricted payments made from January 1, 2011 through the end of the most recently ended fiscal quarter, is less than the sum of 50% of cumulative consolidated net income or 100% of any consolidated net loss incurred over the period plus the amount of certain other items occurring during that period that increase (and in some cases decrease) the amounts available for such payments. For the purpose of determining restricted payment capacity, consolidated net income or loss includes certain adjustments that are defined in the indentures. At December 31, 2013, the amount of cumulative consolidated net income free of restrictions under the credit agreements and indentures ("Restricted Payment Capacity") was $148.0 million. However, the subsequent events transactions described in Note 19 have since reduced the Restricted Payment Capacity to approximately $89 million.
	Senior Secured Asset-Based Revolving Credit Facility (“Revolving Loan”)
	At December 31, 2013, the Company had no outstanding borrowings under the Revolving Loan, $2.2 million of undrawn letters of credit and $256.7 million reserved related to the floorplan sub-facility.
	On June 24, 2011, the Company entered into the Revolving Loan, a five-year $900.0 million senior secured asset-based revolving credit facility, with the facility being available to the Company for borrowings, issuance of letters of credit and floorplan financing for certain vendor products. The Revolving Loan matures on June 24, 2016. The Revolving Loan replaced the Company's previous revolving loan credit facility that was to mature on October 12, 2012. In connection with the termination of the previous facility, the Company recorded a loss on extinguishment of long-term debt of $1.6 million in the Company's consolidated statement of operations for the year ended December 31, 2011, representing a write-off of a portion of unamortized deferred financing costs. Fees of $7.2 million related to the Revolving Loan were capitalized as deferred financing costs and are being amortized over the term of the facility on a straight-line basis.
	As described in Note 5, the Company has entered into agreements with certain financial intermediaries to facilitate the purchase of inventory from various suppliers. In connection with the floorplan sub-facility, the Company entered into the Revolving Loan inventory financing agreement. Amounts outstanding under the Revolving Loan inventory financing agreement are unsecured and noninterest bearing. The Company will either pay the outstanding Revolving Loan inventory financing agreement amounts when they become due, or the Revolving Loan's administrative agent will automatically initiate an advance on the Revolving Loan and use the proceeds to pay the balance on the due date. At December 31, 2013, the financial intermediary reported an outstanding balance of $246.8 million under the Revolving Loan inventory financing agreement. The total amount reported on the Company's consolidated balance sheet as accounts payable-inventory financing related to the Revolving Loan inventory financing agreement is $9.3 million more than the $246.8 million owed to the financial intermediary due to differences in the timing of reporting activity under the Revolving Loan inventory financing agreement. The outstanding balance reported by the financial intermediary excludes $9.9 million in reserves for open orders that reduce the availability under the Revolving Loan. Changes in cash flows from the Revolving Loan inventory financing agreement are reported in financing activities on the Company's consolidated statements of cash flows.
	Borrowings under the Revolving Loan bear interest at a variable interest rate plus an applicable margin. The variable interest rate is based on one of two indices, either (i) LIBOR, or (ii) the Alternate Base Rate (“ABR”) with the ABR being the greatest of (a) the prime rate, (b) the federal funds effective rate plus 50 basis points or (c) the one-month LIBOR plus 1.00%. The applicable margin varies (2.00% to 2.50% for LIBOR borrowings and 1.00% to 1.50% for ABR borrowings) depending upon the Company's average daily excess cash availability under the agreement and is subject to a reduction of 0.25% if, and for as long as, the senior secured leverage ratio is less than 3.0. The senior secured leverage ratio is defined as the ratio of senior secured debt (including amounts owed under certain inventory floorplan arrangements) less cash and cash equivalents, to Adjusted EBITDA, a non-GAAP measure, for the four most recently ended fiscal quarters. For the four quarters ended December 31, 2013, the senior secured leverage ratio was 2.1.
	Availability under the Revolving Loan is limited to (a) the lesser of the revolving commitment of $900.0 million and the amount of the borrowing base less (b) outstanding borrowings, letters of credit, and amounts outstanding under the Revolving Loan inventory financing agreement plus a reserve of 15% of open orders. The borrowing base is (a) the sum of the products of the applicable advance rates on eligible accounts receivable and on eligible inventory as defined in the agreement less (b) any reserves. At December 31, 2013, the borrowing base was $1,065.5 million based on the amount of eligible inventory and accounts receivable balances as of November 30, 2013. The Company could have borrowed up to an additional $641.1 million under the Revolving Loan at December 31, 2013. The fee on the unused portion of the Revolving Loan ranges from 25 basis points to either 37.5 or 50 basis points, depending on the amount of utilization.
	CDW LLC is the borrower under the Revolving Loan. All obligations under the Revolving Loan are guaranteed by Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries. Borrowings under the Revolving Loan are collateralized by a first priority interest in inventory (excluding inventory collateralized under the inventory floorplan arrangements as described in Note 5), deposits, and accounts receivable, and a second priority interest in substantially all other assets. The Revolving Loan contains negative covenants that, among other things, place restrictions and limitations on the ability of Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries to dispose of assets, incur additional indebtedness, incur guarantee obligations, prepay other indebtedness, make distributions or other restricted payments, create liens, make equity or debt investments, make acquisitions, engage in mergers or consolidations, or engage in certain transactions with affiliates. The Revolving Loan also includes maintenance of a minimum average daily excess cash availability requirement. Should the Company fall below the minimum average daily excess cash availability requirement for five consecutive business days, the Company becomes subject to a fixed charge coverage ratio until such time as the daily excess cash availability requirement is met for 30 consecutive business days.
	Senior Secured Term Loan Facility
	On April 29, 2013, the Company entered into a new seven-year, $1,350.0 million aggregate principal amount senior secured term loan facility (the "Term Loan"). The Term Loan was issued at a price that was 99.75% of par, which resulted in a discount of $3.4 million. Substantially all of the proceeds from the Term Loan were used to repay the $1,299.5 million outstanding aggregate principal amount of the prior senior secured term loan facility (the "Prior Term Loan Facility"). In connection with this refinancing, the Company recorded a loss on extinguishment of long-term debt of $10.3 million in the consolidated statement of operations for the year ended December 31, 2013. This loss represented a write-off of the remaining unamortized deferred financing costs related to the Prior Term Loan Facility.
	On July 31, 2013, the Company borrowed an additional $190.0 million aggregate principal amount under the Term Loan at a price that was 99.25% of par, which resulted in a discount of $1.4 million. Such proceeds were used to redeem a portion of outstanding Senior Subordinated Notes. The discounts are reported on the consolidated balance sheet as a reduction to the face amount of the Term Loan and are being amortized to interest expense over the term of the related debt. Fees of $6.1 million related to the Term Loan were capitalized as deferred financing costs and are being amortized over the term of the facility using the effective interest method.
	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 1.00% per annum at any time ("LIBOR Floor"). The margin is based upon a net leverage ratio as defined in the agreement governing the Term Loan, ranging from 1.25% to 1.50% for ABR borrowings and 2.25% to 2.50% for LIBOR borrowings. An interest rate of 3.25%, LIBOR Floor plus a 2.25% margin, was in effect during the three-month period ended December 31, 2013.
	Unlike the Prior Term Loan Facility, the Term Loan does not include a senior secured leverage ratio requirement or a hedging requirement. Additionally, the definition of debt under the Term Loan was revised to exclude amounts outstanding under the Company's inventory financing agreements. The Term Loan is subject to certain requirements as was the Prior Term Loan Facility to make mandatory annual excess cash flow prepayments under designated circumstances, including (i) a prepayment in an amount equal to 50% of the Company's excess cash flow for a fiscal year (the percentage rate of which decreases to 25% when the total net leverage ratio, as defined in the governing agreement, is less than or equal to 5.5 but greater than 4.5; and decreases to 0% when the total net leverage ratio is less than or equal to 4.5), and (ii) the net cash proceeds from the incurrence of certain additional indebtedness by the Company or its subsidiaries. The total net leverage ratio was 3.8 at December 31, 2013.
	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 April 29, 2020. The quarterly principal installment payments commenced during the quarter ended June 30, 2013. At December 31, 2013, the outstanding principal amount of the Term Loan was $1,528.9 million, excluding $4.4 million in unamortized discount.
	The Company has interest rate cap agreements in effect through January 14, 2015 with a combined notional amount of $1,150.0 million. These cap agreements have not been designated as cash flow hedges of interest rate risk for GAAP accounting purposes. Of the total $1,150.0 million notional amount, $500.0 million entitle the Company to payments from the counterparty of the amount, if any, by which three-month LIBOR exceeds 3.5% during the agreement period. The remaining cap agreements with a notional amount of $650.0 million entitle the Company to payments from the counterparty of the amount, if any, by which the three-month LIBOR exceeds 1.5% during the agreement period. The fair value of the Company's interest rate cap agreements was zero at December 31, 2013 and $0.1 million at December 31, 2012.
	During the first quarters of 2013, 2012 and 2011, the Company made principal prepayments totaling $40.0 million, $201.0 million and $132.0 million, respectively, under the Prior Term Loan Facility. These prepayments satisfied the excess cash flow payment provision of the Prior Term Loan Facility with respect to the years ended December 31, 2012, 2011 and 2010, respectively.
	On March 11, 2011, the Company entered into an amendment to the Prior Term Loan Facility, which became effective on March 14, 2011. In connection with this amendment, the Company recorded a loss on extinguishment of long-term debt of $3.2 million in the Company's consolidated statement of operations for the year ended December 31, 2011. This loss represented a write-off of a portion of the unamortized deferred financing costs related to the Prior Term Loan Facility.
	CDW LLC is the borrower under the Term Loan. All obligations under the Term Loan are guaranteed by Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries. The Term Loan is collateralized by a second priority interest in substantially all inventory (excluding inventory collateralized under the inventory floorplan arrangements as described in Note 5), deposits, and accounts receivable, and by a first priority interest in substantially all other assets. The Term Loan contains negative covenants that, among other things, place restrictions and limitations on the ability of Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries to dispose of assets, incur additional indebtedness, incur guarantee obligations, prepay other indebtedness, make distributions or other restricted payments, create liens, make equity or debt investments, make acquisitions, engage in mergers or consolidations, or engage in certain transactions with affiliates.
	8.0% Senior Secured Notes due 2018 (“Senior Secured Notes”)
	The Senior Secured Notes were issued on December 17, 2010 and will mature on December 15, 2018. At December 31, 2013, the outstanding principal amount of the Senior Secured Notes was $325.0 million.
	On July 2, 2013, the Company used a portion of the net proceeds from the IPO to redeem $175.0 million aggregate principal amount of Senior Secured Notes. The redemption price of the Senior Secured Notes was 108.0% of the principal amount redeemed, plus $0.7 million of accrued and unpaid interest to the date of redemption. The Company used cash on hand to pay such accrued and unpaid interest. In connection with this redemption, the Company recorded a loss on extinguishment of long-term debt of $16.7 million in the consolidated statement of operations for the year ended December 31, 2013. This loss represented $14.0 million in redemption premium and $2.7 million for the write-off of a portion of the remaining deferred financing costs related to the Senior Secured Notes.
	CDW LLC and CDW Finance Corporation are the co-issuers of the Senior Secured Notes and the obligations under the notes are guaranteed by Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries. The Senior Secured Notes are secured on a pari passu basis with the Term Loan by a second priority interest in substantially all inventory (excluding inventory collateralized under the inventory floorplan arrangements as described in Note 5), deposits, and accounts receivable, and by a first priority interest in substantially all other assets. The Senior Secured Note indenture contains negative covenants that, among other things, place restrictions and limitations on the ability of Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries to dispose of assets, incur additional indebtedness, incur guarantee obligations, prepay other indebtedness, make distributions or other restricted payments, create liens, make equity or debt investments, make acquisitions, engage in mergers or consolidations, or engage in certain transactions with affiliates. The Senior Secured Note indenture does not contain any financial covenants.
	11.0% Senior Exchange Notes due 2015 (“Senior Exchange Notes”); 11.5% / 12.25% Senior PIK Election Exchange Notes due 2015 (“PIK Election Notes” together with the Senior Exchange Notes, the “Senior Notes due 2015”)
	At December 31, 2013, there were no outstanding Senior Notes due 2015.
	On April 13, 2011, the Company completed a cash tender offer (the “Initial Senior Notes due 2015 Tender Offer”) and purchased $665.1 million aggregate principal amount of Senior Notes due 2015 comprised of $519.2 million of the Senior Exchange Notes and $145.9 million of the PIK Election Notes. The Company concurrently issued $725.0 million aggregate principal amount of Senior Notes (as defined below). The proceeds from this offering, together with cash on hand and borrowings under the then-outstanding revolving loan credit facility, were used to fund the purchase of the tendered Senior Notes due 2015, including $665.1 million aggregate principal amount of Senior Notes due 2015, $59.9 million in tender offer premium and $36.5 million of accrued and unpaid interest, along with transaction fees and expenses.
	On May 20, 2011, the Company completed a follow-on cash tender offer (the “Follow-on Senior Notes due 2015 Tender Offer,” and together with the Initial Senior Notes due 2015 Tender Offer, the “Senior Notes due 2015 Tender Offers”) and purchased an additional $412.8 million aggregate principal amount of Senior Notes due 2015 comprised of $321.4 million of the Senior Exchange Notes and $91.4 million of the PIK Election Notes. The Company concurrently issued $450.0 million in aggregate principal amount of additional Senior Notes. The proceeds from this offering, together with cash on hand and borrowings under the then-outstanding revolving loan credit facility, were used to fund the purchase of the tendered Senior Notes due 2015, including $412.8 million aggregate principal amount of Senior Notes due 2015, $37.2 million in tender offer premium and $4.5 million of accrued and unpaid interest, along with transaction fees and expenses.
	In connection with the Senior Notes due 2015 Tender Offers, the Company recorded a loss on extinguishment of long-term debt of $114.1 million in the Company's consolidated statement of operations for the year ended December 31, 2011. This loss represented $97.0 million in tender offer premiums and $17.1 million for the write-off of a portion of the unamortized deferred financing costs related to the Senior Notes due 2015. In connection with the issuance of Senior Notes, fees of $19.1 million were capitalized as deferred financing costs and are being amortized over the term of the notes using the effective interest method.
	On February 2, 2012, the Company commenced a tender offer to purchase any and all of the remaining $129.0 million aggregate principal amount of Senior Notes due 2015. On February 17, 2012, the Company accepted for purchase $120.6 million aggregate principal amount of the outstanding Senior Notes due 2015 that were tendered. On March 5, 2012, the Company accepted for purchase an additional $0.1 million aggregate principal amount of the outstanding Senior Notes due 2015 that were tendered prior to the expiration of the tender offer on March 2, 2012. On March 19, 2012, the Company redeemed the remaining $8.3 million aggregate principal amount that was not tendered.
	The Company funded the purchases and redemptions of the Senior Notes due 2015 with the issuance of $130.0 million aggregate principal amount of additional Senior Notes on February 17, 2012. The proceeds from this issuance, together with cash on hand and borrowings under the Revolving Loan, funded the payment of $129.0 million aggregate principal amount of Senior Notes due 2015, $7.9 million in tender and redemption premiums and $5.0 million of accrued and unpaid interest, along with transaction fees and expenses.
	In connection with these transactions, the Company recorded a loss on extinguishment of long-term debt of $9.4 million in the Company's consolidated statement of operations for the year ended December 31, 2012. This loss represented $7.9 million in tender and redemption premiums and $1.5 million for the write-off of the remaining unamortized deferred financing costs related to the Senior Notes due 2015.
	8.5% Senior Notes due 2019 (“Senior Notes”)
	At December 31, 2013, the outstanding principal amount of Senior Notes was $1,305.0 million, excluding $4.2 million in unamortized premium. The Senior Notes mature on April 1, 2019.
	On February 17, 2012, the Company issued $130.0 million aggregate principal amount of additional Senior Notes at an issue price of 104.375% of par. The $5.7 million premium received is reported on the consolidated balance sheet as an addition to the face amount of the Senior Notes and is being amortized as a reduction of interest expense over the term of the related debt.
	As discussed above, on April 13, 2011, the Company issued $725.0 million aggregate principal amount of Senior Notes and on May 20, 2011, the Company issued an additional $450.0 million aggregate principal amount of Senior Notes. The proceeds from these issuances together with cash on hand and borrowings under the then-outstanding revolving loan credit facility were used to fund the Senior Notes due 2015 Tender Offers.
	CDW LLC and CDW Finance Corporation are the co-issuers of the Senior Notes. Obligations under the Senior Notes are guaranteed on an unsecured senior basis by Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries. The Senior Note indenture contains negative covenants that, among other things, place restrictions and limitations on the ability of Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries to dispose of assets, incur additional indebtedness, incur guarantee obligations, prepay other indebtedness, make distributions or other restricted payments, create liens, make equity or debt investments, make acquisitions, engage in mergers or consolidations, or engage in certain transactions with affiliates. The Senior Notes do not contain any financial covenants.
	12.535% Senior Subordinated Exchange Notes due 2017 (“Senior Subordinated Notes”)
	At December 31, 2013, the outstanding principal amount of the Senior Subordinated Notes was $92.5 million. The Senior Subordinated Notes have a maturity date of October 12, 2017.
	On October 18, 2013, the Company redeemed $155.0 million aggregate principal amount of Senior Subordinated Notes at a redemption price that was 104.178% of the principal amount redeemed. A combination of cash on hand and the net proceeds from the sale of shares of common stock related to the underwriters' July 26, 2013 exercise in full of the overallotment option granted to them in connection with the IPO, in the amount of $56.0 million, was used to fund the redemption of $155.0 million aggregate principal amount, $6.5 million of redemption premium and $0.2 million in accrued and unpaid interest to the date of redemption. See Note 9 for additional discussion of the underwriters' overallotment option. In connection with this redemption, the Company recorded a loss on extinguishment of long-term debt of $8.5 million in the Company's consolidated statement of operations for the year ended December 31, 2013. This loss represented $6.5 million in redemption premium and $2.0 million for the write-off of a portion of the remaining unamortized deferred financing costs related to the Senior Subordinated Notes.
	On August 1, 2013, the Company redeemed $324.0 million aggregate principal amount of Senior Subordinated Notes at a redemption price that was 106.268% of the principal amount redeemed. The Company used a portion of the net proceeds from the IPO to redeem $146.0 million aggregate principal amount of Senior Subordinated Notes and incremental borrowings of $190.0 million under the Term Loan to redeem $178.0 million aggregate principal amount of Senior Subordinated Notes. The Company used cash on hand to pay $12.0 million of accrued and unpaid interest to the date of redemption. In connection with this redemption, the Company recorded a loss on extinguishment of long-term debt of $24.6 million in the consolidated statement of operations for the year ended December 31, 2013. This loss represented $20.3 million in redemption premium and $4.3 million for the write-off of a portion of the remaining deferred financing costs related to the Senior Subordinated Notes.
	On March 8, 2013, the Company redeemed $50.0 million aggregate principal amount of Senior Subordinated Notes at a redemption price that was 106.268% of the principal amount redeemed. Cash on hand was used to fund the redemption of $50.0 million aggregate principal amount, $3.1 million of redemption premium and $2.5 million in accrued and unpaid interest to the date of redemption. In connection with this redemption, the Company recorded a loss on extinguishment of long-term debt of $3.9 million in the Company's consolidated statement of operations for the year ended December 31, 2013. This loss represented $3.1 million in redemption premium and $0.8 million for the write-off of a portion of the remaining unamortized deferred financing costs related to the Senior Subordinated Notes.
	On December 21, 2012, the Company redeemed $100.0 million aggregate principal amount of Senior Subordinated Notes at a redemption price that was 106.268% of the principal amount redeemed. Cash on hand was used to fund the redemption of $100.0 million aggregate principal amount, $6.3 million of redemption premium and $2.3 million in accrued and unpaid interest to the date of redemption. In connection with this redemption, the Company recorded a loss on extinguishment of long-term debt of $7.8 million in the Company's consolidated statement of operations for the year ended December 31, 2012. This loss represented $6.3 million in redemption premium and $1.5 million for the write-off of a portion of the remaining unamortized deferred financing costs related to the Senior Subordinated Notes.
	CDW LLC and CDW Finance Corporation are the co-issuers of the Senior Subordinated Notes. Obligations under the Senior Subordinated Notes are guaranteed on an unsecured senior basis by Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries. The Senior Subordinated Note indenture contains negative covenants that, among other things, place restrictions and limitations on the ability of Parent and each of CDW LLC's direct and indirect, 100% owned, domestic subsidiaries to dispose of assets, incur additional indebtedness, incur guarantee obligations, prepay other indebtedness, make distributions or other restricted payments, create liens, make equity or debt investments, make acquisitions, engage in mergers or consolidations, or engage in certain transactions with affiliates. The Senior Subordinated Notes do not contain any financial covenants.
	Long-Term Debt Maturities
	As of December 31, 2013, the maturities of long-term debt were as follows:
	(in millions)
	Years ending December 31,
	2014	$	45.4
	2015	15.4
2016	15.4
2017	77.9
2018	340.4
Thereafter	2,756.90
	$	3,251.40
See Note 19 for a description of refinancing transactions completed during 2014.
Fair Value
The fair value of the Company's long-term debt instruments at December 31, 2013 was $3,415.2 million. The fair value of the Senior Secured Notes, Senior Notes and Senior Subordinated Notes is estimated using quoted market prices for identical assets or liabilities that are traded in over-the-counter secondary markets that are not considered active. The fair value of the Term Loan is estimated using dealer quotes for identical assets or 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.
At December 31, 2013, the carrying value of the Company's long-term debt was $3,251.4 million, excluding $4.2 million in unamortized premium and $4.4 million in unamortized discount.
Deferred Financing Costs
The following table summarizes the deferred financing costs activity for the years ended December 31, 2013 and 2012:
(in millions)	December 31,
	2013				2012
Beginning balance	$	53.2			$	68.5
Additional costs capitalized	6.1				2.1
Recognized in interest expense	(9.1		)		(14.4		)
Write-off of unamortized deferred financing costs	(20.1		)		(3.0		)
Ending balance	$	30.1			$	53.2
As of December 31, 2013 and December 31, 2012, the weighted-average remaining life of unamortized deferred financing costs was 4.9 and 5.1 years, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Income before income taxes was taxed under the following jurisdictions:
	(in millions)	Years Ended December 31,
		2013			2012				2011
	Domestic	$	179.4		$	170.3			$	11.4
	Foreign	16.1			15.8				16.9
	Total	$	195.5		$	186.1			$	28.3
	Components of the income tax expense (benefit) consisted of the following:
	(in millions)	Years Ended December 31,
		2013			2012				2011
	Current:
	Federal	$	96.7		$	110.3			$	17.9
	State	10.1			8				(0.6		)
	Foreign	4.6			5.1				4.1
	Total current	111.4			123.4				21.4
	Deferred:
	Domestic	(48.6		)	(56.2		)		(9.9		)
	Foreign	(0.1		)	(0.1		)		(0.3		)
	Total deferred	(48.7		)	(56.3		)		(10.2		)
	Income tax expense	$	62.7		$	67.1			$	11.2
	The reconciliation between the statutory tax rate expressed as a percentage of income before income taxes and the effective tax rate is as follows:
	(dollars in millions)	Years Ended December 31,
		2013						2012						2011
	Statutory federal income tax rate	$	68.4		35	%		$	65.1			35	%	$	9.9		35	%
	State taxes, net of federal effect	(5.0		)	(2.6	)		0.4				0.2		(3.4		)	(11.8	)
	Equity-based compensation	1.5			0.7			5.7				3.1		5.1			17.9
	Effect of rates different than statutory	(1.4		)	(0.7	)		(1.4		)		(0.8	)	(1.1		)	(4.0	)
	Valuation allowance	—			—			—				—		(0.9		)	(3.1	)
	Other	(0.8		)	(0.3	)		(2.7		)		(1.5	)	1.6			5.7
	Effective tax rate	$	62.7		32.1	%		$	67.1			36	%	$	11.2		39.7	%
	The tax effect of temporary differences that give rise to the net deferred income tax liability is presented below:
	(in millions)	December 31,
		2013			2012
	Deferred Tax Assets:
	Deferred interest	$	42.5		$	58.3
	State net operating loss and credit carryforwards, net	20.6			18
	Payroll and benefits	16.2			16.7
	Rent	6.4			1.2
	Accounts receivable	5.4			4.2
	Equity compensation plans	1.6			10.3
	Trade credits	1.5			1.8
	Interest rate caps	0.8			1.8
	Charitable contribution carryforward	0.5			4.1
	Deferred financing costs	0.2			2.3
	Other	7.1			7.2
	Total deferred tax assets	102.8			125.9
	Deferred Tax Liabilities:
	Software and intangibles	486.2			551.4
	Deferred income	145.5			146.3
	Property and equipment	25			29.3
	Other	11.6			9.1
	Total deferred tax liabilities	668.3			736.1
	Deferred tax asset valuation allowance	—			—
	Net deferred tax liability	$	565.5		$	610.2
	The Company has state income tax net operating loss carryforwards of $202.8 million, which will expire at various dates from 2014 through 2033 and state tax credit carryforwards of $17.0 million, which expire at various dates from 2016 through 2018.
	The Company has not provided for U.S. federal income taxes or tax benefits on the undistributed earnings of its international subsidiary because such earnings are reinvested and it is currently intended that they will continue to be reinvested indefinitely. At December 31, 2013, the Company has not provided for federal income taxes on earnings of approximately $52.5 million from its international subsidiary.
	The Company had no unrecognized tax benefits at December 31, 2013, 2012 and 2011.
	In the ordinary course of business, the Company is subject to review by domestic and foreign taxing authorities, including the Internal Revenue Service (“IRS”). In general, the Company is no longer subject to audit by the IRS for tax years through 2010 and state, local or foreign taxing authorities for tax years through 2008. Various other taxing authorities are in the process of auditing income tax returns of the Company and its subsidiaries. The Company does not anticipate that any adjustments from the audits would have a material impact on its consolidated financial position, results of operations or cash flows.
	The Company accrues net interest and penalties related to unrecognized tax benefits in income tax expense in its consolidated statements of operations. For the years ended December 31, 2013, 2012 and 2011, the Company had no liability recorded for the payment of interest and penalties on unrecognized tax benefits and did not recognize any such interest and penalty expense.

Shareholders_Equity_Notes

Shareholders' Equity (Notes)	12 Months Ended
	Dec. 31, 2013
Shareholders' Equity [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	Shareholders' Equity
	On July 2, 2013, the Company completed an IPO of 23,250,000 shares of common stock. On July 31, 2013, the Company completed the sale of an additional 3,487,500 shares of common stock to the underwriters of the IPO pursuant to the underwriters' July 26, 2013 exercise in full of the overallotment option granted to them in connection with the IPO. Such shares were registered under the Securities Act of 1933, as amended, pursuant to the Company's Registration Statement on Form S-1, which was declared effective by the SEC on June 26, 2013. The shares of common stock are listed on the NASDAQ Global Select Market under the symbol “CDW.” The Company's shares of common stock were sold to the underwriters at a price of $17.00 per share in the IPO and upon the exercise of the overallotment option, which together, generated aggregate net proceeds of $424.7 million to the Company after deducting underwriting discounts, expenses and transaction costs.
	On November 19, 2013, the Company completed a secondary public offering, whereby certain selling stockholders sold 15,000,000 shares of common stock. On December 18, 2013, such selling stockholders sold an additional 2,250,000 shares of common stock to the underwriters of the secondary public offering pursuant to the underwriters' December 13, 2013 exercise in full of the overallotment option granted to them in connection with the secondary public offering. The Company did not receive any proceeds from the sale of shares in the secondary public offering or upon the exercise of the overallotment option.
	The following pre-tax IPO- and secondary-offering related expenses were included within selling and administrative expenses in the consolidated statement of operations for the year ended December 31, 2013:
	(in millions)	Year Ended December 31, 2013
	Acceleration charge for certain equity awards and related employer payroll taxes(1)	$	40.7
	RDU Plan cash retention pool accrual(2)	7.5
	Management services agreement termination fee(3)	24.4
	Other expenses	2.4
	IPO- and secondary-offering related expenses	$	75
	(1)See Note 10 for additional discussion of the impact of the IPO on the Company's equity awards.
	(2)See Note 12 for additional discussion of this transaction.
	(3)Represents the payment of a termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities.
	In June 2013, the Company’s Board of Directors and the Company's sole shareholder at that time, CDW Holdings, approved the reclassification of the Company’s Class A common shares and Class B common shares into a single class of common shares and a 143.0299613-for-1 stock split, effective immediately. The par value of the common shares was maintained at $0.01 per share. All references to common shares and per share amounts in the accompanying consolidated financial statements have been adjusted to reflect the reclassification and stock split on a retroactive basis.
	In June 2013, the Company amended and restated its certificate of incorporation to authorize the issuance of 100,000,000 shares of preferred stock with a par value of $0.01. No shares of preferred stock have been issued or are outstanding as of December 31, 2013. Additionally, the amended and restated certificate of incorporation increased the number of authorized common shares to 1,000,000,000.
	On December 2, 2013, the Company paid a cash dividend on the Company's common stock of $0.0425 per share, or $7.3 million, to all stockholders of record as of the close of business on November 15, 2013. See Note 19 for a discussion of the dividend declared during the first quarter of 2014. Future dividends will be subject to the approval of the Company's board of directors.

EquityBased_Compensation

Equity-Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity-Based Compensation	'
	Equity-Based Compensation
	Equity-Based Compensation Plan Descriptions
	CDW has established certain equity-based compensation plans for the benefit of the Company’s coworkers and senior management.
	Pre-IPO Equity Awards
	Prior to the IPO, the Company had the following equity-based compensation plans in place:
	Class B Common Units
	The Board of Managers of CDW Holdings adopted the CDW Holdings LLC 2007 Incentive Equity Plan (the “Plan”) for coworkers, managers, consultants and advisors of the Company and its subsidiaries. The Plan permitted a committee designated by the Board of Managers of CDW Holdings (the “Committee”) to grant or sell to any participant Class A Common Units or Class B Common Units of CDW Holdings in such quantity, at such price, on such terms and subject to such conditions that were consistent with the Plan and as established by the Committee.
	The Class B Common Units that were granted vested daily on a pro rata basis between the date of grant and the fifth anniversary thereof and were subject to repurchase by, with respect to vested units, or forfeiture to, with respect to unvested units, the Company upon the coworker's separation from service as was set forth in each holder’s Class B Common Unit Grant Agreement.
	On June 30, 2011, the Board of Managers approved the terms of a modified Class B Common Unit grant agreement with the Company's former Chief Executive Officer, who retired as the Company's Chief Executive Officer effective October 1, 2011 but continued to serve as Chairman of the Board through December 31, 2012. As a result of this modification, the Company recorded incremental equity-based compensation expense of $6.6 million and $3.3 million during the years ended December 31, 2012 and 2011, respectively.
	MPK II Units
	Contemporaneous with the Acquisition, the Company agreed with Michael P. Krasny, CDW Corporation founder, former chairman and CEO and significant selling shareholder, to establish the MPK Coworker Incentive Plan II (the “MPK Plan”) for the benefit of all of the coworkers of the Company other than members of senior management who received incentive equity awards under the Plan.
	The MPK Plan established an “account” for each eligible participant which was notionally credited with a number of Class A Common Units of CDW Holdings LLC on October 15, 2007, the day the plan was established. The notional units credited to participants' accounts were to cliff-vest at the end of ten years, subject to acceleration upon the occurrence of certain events.
	On July 2, 2013, the Company completed an IPO of its common shares. Under the terms of the MPK Plan, vesting accelerated for all unvested units upon completion of the IPO. The Company recorded a pre-tax charge of $36.7 million for compensation expense related to the acceleration of the expense recognition for MPK Plan units in the year ended December 31, 2013. In connection with the completion of the IPO, the Company distributed common stock to each participant and withheld the number of shares of common stock equal to the required tax withholding for each participant. The Company paid required withholding taxes of $24.0 million to federal, state and foreign taxing authorities. This amount is reported as a financing activity in the consolidated statement of cash flows and as an increase to accumulated deficit in the consolidated statement of shareholders' equity for the year ended December 31, 2013. In addition, the Company paid $4.0 million of employer payroll taxes that are included as an operating activity in the consolidated statement of cash flows for the year ended December 31, 2013.
	In connection with the establishment of the MPK Plan, the Company agreed to make charitable contributions in amounts equal to the net income tax benefits derived from payouts to participants under the MPK Plan (net of any related employer payroll tax costs). The contributions of these amounts are due by March 15 of the calendar year following the year in which the Company realizes the benefits of the deductions. This arrangement has been accounted for as contingent consideration. Pre-2009 business combinations were accounted for under a former accounting standard which, among other aspects, precluded the recognition of certain contingent consideration as of the business combination date. Instead, under the former accounting standard, contingent consideration is accounted for as additional purchase price (goodwill) at the time the contingency is resolved. As of December 31, 2013, the Company has accrued approximately $21 million related to this arrangement within other current liabilities, as the Company expects to realize the tax benefit of the compensation deductions during the 2013 tax year. The Company expects to make the related cash contribution during the first quarter of 2014.
	Post-IPO Equity Awards
	2013 Long-Term Incentive Plan (the "2013 LTIP")
	In June 2013, the Company adopted the 2013 Long-Term Incentive Plan (the "2013 LTIP"). The 2013 LTIP provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units, bonus stock and performance awards. The maximum aggregate number of shares that may be issued under the 2013 LTIP is 11,700,000 shares of the Company's common stock, in addition to the 3,798,508 shares of restricted stock granted in exchange for unvested Class B Common Units in connection with the Company's IPO, as discussed below.
	Restricted Stock
	In connection with the IPO, CDW Holdings distributed all of its shares of the Company's common stock to its existing members in accordance with their respective membership interests. Common stock received by holders of Class B Common Units in connection with the distribution is subject to any vesting provisions previously applicable to the holder's Class B Common Units. Class B Common Unit holders received 3,798,508 shares of restricted stock with respect to Class B Common Units that had not yet vested at the time of the distribution. For the year ended December 31, 2013, 1,200,544 shares of such restricted stock vested/settled and 5,931 shares were forfeited. As of December 31, 2013, 2,592,033 shares of restricted stock were outstanding.
	Stock Options
	In addition, in connection with the IPO, the Company issued 1,268,986 stock options to the Class B Common Unit holders to preserve their fully diluted equity ownership percentage. These options were issued with a per-share exercise price equal to the IPO price of $17.00 and are also subject to the same vesting provisions as the Class B Common Units to which they relate. The Company also granted 19,412 stock options under the 2013 LTIP during the year ended December 31, 2013.
	Restricted Stock Units ("RSUs")
	In connection with the IPO, the Company granted 1,416,543 RSUs under the 2013 LTIP at a weighted-average grant-date fair value of $17.03 per unit. The RSUs cliff-vest at the end of four years.
	Valuation Information
	The Company attributes the value of equity-based compensation awards to the various periods during which the recipient must perform services in order to vest in the award using the straight-line method.
	Post-IPO Equity Awards
	The Company has elected to use the Black-Scholes option pricing model to estimate the fair value of stock options granted. The Black-Scholes option pricing model incorporates various assumptions including volatility, expected term, risk-free interest rates and dividend yields. The assumptions used to value the stock options granted during the year ended December 31, 2013 are presented below.
		Year Ended December 31,
	Assumptions	2013
	Weighted-average grant date fair value	$	4.75
	Weighted-average volatility (1)	35		%
	Weighted-average risk-free rate (2)	1.58		%
	Dividend yield	1		%
	Expected term (in years) (3)	5.4
	-1	Based upon an assessment of the two-year, five-year and implied volatility for the Company’s selected peer group, adjusted for the Company’s leverage.
	-2	Based on a composite U.S. Treasury rate.
	-3	The expected term is calculated using the simplified method. The simplified method defines the expected term as the average of the option’s contractual term and the option’s weighted-average vesting period. The Company utilizes this method as it has limited historical stock option data that is sufficient to derive a reasonable estimate of the expected stock option term.
	The following table sets forth a summary of the Company's stock option activity for the year ended December 31, 2013:
	Options	Number of Options		Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value (millions)
	Outstanding at January 1, 2013	—		$	—
	Granted	1,288,398		$	17
	Forfeited/Expired	(8,143	)	$	17
	Exercised	—		$	—			N/A
	Outstanding at December 31, 2013	1,280,255		$	17		8.4	$	8.1
	Vested at December 31, 2013	393,517		$	17		8	$	2.5
	Exercisable at December 31, 2013	393,517		$	17		8	$	2.5
	Expected to vest at December 31, 2013	852,713		$	17		8.6	$	5.4
	The following table sets forth a summary of the Company's RSU activity for the year ended December 31, 2013:
		Number of Units		Weighted-Average Grant-Date Fair Value
	Nonvested at January 1, 2013	—		$	—
	Granted	1,416,543		17.03
	Vested/Settled	(1,844	)	17
	Forfeited	(63,127	)	17.01
	Nonvested at December 31, 2013	1,351,572		$	17.04
	The aggregate fair value of restricted stock and RSUs that vested during the year ended December 31, 2013, was $26.7 million.
	Pre-IPO Equity Awards
	The grant date fair value of Class B Common Unit grants was calculated using the Option-Pricing Method. This method considered Class A Common Units and Class B Common Units as call options on the total equity value, giving consideration to liquidation preferences and conversion of the preferred units. Such Class A Common Units and Class B Common Units were modeled as call options that gave their owners the right, but not the obligation, to buy the underlying equity value at a predetermined (or exercise) price. Class B Common Units were considered to be call options with a claim on equity value at an exercise price equal to the remaining value immediately after the Class A Common Units and Class B Common Units with a lower participation threshold were liquidated. The Option-Pricing Method is highly sensitive to key assumptions, such as the volatility assumption. As such, the use of this method can be applied when the range of possible future outcomes is difficult to predict.
	The following table summarizes the assumptions and resulting fair value of the Class B Common Unit grants for the years ended December 31, 2013, 2012 and 2011:
		Class B Common Units
		Years Ended December 31,
	Assumptions	2013				2012				2011
	Weighted-average grant date fair value	$	119			$	125.65			$	148.89
	Weighted-average volatility	65.5		%		65.26		%		82.87		%
Weighted-average risk-free rate	0.18		%		0.19		%		0.84		%
Dividend yield	0		%		0		%		0		%
The Company calculated the expected future volatility based upon an assessment of the two-year, five-year and implied volatility for the Company’s selected peer group, adjusted for the Company’s leverage.
The risk-free interest rate of return used is based on a composite U.S. Treasury rate.
Notional units granted under the MPK Plan were valued on the grant date at $1,000 per unit, the fair value equivalent of the Class A Common Units at the time the awards were granted.
The following table sets forth a summary of equity plan activity for the year ended December 31, 2013:
	Class B				MPK Plan
	Common Units				Units
Outstanding at January 1, 2013	216,483				66,137
Granted	400				—
Forfeited	(860	)			(2,228	)
Converted/Settled (1)	(216,023	)			(63,909	)
Outstanding at December 31, 2013	—				—
Vested at December 31, 2013	—				—
-1	As discussed above, the Class B Common Units and MPK Plan Units were converted/settled into shares of the Company's common stock upon completion of the IPO. The converted Class B Common Units, to the extent unvested at the time of the IPO, relate to the grants of restricted stock disclosed above.
Expense Information
The Company’s net income included $46.6 million, $22.1 million and $19.5 million of compensation cost and $16.5 million, $2.3 million and $1.9 million of income tax benefits related to the Company’s equity-based compensation arrangements for the years ended December 31, 2013, 2012 and 2011, respectively. No portion of equity-based compensation was capitalized. Equity-based compensation expense for the year ended December 31, 2013 included incremental expense of $36.7 million related to the acceleration of the expense recognition for MPK units as discussed above. Equity-based compensation expense included incremental expense of $6.6 million and $3.3 million related to the Class B Common Unit modification for the Company's former Chief Executive Officer for the years ended December 31, 2012 and 2011, respectively.
As of December 31, 2013, the Company estimated there was $24.9 million of total unrecognized compensation cost to be recognized over the next 3.3 years.

Earnings_per_Share_Notes

Earnings per Share (Notes)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share [Text Block]	'
	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 number of common shares outstanding during the period. The 2013 denominator was impacted by the common shares issued during both the IPO and the underwriters' exercise in full of the overallotment option granted to them in connection with the IPO. Because such common shares were issued on July 2, 2013 and July 31, 2013, respectively, they are only partially reflected in the 2013 denominator. Such shares will be fully reflected in the 2014 denominator. See Note 9 for additional discussion of the IPO.
	The dilutive effect of outstanding restricted stock, restricted stock units, stock options and MPK Plan units is reflected in the denominator for diluted earnings per share using the treasury stock method.
	The following is a reconciliation of basic shares to diluted shares:
		Years Ended December 31,
	(in millions)	2013	2012	2011
	Weighted-average shares - basic	156.6	145.1	144.8
	Effect of dilutive securities	2.1	0.7	0.1
	Weighted-average shares - diluted	158.7	145.8	144.9
	For the years ended December 31, 2013, 2012 and 2011, diluted earnings per share excludes the impact of 0.0 million, 0.0 million, and 4.3 million potential common shares, respectively, as their inclusion would have had an anti-dilutive effect.

Deferred_Compensation_Plan

Deferred Compensation Plan	12 Months Ended
	Dec. 31, 2013
Deferred Compensation Arrangements [Abstract]	'
Deferred Compensation Plan	'
	Deferred Compensation Plan
	On March 10, 2010, in connection with the Company’s purchase of $28.5 million principal amount of its outstanding senior subordinated debt, the Company established the Restricted Debt Unit Plan (the “RDU Plan”), an unfunded nonqualified deferred compensation plan. The total number of RDUs that can be granted under the RDU Plan is 28,500. At December 31, 2013, 28,500 RDUs were outstanding. RDUs that are outstanding vest daily on a pro rata basis over the three-year period from January 1, 2012 (or, if later, the date of hire or the date of a subsequent RDU grant) through December 31, 2014. Participants have no rights to the underlying debt.
	The total amount of compensation available to be paid under the RDU Plan was initially to be based on two components, a principal component and an interest component. The principal component credits the RDU Plan with a notional amount equal to the $28.5 million face value of the Senior Subordinated Notes (the "Debt Pool"), together with certain redemption premium equivalents as noted below. The interest component credits the RDU Plan with amounts equal to the interest that would have been earned on the Debt Pool from March 10, 2010 through maturity on October 12, 2017, except as discussed below. Interest amounts for 2010 and 2011 were deferred until 2012, and thereafter, interest amounts were paid to participants semi-annually on the interest payment due dates. Payments totaling $1.7 million and $1.3 million were made to participants under the RDU Plan in April and October 2013, respectively, in connection with the semi-annual interest payments due.
	The Company used a portion of the IPO proceeds together with incremental borrowings to redeem $324.0 million of the total Senior Subordinated Notes outstanding on August 1, 2013. In connection with the IPO and the partial redemption of the Senior Subordinated Notes, the Company amended the RDU Plan to increase the retentive value of the plan. In accordance with the original terms of the RDU Plan, the principal component of the RDUs converted to a cash-denominated pool upon the redemption of the Senior Subordinated Notes. In addition, the Company added $1.4 million to the principal component in the year ended December 31, 2013 as redemption premium equivalents in accordance with the terms of the RDU plan. Under the terms of the amended RDU Plan, upon the partial redemption of outstanding Senior Subordinated Notes, the RDUs ceased to accrue the proportionate related interest component credits. The amended RDU Plan provides participants the opportunity to share on a pro rata basis in cash retention pools payable to participants who satisfy certain retention requirements. The aggregate amount of the retention pools was determined to be $15.0 million based upon the amount of interest component credits that would have been allocated to the RDU Plan if the Senior Subordinated Notes had remained outstanding from August 1, 2013 through maturity. The Company recorded a pre-tax charge of $7.5 million in the year ended December 31, 2013 for payment of the first cash retention pool. The second cash retention pool payment is expected to be made to participants who remain employed through December 31, 2015 in the first quarter of 2016. Participants continue to accrue an interest component credit for the proportionate amount of Senior Subordinated Notes still outstanding, payable on the aforementioned semi-annual due dates; such payments, however, will be deducted from the second retention pool payment amount of $7.5 million.
	Unrecognized compensation expense as of December 31, 2013 of approximately $9 million is expected to be recognized through 2014 and approximately $7 million in 2015 through 2017. Payments under the RDU Plan may be impacted if certain significant events occur or circumstances change that would impact the financial condition or structure of the Company.
	Compensation expense of $16.8 million, $8.4 million, and $8.1 million related to the RDU Plan was recognized in the years ended December 31, 2013, 2012 and 2011, respectively. At December 31, 2013 and 2012, the Company had $21.8 million and $15.5 million of liabilities related to the RDU Plan recorded on the consolidated balance sheets, respectively.
	Payment of the principal component of the RDU Plan is expected to be made on October 12, 2017, unless accelerated due to a sale of the Company.

Profit_Sharing_And_401K_Plan

Profit Sharing And 401(K) Plan	12 Months Ended
	Dec. 31, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]	'
Profit Sharing And 401(K) Plan	'
	Profit Sharing and 401(k) Plan
	The Company has a profit sharing plan that includes a salary reduction feature established under the Internal Revenue Code Section 401(k) covering substantially all coworkers. Company contributions to the profit sharing plan are made in cash and determined at the discretion of the Board of Directors. For the years ended December 31, 2013, 2012 and 2011, the amounts charged to expense for this plan totaled $17.3 million, $14.6 million and $15.3 million, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Loss Contingency [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 and local authorities, and by various partners and large 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 U.S. bankruptcy laws. In such cases, certain pre-petition payments received by the Company could be considered preference items and subject to return to the bankruptcy administrator.
	As of December 31, 2013, 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.
	The Company previously filed a claim as part of a class action settlement in a case alleging price fixing during the period of January 1, 1996 through December 31, 2006, by certain manufacturers of thin-film liquid crystal display panels. On July 13, 2013, the United Stated District Court for the Northern District of California approved distribution of the settlement proceeds, including a net payment to the Company of $10.4 million after fees and expenses. The Company has recognized a pre-tax benefit of $10.4 million within selling and administrative expenses in the consolidated statement of operations for the year ended December 31, 2013. The first of two settlement payments was received by the Company on July 29, 2013 in the amount of $8.5 million. The balance of $1.9 million was received in February 2014.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2013
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	Related Party Transactions
	The Company had previously entered into a management services agreement with the Sponsors pursuant to which they had agreed to provide it with management and consulting services and financial and other advisory services. Pursuant to such agreement, the Sponsors received an annual management fee of $5.0 million and reimbursement of out-of-pocket expenses incurred in connection with the provision of such services. Such amounts were classified as selling and administrative expenses within the consolidated statements of operations. The management services agreement included customary indemnification and provisions in favor of the Sponsors.
	On July 2, 2013, the Company completed an IPO of its common stock. Using a portion of the net proceeds from the IPO, the Company paid a $24.4 million termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities that was effective upon completion of the IPO. The Company paid an annual management fee of $2.5 million, $5.0 million and $5.0 million in the years ended December 31, 2013, 2012 and 2011, respectively.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	Segment information is presented in accordance with a “management approach,” which designates the internal reporting used by the chief operating decision-maker for making decisions and assessing performance as the source of the Company's reportable segments. The Company's segments are organized in a manner consistent with which separate financial information is available and evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and in assessing performance.
	The Company has two reportable segments: Corporate, which is comprised primarily of business customers, and Public, which is comprised of government entities and education and healthcare institutions. The Company also has two other operating segments, CDW Advanced Services and Canada, which do not meet the reportable segment quantitative thresholds and, accordingly, are combined together as “Other.”
	The Company has centralized logistics and headquarters functions that provide services to the segments. The logistics function includes purchasing, distribution and fulfillment services to support both the Corporate and Public segments. As a result, costs and intercompany charges associated with the logistics function are fully allocated to both of these segments based on a percent of sales. The centralized headquarters function provides services in areas such as accounting, information technology, marketing, legal and coworker services. Headquarters' function costs that are not allocated to the segments are included under the heading of “Headquarters” in the tables below. Depreciation expense is included in Headquarters as it is not allocated among segments or used in measuring segment performance.
	IPO- and secondary-offering related expenses primarily relating to coworker compensation were included within operating segment results for the year ended December 31, 2013. See Note 9 for additional discussion of IPO- and secondary-offering related expenses.
	The Company allocates resources to and evaluates performance of its segments based on net sales, income (loss) from operations and Adjusted EBITDA, a non-GAAP measure as defined in the Company's credit agreements. However, the Company has concluded that income (loss) from operations is the more useful measure in terms of discussion of operating results, as it is a GAAP measure.
	Segment information for total assets and capital expenditures is not presented, as such information is not used in measuring segment performance or allocating resources between segments.
	Selected Segment Financial Information
	The following table presents information about the Company’s segments for the years ended December 31, 2013, 2012 and 2011:
	(in millions)	Corporate			Public				Other				Headquarters				Total
	2013:00:00
	Net sales	$	5,960.10		$	4,164.50			$	644			$	—			$	10,768.60
	Income (loss) from operations	363.3			246.5				27.2				(128.4		)		508.6
	Depreciation and amortization expense	(97.3		)	(44.0		)		(8.6		)		(58.3		)		(208.2		)
	IPO- and secondary-offering related expenses	(26.4		)	(14.4		)		(3.6		)		(30.6		)		(75.0		)
	2012:00:00
	Net sales	$	5,512.80		$	4,023.00			$	592.4			$	—			$	10,128.20
	Income (loss) from operations	349			246.7				18.6				(103.7		)		510.6
	Depreciation and amortization expense	(97.6		)	(44.0		)		(9.3		)		(59.3		)		(210.2		)
	IPO- and secondary-offering related expenses	—			—				—				—				—
	2011:00:00
	Net sales	$	5,334.40		$	3,757.20			$	510.8			$	—			$	9,602.40
	Income (loss) from operations	331.6			233.3				17.5				(111.7		)		470.7
	Depreciation and amortization expense	(97.4		)	(43.9		)		(8.7		)		(54.9		)		(204.9		)
	IPO- and secondary-offering related expenses	—			—				—				—				—
	Major Customers, Geographic Areas, and Product Mix
	Net sales to the federal government were $764.4 million, $964.7 million and $953.6 million and accounted for approximately 7%, 10% and 10% of total net sales in 2013, 2012 and 2011, respectively. Net sales to customers outside of the U.S., primarily in Canada, were approximately 4% of the Company's total net sales in 2013, 2012 and 2011. Approximately 1% and 2% of the Company’s long-lived assets were located outside of the U.S. as of December 31, 2013 and 2012, respectively.
	The following table presents net sales by major category for the years ended December 31, 2013, 2012 and 2011. Categories are based upon internal classifications. Amounts for the years ended December 31, 2012 and 2011 have been reclassified for certain changes in individual product classifications to conform to the presentation for the year ended December 31, 2013.
		Year Ended						Year Ended							Year Ended
		December 31, 2013						December 31, 2012							December 31, 2011
		Dollars in			Percentage			Dollars in				Percentage			Dollars in				Percentage
		Millions			of Total Net			Millions				of Total Net			Millions				of Total Net
					Sales							Sales							Sales
	Notebooks/Mobile Devices	$	1,706.00		15.8	%		$	1,470.10			14.5	%		$	1,336.90			13.9	%
	NetComm Products	1,489.10			13.8			1,351.10				13.3			1,237.70				12.9
	Enterprise and Data Storage (Including Drives)	998.1			9.3			979.4				9.7			929.9				9.7
	Other Hardware	4,173.30			38.8			4,068.80				40.2			3,988.30				41.5
	Software	1,994.70			18.5			1,849.40				18.3			1,767.20				18.4
	Services	327.1			3			284.6				2.8			254.3				2.6
	Other (1)	80.3			0.8			124.8				1.2			88.1				1
	Total net sales	$	10,768.60		100	%		$	10,128.20			100	%		$	9,602.40			100	%
	-1	Includes items such as delivery charges to customers and certain commission revenue.

Supplemental_Guarantor_Informa

Supplemental Guarantor Information	12 Months Ended
	Dec. 31, 2013
Supplemental Guarantor Information [Abstract]	'
Supplemental Guarantor Information	'
	Supplemental Guarantor Information
	As described in Note 7, the Senior Secured Notes, Senior Subordinated Notes and Senior Notes are guaranteed by Parent and each of CDW LLC’s direct and indirect, 100% owned, domestic subsidiaries (the “Guarantor Subsidiaries”). All guarantees by Parent and Guarantor Subsidiaries are joint and several, and full and unconditional; provided that each guarantee by the Guarantor Subsidiaries is subject to certain customary release provisions contained in the indentures governing the Senior Secured Notes, Senior Subordinated Notes and Senior Notes. CDW LLC’s Canada subsidiary (the “Non-Guarantor Subsidiary”) does 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 Subsidiary is 100% owned by CDW LLC.
	The following tables set forth condensed consolidating balance sheets as of December 31, 2013 and 2012, consolidating statements of operations for the years ended December 31, 2013, 2012 and 2011, condensed consolidating statements of comprehensive income for the years ended December 31, 2013, 2012 and 2011, and condensed consolidating statements of cash flows for the years ended December 31, 2013, 2012 and 2011, 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 Subsidiary, and the accounts of CDW Finance Corporation (the “Co-Issuer”) for the periods indicated. The information was prepared on the same basis as the Company’s consolidated financial statements.
	Condensed Consolidating Balance Sheet
	December 31, 2013
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Assets
	Current assets:
	Cash and cash equivalents	$	—		$	196.5		$	—		$	14		$	—	$	(22.4	)	$	188.1
	Accounts receivable, net	—			—			1,375.90			75.1			—		—			1,451.00
	Merchandise inventory	—			—			378.9			3.1			—		—			382
	Miscellaneous receivables	—			49.9			91			5.4			—		—			146.3
	Prepaid expenses and other	—			10.7			33.4			5.1			—		(3.1		)	46.1
	Total current assets	—			257.1			1,879.20			102.7			—		(25.5		)	2,213.50
	Property and equipment, net	—			69.7			59.6			1.8			—		—			131.1
	Goodwill	—			751.9			1,439.00			29.4			—		—			2,220.30
	Other intangible assets, net	—			338.5			982.8			6.7			—		—			1,328.00
	Deferred financing costs, net	—			30.1			—			—			—		—			30.1
	Other assets	4.9			1.4			0.1			0.9			—		(5.7		)	1.6
	Investment in and advances to subsidiaries	706.8			2,909.40			—			—			—		(3,616.2		)	—
	Total assets	$	711.7		$	4,358.10		$	4,360.70		$	141.5		$	—	$	(3,647.4	)	$	5,924.60
	Liabilities and Shareholders’ Equity
	Current liabilities:
	Accounts payable-trade	$	—		$	21.4		$	637.3		$	26.5		$	—	$	(22.4	)	$	662.8
	Accounts payable-inventory financing	—			—			256.6			—			—		—			256.6
	Current maturities of long-term debt	—			45.4			—			—			—		—			45.4
	Deferred revenue	—			—			89.9			4.9			—		—			94.8
	Accrued expenses	—			163.5			175.1			7.5			—		(3.1		)	343
	Total current liabilities	—			230.3			1,158.90			38.9			—		(25.5		)	1,402.60
	Long-term liabilities:
	Debt	—			3,205.80			—			—			—		—			3,205.80
	Deferred income taxes	—			178.3			388.4			1.6			—		(4.8		)	563.5
	Other liabilities	—			36.9			3.6			1.4			—		(0.9		)	41
	Total long-term liabilities	—			3,421.00			392			3			—		(5.7		)	3,810.30
	Total shareholders’ equity	711.7			706.8			2,809.80			99.6			—		(3,616.2		)	711.7
	Total liabilities and shareholders' equity	$	711.7		$	4,358.10		$	4,360.70		$	141.5		$	—	$	(3,647.4	)	$	5,924.60
	Condensed Consolidating Balance Sheet
	December 31, 2012
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Assets
	Current assets:
	Cash and cash equivalents	$	—		$	48		$	—		$	9.8		$	—	$	(19.9	)	$	37.9
	Accounts receivable, net	—			—			1,217.70			67.3			—		—			1,285.00
	Merchandise inventory	—			—			313.2			1.4			—		—			314.6
	Miscellaneous receivables	—			61.7			82			4.8			—		—			148.5
	Deferred income taxes	—			8.7			5.5			(0.1		)	—		—			14.1
	Prepaid expenses and other	—			10.1			24.4			0.1			—		—			34.6
	Total current assets	—			128.5			1,642.80			83.3			—		(19.9		)	1,834.70
	Property and equipment, net	—			73.9			66.2			2.6			—		—			142.7
	Goodwill	—			749.4			1,428.50			31.4			—		—			2,209.30
	Other intangible assets, net	—			348.6			1,121.70			8.2			—		—			1,478.50
	Deferred financing costs, net	—			53.2			—			—			—		—			53.2
	Other assets	5.4			1.1			0.4			0.6			—		(5.9		)	1.6
	Investment in and advances to subsidiaries	131.1			2,946.00			—			—			—		(3,077.1		)	—
	Total assets	$	136.5		$	4,300.70		$	4,259.60		$	126.1		$	—	$	(3,102.9	)	$	5,720.00
	Liabilities and Shareholders' Equity
	Current liabilities:
	Accounts payable-trade	$	—		$	16.5		$	500.3		$	21.7		$	—	$	(19.9	)	$	518.6
	Accounts payable-inventory financing	—			—			249.2			—			—		—			249.2
	Current maturities of long-term debt	—			40			—			—			—		—			40
	Deferred revenue	—			—			57.8			—			—		—			57.8
Accrued expenses	—			139.3			157.4			5.9			—		—			302.6
Total current liabilities	—			195.8			964.7			27.6			—		(19.9		)	1,168.20
Long-term liabilities:
Debt	—			3,731.00			—			—			—		—			3,731.00
Deferred income taxes	—			188.1			440			1.7			—		(5.5		)	624.3
Accrued interest	—			8			—			—			—		—			8
Other liabilities	—			46.7			4			1.7			—		(0.4		)	52
Total long-term liabilities	—			3,973.80			444			3.4			—		(5.9		)	4,415.30
Total shareholders’ equity	136.5			131.1			2,850.90			95.1			—		(3,077.1		)	136.5
Total liabilities and shareholders’ equity	$	136.5		$	4,300.70		$	4,259.60		$	126.1		$	—	$	(3,102.9	)	$	5,720.00
Consolidating Statement of Operations
Year Ended December 31, 2013
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net sales	$	—		$	—		$	10,293.30		$	475.3		$	—	$	—		$	10,768.60
Cost of sales	—			—			8,592.10			416.2			—		—			9,008.30
Gross profit	—			—			1,701.20			59.1			—		—			1,760.30
Selling and administrative expenses	24.4			103.9			957.3			35.3			—		—			1,120.90
Advertising expense	—			—			126.8			4			—		—			130.8
(Loss) income from operations	(24.4		)	(103.9		)	617.1			19.8			—		—			508.6
Interest (expense) income, net	—			(250.6		)	0.2			0.3			—		—			(250.1		)
Net loss on extinguishments of long-term debt	—			(64.0		)	—			—			—		—			(64.0		)
Management fee	—			4.3			—			(4.3		)	—		—			—
Other (expense) income, net	—			(0.5		)	1.2			0.3			—		—			1
(Loss) income before income taxes	(24.4		)	(414.7		)	618.5			16.1			—		—			195.5
Income tax benefit (expense)	9.2			142.2			(209.5		)	(4.6		)	—		—			(62.7		)
(Loss) income before equity in earnings of subsidiaries	(15.2		)	(272.5		)	409			11.5			—		—			132.8
Equity in earnings of subsidiaries	148			420.5			—			—			—		(568.5		)	—
Net income	$	132.8		$	148		$	409		$	11.5		$	—	$	(568.5	)	$	132.8
Consolidating Statement of Operations
Year Ended December 31, 2012
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net sales	$	—		$	—		$	9,683.00		$	445.2		$	—	$	—		$	10,128.20
Cost of sales	—			—			8,071.50			387.1			—		—			8,458.60
Gross profit	—			—			1,611.50			58.1			—		—			1,669.60
Selling and administrative expenses	—			103.7			891.6			34.2			—		—			1,029.50
Advertising expense	—			—			125.1			4.4			—		—			129.5
(Loss) income from operations	—			(103.7		)	594.8			19.5			—		—			510.6
Interest (expense) income, net	—			(308.0		)	0.4			0.2			—		—			(307.4		)
Net loss on extinguishments of long-term debt	—			(17.2		)	—			—			—		—			(17.2		)
Management fee	—			3.8			—			(3.8		)	—		—			—
Other income (expense), net	—			—			0.2			(0.1		)	—		—			0.1
(Loss) income before income taxes	—			(425.1		)	595.4			15.8			—		—			186.1
Income tax benefit (expense)	—			210.6			(272.6		)	(5.1		)	—		—			(67.1		)
(Loss) income before equity in earnings of subsidiaries	—			(214.5		)	322.8			10.7			—		—			119
Equity in earnings of subsidiaries	119			333.5			—			—			—		(452.5		)	—
Net income	$	119		$	119		$	322.8		$	10.7		$	—	$	(452.5	)	$	119
Consolidating Statement of Operations
Year Ended December 31, 2011
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net sales	$	—		$	—		$	9,222.40		$	380		$	—	$	—		$	9,602.40
Cost of sales	—			—			7,688.80			330.1			—		—			8,018.90
Gross profit	—			—			1,533.60			49.9			—		—			1,583.50
Selling and administrative expenses	—			111.7			849.2			29.2			—		—			990.1
Advertising expense	—			—			119			3.7			—		—			122.7
(Loss) income from operations	—			(111.7		)	565.4			17			—		—			470.7
Interest (expense) income, net	—			(324.5		)	0.2			0.1			—		—			(324.2		)
Net loss on extinguishments of long-term debt	—			(118.9		)	—			—			—		—			(118.9		)
Management fee	—			9.2			—			(9.2		)	—		—			—
Other income (expense), net	—			0.4			0.5			(0.2		)	—		—			0.7
(Loss) income before income taxes	—			(545.5		)	566.1			7.7			—		—			28.3
Income tax benefit (expense)	—			215.1			(222.4		)	(3.9		)	—		—			(11.2		)
(Loss) income before equity in earnings of subsidiaries	—			(330.4		)	343.7			3.8			—		—			17.1
Equity in earnings of subsidiaries	17.1			347.5			—			—			—		(364.6		)	—
Net income	$	17.1		$	17.1		$	343.7		$	3.8		$	—	$	(364.6	)	$	17.1
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2013
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Comprehensive income	$	126.1		$	141.3		$	409		$	4.8		$	—	$	(555.1	)	$	126.1
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2012
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Comprehensive income	$	121.5		$	121.5		$	322.8		$	13.2		$	—	$	(457.5	)	$	121.5
Condensed Consolidating Statement of Comprehensive Income
Year Ended December 31, 2011
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Comprehensive income	$	17.2		$	17.2		$	343.7		$	2		$	—	$	(362.9	)	$	17.2
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2013
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net cash (used in) provided by operating activities	$	(15.2	)	$	(130.3	)	$	508.8		$	5.5		$	—	$	(2.5	)	$	366.3
Cash flows from investing activities:
Capital expenditures	—			(40.8		)	(6.2		)	(0.1		)	—		—			(47.1		)
Net cash used in investing activities	—			(40.8		)	(6.2		)	(0.1		)	—		—			(47.1		)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facility	—			63			—			—			—		—			63
Repayments of borrowings under revolving credit facility	—			(63.0		)	—			—			—		—			(63.0		)
Repayments of long-term debt	—			(51.1		)	—			—			—		—			(51.1		)
Proceeds from issuance of long-term debt	—			1,535.20			—			—			—		—			1,535.20
Payments to extinguish long-term debt	—			(2,047.4		)	—			—			—		—			(2,047.4		)
Payment of debt financing costs	—			(6.1		)	—			—			—		—			(6.1		)
Net change in accounts payable-inventory financing	—			—			7.4			—			—		—			7.4
Payment of incentive compensation plan withholding taxes	—			(4.0		)	(19.6		)	(0.5		)	—		—			(24.1		)
Net proceeds from issuance of common shares	424.7			—			—			—			—		—			424.7
Dividends paid	(7.3		)	—			—			—			—		—			(7.3		)
Advances to/from affiliates	(402.2		)	892.6			(490.4		)	—			—		—			—
Other financing activities	—			0.4			—			—			—		—			0.4
Net cash provided by (used in) financing activities	15.2			319.6			(502.6		)	(0.5		)	—		—			(168.3		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			(0.7		)	—		—			(0.7		)
Net increase in cash and cash equivalents	—			148.5			—			4.2			—		(2.5		)	150.2
Cash and cash equivalents – beginning of period	—			48			—			9.8			—		(19.9		)	37.9
Cash and cash equivalents – end of period	$	—		$	196.5		$	—		$	14		$	—	$	(22.4	)	$	188.1
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2012
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net cash (used in) provided by operating activities	$	—		$	(204.3	)	$	514.2		$	1.3		$	—	$	6.2		$	317.4
Cash flows from investing activities:
Capital expenditures	—			(27.0		)	(14.0		)	(0.4		)	—		—			(41.4		)
Premium payments on interest rate cap agreements	—			(0.3		)	—			—			—		—			(0.3		)
Net cash used in investing activities	—			(27.3		)	(14.0		)	(0.4		)	—		—			(41.7		)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facility	—			289			—			—			—		—			289
Repayments of borrowings under revolving credit facility	—			(289.0		)	—			—			—		—			(289.0		)
Repayments of long-term debt	—			(201.0		)	—			—			—		—			(201.0		)
Proceeds from issuance of long-term debt	—			135.7			—			—			—		—			135.7
Payments to extinguish long-term debt	—			(243.2		)	—			—			—		—			(243.2		)
Payment of debt financing costs	—			(2.1		)	—			—			—		—			(2.1		)
Net change in accounts payable-inventory financing	—			—			(29.5		)	—			—		—			(29.5		)
Advances to/from affiliates	—			486			(486.5		)	0.5			—		—			—
Other financing activities	—			2.1			—			—			—		—			2.1
Net cash provided by (used in) financing activities	—			177.5			(516.0		)	0.5			—		—			(338.0		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			0.3			—		—			0.3
Net (decrease) increase in cash and cash equivalents	—			(54.1		)	(15.8		)	1.7			—		6.2			(62.0		)
Cash and cash equivalents – beginning of period	—			102.1			15.8			8.1			—		(26.1		)	99.9
Cash and cash equivalents – end of period	$	—		$	48		$	—		$	9.8		$	—	$	(19.9	)	$	37.9
Condensed Consolidating Statement of Cash Flows
Year Ended December 31, 2011
(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
	Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
Net cash (used in) provided by operating activities	$	—		$	(93.8	)	$	327.5		$	(0.3	)	$	—	$	(18.7	)	$	214.7
Cash flows from investing activities:
Capital expenditures	—			(33.4		)	(10.6		)	(1.7		)	—		—			(45.7		)
Cash settlements on interest rate swap agreements	—			(6.6		)	—			—			—		—			(6.6		)
Premium payments on interest rate cap agreements	—			(3.7		)	—			—			—		—			(3.7		)
Net cash used in investing activities	—			(43.7		)	(10.6		)	(1.7		)	—		—			(56.0		)
Cash flows from financing activities:
Proceeds from borrowings under revolving credit facility	—			1,295.00			—			—			—		—			1,295.00
Repayments of borrowings under revolving credit facility	—			(1,483.2		)	—			—			—		—			(1,483.2		)
Repayments of long-term debt	—			(132.0		)	—			—			—		—			(132.0		)
Proceeds from issuance of long-term debt	—			1,175.00			—			—			—		—			1,175.00
Payments to extinguish long-term debt	—			(1,175.0		)	—			—			—		—			(1,175.0		)
Payment of debt financing costs	—			(26.3		)	—			—			—		—			(26.3		)
Net change in accounts payable-inventory financing	—			—			250.5			—			—		—			250.5
Advances to/from affiliates	—			552.6			(552.7		)	0.1			—		—			—
Other financing activities	—			0.6			—			—			—		—			0.6
Net cash provided by (used in) financing activities	—			206.7			(302.2		)	0.1			—		—			(95.4		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			—			—		—			—
Net increase (decrease) in cash and cash equivalents	—			69.2			14.7			(1.9		)	—		(18.7		)	63.3
Cash and cash equivalents – beginning of period	—			32.9			1.1			10			—		(7.4		)	36.6
Cash and cash equivalents – end of period	$	—		$	102.1		$	15.8		$	8.1		$	—	$	(26.1	)	$	99.9

Selected_Quarterly_Financial_R

Selected Quarterly Financial Results	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Data [Abstract]	'
Selected Quarterly Financial Results	'
	Selected Quarterly Financial Results (unaudited)
	(in millions, except per-share amounts)	2013
		First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	Net Sales Detail:
	Corporate:
	Medium/Large	$	1,146.20	$	1,271.40	$	1,203.40		$	1,281.60
	Small Business	257.7		266		262.4			271.4
	Total Corporate	1,403.90		1,537.40		1,465.80			1,553.00
	Public:
	Government	252.3		295.7		375.3			327.3
	Education	232.2		420.6		513.4			282.8
	Healthcare	362.3		366.3		355.9			380.4
	Total Public	846.8		1,082.60		1,244.60			990.5
	Other	161		159.3		153.9			169.8
	Net sales	$	2,411.70	$	2,779.30	$	2,864.30		$	2,713.30
	Gross profit	$	402	$	451.6	$	458.4		$	448.3
	Income from operations (1)	$	120.1	$	153.6	$	92.9		$	142
	Net income (loss) (1)	$	28.3	$	46.7	$	(2.2	)	$	60
	Net income (loss) per common share (1) (2):
	Basic	$	0.19	$	0.32	$	(0.01	)	$	0.35
	Diluted	$	0.19	$	0.32	$	(0.01	)	$	0.35
	(in millions, except per-share amounts)	2012
		First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	Net Sales Detail:
	Corporate:
	Medium/Large	$	1,089.60	$	1,124.70	$	1,055.70		$	1,178.50
	Small Business	273.2		269.7		257.1			264.3
	Total Corporate	1,362.80		1,394.40		1,312.80			1,442.80
	Public:
	Government	262.6		318		408.6			404.9
	Education	221.7		349.5		394.7			226.4
	Healthcare	333.3		372.9		360.4			370
	Total Public	817.6		1,040.40		1,163.70			1,001.30
	Other	138.8		149.9		146.8			156.9
	Net sales	$	2,319.20	$	2,584.70	$	2,623.30		$	2,601.00
	Gross profit	$	384.6	$	426.9	$	432.7		$	425.4
	Income from operations	$	103.6	$	136.4	$	139.7		$	130.9
	Net income	$	10.9	$	36.8	$	38		$	33.3
	Net income per common share (2):
	Basic	$	0.08	$	0.25	$	0.26		$	0.23
	Diluted	$	0.07	$	0.25	$	0.26		$	0.23
	-1	The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.
	-2	Basic and diluted net income (loss) per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income (loss) per share.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent Events
	The Company redeemed $30.0 million and $20.0 million aggregate principal amounts of Senior Subordinated Notes on January 22, 2014 and February 21, 2014, respectively. The redemption prices were 104.178% of the principal amounts redeemed plus $1.0 million and $0.9 million in accrued and unpaid interest to the date of each redemption, respectively. Following these redemptions, $42.5 million aggregate principal amount of the Senior Subordinated Notes remain outstanding. In connection with these redemptions, the Company expects to record a loss on extinguishment of long-term debt of $2.7 million in the consolidated statement of operations during the first quarter of 2014. This loss represents $2.1 million in redemption premiums and $0.6 million for the write-off of a portion of the remaining deferred financing costs related to the Senior Subordinated Notes.
	On February 13, 2014, the Company announced that its board of directors declared a cash dividend on the Company's common stock of $0.0425 per share. The dividend will be paid on March 10, 2014 to all stockholders of record as of the close of business on February 25, 2014. Future dividends will be subject to the approval of the Company's board of directors.

Subsequent_Events_Parenthetica

Subsequent Events Parentheticals (Notes) (Subordinated Debt [Member])	Feb. 21, 2014	Jan. 22, 2014	Oct. 18, 2013	Aug. 01, 2013	Mar. 08, 2013	Dec. 21, 2012
Subordinated Debt [Member]	'	'	'	'	'	'
Subsequent Events [Abstract]	'	'	'	'	'	'
Redemption Premium, percentage of par value	104.18%	104.18%	104.18%	106.27%	106.27%	106.27%

Valuation_And_Qualifying_Accou

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation and Qualifying Accounts [Abstract]	'
Valuation And Qualifying Accounts	'
	SCHEDULE II – VALUATION AND QUALIFYING ACCOUNTS
	Years ended December 31, 2013, 2012 and 2011
	(in millions)
		Balance at		Charged to		Deductions			Balance at
		Beginning		Costs and					End of
		of Period		Expenses					Period
	Allowance for doubtful accounts:
	Year Ended December 31, 2013	$	5.4	$	2.8	$	(2.8	)	$	5.4
	Year Ended December 31, 2012	5.4		3.9		(3.9		)	5.4
	Year Ended December 31, 2011	5		3.6		(3.2		)	5.4
	Reserve for sales returns:
	Year Ended December 31, 2013	$	4.4	$	35	$	(34.3	)	$	5.1
	Year Ended December 31, 2012	4.5		33.2		(33.3		)	4.4
	Year Ended December 31, 2011	3.2		32		(30.7		)	4.5

Description_Of_Business_And_Su1

Description Of Business And Summary Of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Description of Business and Summary of Significant Accounting Policies [Abstract]	'
Basis of Accounting, Policy	'
	Basis of Presentation
	The accompanying 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 (“SEC”).
	On October 12, 2007, CDW Corporation, an Illinois corporation, was acquired through a merger transaction by an entity controlled by investment funds affiliated with Madison Dearborn Partners, LLC and Providence Equity Partners L.L.C. (the “Acquisition”). CDW Corporation continued as the surviving corporation and same legal entity after the Acquisition, but became a wholly owned subsidiary of VH Holdings, Inc., a Delaware corporation.
	On December 31, 2009, CDW Corporation merged into CDWC LLC, an Illinois limited liability company owned by VH Holdings, Inc., with CDWC LLC as the surviving entity. This change had no impact on the operations or management of the Company. On December 31, 2009, CDWC LLC was renamed CDW LLC (“CDW LLC”). On August 17, 2010, VH Holdings, Inc. was renamed CDW Corporation (“Parent”).
	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. On August 6, 2010, CDW Finance Corporation, a Delaware corporation, was formed for the sole purpose of acting as co-issuer of certain debt obligations as described in Note 17 and does not hold any material assets or engage in any business activities or operations.
	Throughout this report, the terms “the Company” and “CDW” refer to Parent and its 100% owned subsidiaries.
	Parent was previously owned directly by CDW Holdings LLC ("CDW Holdings"), a company controlled by investment funds affiliated with Madison Dearborn Partners, LLC ("Madison Dearborn") and Providence Equity Partners L.L.C. ("Providence Equity," and together with Madison Dearborn, the "Sponsors"), certain other co-investors and certain members of CDW management. On July 2, 2013, Parent completed an initial public offering ("IPO") of its common stock. In connection with the IPO, CDW Holdings distributed all of its shares of Parent's common stock to its members in June 2013 in accordance with the members’ respective membership interests and was subsequently dissolved in August 2013. See Note 9 for additional discussion of the IPO.
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 at 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.
Reclassification, Policy	'
	Reclassifications
	Certain reclassifications have been made to the prior period consolidated financial statements to conform to the current period presentation.
Cash and Cash Equivalents, Policy	'
	Cash and Cash Equivalents
	Cash and cash equivalents include all deposits in banks and short-term (original maturities of three months or less), highly liquid investments that are readily convertible to known amounts of cash and are so near maturity that there is insignificant risk of changes in value due to interest rate changes.
Accounts Receivable, Policy	'
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and typically do not bear interest. The Company provides allowances for doubtful accounts related to accounts receivable for estimated losses resulting from the inability of its customers to make required payments. The Company takes into consideration the overall quality of the receivable portfolio along with specifically-identified customer risks.
Merchandise Inventory, Policy	'
	Merchandise Inventory
	Inventory is valued at the lower of cost or market value. Cost is determined using a weighted-average cost method. Price protection is recorded when earned as a reduction to the cost of inventory. The Company decreases the value of inventory for estimated obsolescence equal to the difference between the cost of inventory and the estimated market value, based upon an aging analysis of the inventory on hand, specifically known inventory-related risks, and assumptions about future demand and market conditions.
Miscellaneous Receivables, Policy	'
	Miscellaneous Receivables
	Miscellaneous receivables generally consist of amounts due from vendors. The Company receives incentives from vendors related to cooperative advertising allowances, volume rebates, bid programs, price protection and other programs. These incentives generally relate to written vendor agreements with specified performance requirements and are recorded as adjustments to cost of sales or inventory, depending on the nature of the incentive.
Property, Plant and Equipment, Policy	'
	Property and Equipment
	Property and equipment are stated at cost. The Company calculates depreciation expense using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized over the shorter of their useful lives or the initial lease term. Expenditures for major renewals and improvements that extend the useful life of property and equipment are capitalized. Expenditures for maintenance and repairs are charged to expense as incurred. The following table shows estimated useful lives of property and equipment:
	Classification	Estimated
		Useful Lives
	Machinery and equipment	5 to 10 years
	Building and leasehold improvements	5 to 25 years
	Computer and data processing equipment	3 to 5 years
	Computer software	3 to 5 years
	Furniture and fixtures	5 to 10 years
Goodwill and Other Intangible Assets, Policy	'
	Goodwill and Other Intangible Assets
	The Company is required to perform an evaluation of goodwill on an annual basis or more frequently if circumstances indicate a potential impairment. The annual test for impairment is conducted as of December 1. The Company’s reporting units used to assess potential goodwill impairment are the same as its operating segments. The Company has the option of performing a qualitative assessment of a reporting unit's fair value from the last quantitative assessment to determine if it is more likely than not that the reporting unit's goodwill is impaired or performing a quantitative assessment by comparing a reporting unit's estimated fair value to its carrying amount. Under the quantitative assessment, testing for impairment of goodwill is a two-step process. The first step compares the fair value of a reporting unit with its carrying amount, including goodwill. If the carrying amount of a reporting unit exceeds its fair value, the second step compares the implied fair value of reporting unit goodwill with the carrying amount of that goodwill to determine the amount of impairment loss. Fair value of a reporting unit is determined by using a weighted combination of an income approach and a market approach, as this combination is considered the most indicative of the Company’s fair value in an orderly transaction between market participants. This assessment uses significant accounting judgments, estimates and assumptions. Any changes in the judgments, estimates or assumptions used could produce significantly different results. During the years ended December 31, 2013, 2012 and 2011, the Company recorded no goodwill impairment charges. See Note 4 for more information on the Company’s evaluations of goodwill for impairment.
	Intangible assets with determinable lives are amortized on a straight-line basis over their respective estimated useful lives. The cost of computer software developed or obtained for internal use is capitalized and amortized on a straight-line basis over the estimated useful life of the software. These intangible assets are reviewed for impairment when indicators are present using undiscounted cash flows. The Company uses the undiscounted cash flows, excluding interest charges, to assess the recoverability of the carrying value of such assets. To the extent carrying value exceeds the undiscounted cash flows, an impairment loss is recorded based upon the excess of the carrying value over fair value. In addition, each quarter, the Company evaluates whether events and circumstances warrant a revision to the remaining estimated useful life of each of these intangible assets. If the Company were to determine that a change to the remaining estimated useful life of an intangible asset was necessary, then the remaining carrying amount of the intangible asset would be amortized prospectively over that revised remaining useful life. During the years ended December 31, 2013, 2012 and 2011, no impairment existed with respect to the Company’s intangible assets with determinable lives and no significant changes to the remaining useful lives were necessary. The following table shows estimated useful lives of definite-lived intangible assets:
	Classification	Estimated
		Useful Lives
	Customer relationships	11 to 14 years
	Trade name	20 years
	Internally developed software	3 to 5 years
	Other	1 to 10 years
Deferred Charges, Policy	'
	Deferred Financing Costs
	Deferred financing costs, such as underwriting, financial advisory, professional fees and other similar fees are capitalized and recognized in interest expense over the estimated life of the related debt instrument using the effective interest method or straight-line method, as applicable.
Derivatives, Policy	'
	Derivatives
	The Company has entered into interest rate cap agreements for the purpose of economically hedging its exposure to fluctuations in interest rates. These derivatives are recorded at fair value in the Company’s consolidated balance sheets.
	The Company’s interest rate cap agreements are not designated as cash flow hedges of interest rate risk. Changes in fair value of the derivatives are recorded directly to interest expense, net in the Company’s consolidated statements of operations.
Fair Value Measurement, Policy	'
	Fair Value Measurements
	Fair value is defined under GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A fair value hierarchy has been established for valuation inputs to prioritize the inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of the three levels which is determined by the lowest level input that is significant to the fair value measurement in its entirety. These levels are:
	Level 1 – observable inputs such as quoted prices for identical instruments traded in active markets.
	Level 2 – inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models and similar techniques.
Accumulated Other Comprehensive Income, Policy	'
	Accumulated Other Comprehensive (Loss) Income
	Foreign currency translation adjustments are included in shareholders’ equity under accumulated other comprehensive (loss) income.
	The components of accumulated other comprehensive (loss) income are as follows:
	(in millions)	December 31,
		2013			2012		2011
	Foreign currency translation adjustment	$	(6.3	)	$	0.4	$	(2.1	)
	Accumulated other comprehensive (loss) income	$	(6.3	)	$	0.4	$	(2.1	)
Revenue Recognition, Policy	'
	Revenue Recognition
	The Company is a primary distribution channel for a large group of vendors and suppliers, including original equipment manufacturers (“OEMs”), software publishers and wholesale distributors. The Company records revenue from sales transactions when title and risk of loss are passed to the customer, there is persuasive evidence of an arrangement for sale, delivery has occurred and/or services have been rendered, the sales price is fixed or determinable, and collectability is reasonably assured. The Company's shipping terms typically specify F.O.B. destination, at which time title and risk of loss have passed to the customer.
	Revenues from the sales of hardware products and software products and licenses are generally recognized on a gross basis with the selling price to the customer recorded as sales and the acquisition cost of the product recorded as cost of sales. These items can be delivered to customers in a variety of ways, including (i) as physical product shipped from the Company's warehouse, (ii) via drop-shipment by the vendor or supplier, or (iii) via electronic delivery for software licenses. At the time of sale, the Company records an estimate for sales returns and allowances based on historical experience. The Company's vendor partners warrant most of the products the Company sells.
	The Company leverages drop-shipment arrangements with many of its vendors and suppliers to deliver products to its customers without having to physically hold the inventory at its warehouses, thereby increasing efficiency and reducing costs. The Company recognizes revenue for drop-shipment arrangements on a gross basis upon delivery to the customer with contract terms that typically specify F.O.B. destination.
	Revenue from professional services is either recognized as provided for services billed at an hourly rate or recognized using a proportional performance model for services provided at a fixed fee. Revenue from cloud computing solutions including Software as a Service ("SaaS") and Infrastructure as a Service ("IaaS") arrangements, as well as data center services such as managed and remote managed services, server co-location, internet connectivity and data backup and storage, is recognized over the period service is provided.
	The Company also sells certain products for which it acts as an agent. Products in this category include the sale of third-party services, warranties, software assurance (“SA”) and third-party hosted SaaS and IaaS arrangements. SA is a product that allows customers to upgrade, at no additional cost, to the latest technology if new applications are introduced during the period that the SA is in effect. These sales do not meet the criteria for gross sales recognition, and thus are recognized on a net basis at the time of sale. Under net sales recognition, the cost paid to the vendor or third-party service provider is recorded as a reduction to sales, resulting in net sales being equal to the gross profit on the transaction.
	The Company's larger customers are offered the opportunity by certain of its vendors to purchase software licenses and SA under enterprise agreements (“EAs”). Under EAs, customers are considered to be compliant with applicable license requirements for the ensuing year, regardless of changes to their employee base. Customers are charged an annual true-up fee for changes in the number of users over the year. With most EAs, the Company's vendors will transfer the license and bill the customer directly, paying resellers such as the Company an agency fee or commission on these sales. The Company records these fees as a component of net sales as earned and there is no corresponding cost of sales amount. In certain instances, the Company bills the customer directly under an EA and accounts for the individual items sold based on the nature of the item. The Company's vendors typically dictate how the EA will be sold to the customer.
	From time to time, the Company sells some of its products and services as part of bundled contract arrangements containing multiple deliverables, which may include a combination of products and services. For each deliverable that represents a separate unit of accounting, total arrangement consideration is allocated based upon the relative selling prices of each element. The allocated arrangement consideration is recognized as revenue in accordance with the principles described above. Selling prices are determined by using vendor specific objective evidence (“VSOE”) if it exists. Otherwise, selling prices are determined using third party evidence (“TPE”). If neither VSOE or TPE is available, the Company uses its best estimate of selling prices.
	The Company records freight billed to its customers as net sales and the related freight costs as a cost of sales.
	Deferred revenue includes (1) payments received from customers in advance of providing the product or performing services, and (2) amounts deferred if other conditions of revenue recognition have not been met.
	The Company performs an analysis of the estimated number of days of sales in-transit to customers at the end of each period based on a weighted-average analysis of commercial delivery terms that includes drop-shipment arrangements. This analysis is the basis upon which the Company estimates the amount of sales in-transit at the end of the period and adjusts revenue and the related costs to reflect only what has been received by the customer. Changes in delivery patterns may result in a different number of business days used in making this adjustment and could have a material impact on the Company's revenue recognition for the period.
Sales Tax, Policy	'
	Sales Taxes
	Sales tax amounts collected from customers for remittance to governmental authorities are presented on a net basis in the Company’s consolidated statements of operations.
Advertising Cost, Policy	'
	Advertising
	Advertising costs are generally charged to expense in the period incurred. Cooperative reimbursements from vendors are recorded in the period the related advertising expenditure is incurred. The Company classifies vendor consideration as a reduction to cost of sales.
Equity-based Compensation, Policy	'
	Equity-Based Compensation
	The Company measures all equity-based payments using a fair-value-based method and records compensation expense over the requisite service period in its consolidated financial statements. Forfeiture rates have been developed based upon historical experience.
Interest Expense, Policy	'
	Interest Expense
	Interest expense is typically recognized in the period incurred at the applicable interest rate in effect. For increasing-rate debt, the Company determines the periodic interest cost using the effective interest method over the estimated outstanding term of the debt. The difference between interest expense recorded and cash interest paid is reflected as short-term or long-term accrued interest in the Company’s consolidated balance sheets.
Foreign Currency Translation, Policy	'
	Foreign Currency Translation
	The Company’s functional currency is the U.S. dollar. The functional currency of the Company’s Canadian subsidiary is the local currency, the Canadian dollar. Assets and liabilities of this subsidiary are translated at the spot rate in effect at the applicable reporting date and the consolidated results of operations are translated at the average exchange rates in effect during the applicable period. The resulting foreign currency translation adjustment is recorded as accumulated other comprehensive (loss) income, which is reflected as a separate component of shareholders’ equity.
Income Tax, Policy	'
	Income Taxes
	Deferred income taxes are provided to reflect the differences between the tax bases of assets and liabilities and their reported amounts in the consolidated financial statements using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company performs an evaluation of the realizability of deferred tax assets on a quarterly basis. This evaluation requires management to make use of estimates and assumptions and considers all positive and negative evidence and factors, such as the scheduled reversal of temporary differences, the mix of earnings in the jurisdictions in which the Company operates, and prudent and feasible tax planning strategies.
	The Company accounts for unrecognized tax benefits based upon its assessment of whether a tax benefit is more likely than not to be sustained upon examination by tax authorities. The Company reports a liability for unrecognized tax benefits resulting from unrecognized tax benefits taken or expected to be taken in a tax return and recognizes interest and penalties, if any, related to its unrecognized tax benefits in income tax expense.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements Recent Accounting Pronouncements (Policies)	12 Months Ended
	Dec. 31, 2013
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
New Accounting Pronouncements, Policy [Policy Text Block]	'
	Recent Accounting Pronouncements
	Disclosure of the Effects of Reclassifications from Accumulated Other Comprehensive Income
	In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update 2013-02, which required that the effects of significant reclassifications from accumulated other comprehensive income to net income be shown parenthetically on the face of the consolidated financial statements or disclosed in a note. The adoption of this new guidance on January 1, 2013 did not have an impact on the Company's consolidated financial position, results of operations or cash flows.

Description_Of_Business_And_Su2

Description Of Business And Summary Of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Loss [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The components of accumulated other comprehensive (loss) income are as follows:
	(in millions)	December 31,
		2013			2012		2011
	Foreign currency translation adjustment	$	(6.3	)	$	0.4	$	(2.1	)
	Accumulated other comprehensive (loss) income	$	(6.3	)	$	0.4	$	(2.1	)
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
	The following table shows estimated useful lives of definite-lived intangible assets:
	Classification	Estimated
		Useful Lives
	Customer relationships	11 to 14 years
	Trade name	20 years
	Internally developed software	3 to 5 years
	Other	1 to 10 years
	The following table presents a summary of intangible assets at December 31, 2013 and 2012:
	(in millions)
	December 31, 2013	Gross			Accumulated		Net Carrying Amount
		Carrying			Amortization
		Amount
	Customer relationships	$	1,860.80		$	872.8	$	988
	Trade name	421			130.9		290.1
	Internally developed software	128.5			79.8		48.7
	Other	3.1			1.9		1.2
	Total	$	2,413.40		$	1,085.40	$	1,328.00
	December 31, 2012
	Customer relationships	$	1,861.70		$	733.3	$	1,128.40
	Trade name	421			109.9		311.1
	Internally developed software	97.4			60.1		37.3
	Other	3.3			1.6		1.7
	Total	$	2,383.40		$	904.9	$	1,478.50
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	The following table shows estimated useful lives of property and equipment:
	Classification	Estimated
		Useful Lives
	Machinery and equipment	5 to 10 years
	Building and leasehold improvements	5 to 25 years
	Computer and data processing equipment	3 to 5 years
	Computer software	3 to 5 years
	Furniture and fixtures	5 to 10 years
	Property and equipment consisted of the following:
	(in millions)	December 31,
		2013			2012
	Land	$	27.7		$	27.7
	Machinery and equipment	53			50.9
	Building and leasehold improvements	104.8			104
	Computer and data processing equipment	61.2			56.4
	Computer software	30.9			30.2
	Furniture and fixtures	21.6			21.6
	Construction in progress	10.9			11.9
	Total property and equipment	310.1			302.7
	Less accumulated depreciation	179			160
	Net property and equipment	$	131.1		$	142.7

Property_And_Equipment_Tables

Property And Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	The following table shows estimated useful lives of property and equipment:
	Classification	Estimated
		Useful Lives
	Machinery and equipment	5 to 10 years
	Building and leasehold improvements	5 to 25 years
	Computer and data processing equipment	3 to 5 years
	Computer software	3 to 5 years
	Furniture and fixtures	5 to 10 years
	Property and equipment consisted of the following:
	(in millions)	December 31,
		2013		2012
	Land	$	27.7	$	27.7
	Machinery and equipment	53		50.9
	Building and leasehold improvements	104.8		104
	Computer and data processing equipment	61.2		56.4
	Computer software	30.9		30.2
	Furniture and fixtures	21.6		21.6
	Construction in progress	10.9		11.9
	Total property and equipment	310.1		302.7
	Less accumulated depreciation	179		160
	Net property and equipment	$	131.1	$	142.7

Goodwill_And_Other_Intangible_1

Goodwill And Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill [Table Text Block]	'
	The following table presents the change in goodwill by segment for the years ended December 31, 2013 and 2012:
	(in millions)	Corporate			Public			Other (1)			Consolidated
	Balances as of December 31, 2011:
	Goodwill	$	2,794.40		$	1,261.40		$	106.4		$	4,162.20
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,223.00		$	907.3		$	78.1		$	2,208.40
	2012 Activity:
	Translation adjustment	$	—		$	—		$	0.9		$	0.9
		$	—		$	—		$	0.9		$	0.9
	Balances as of December 31, 2012:
	Goodwill	$	2,794.40		$	1,261.40		$	107.3		$	4,163.10
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,223.00		$	907.3		$	79		$	2,209.30
	2013 Activity:
	Translation adjustment	$	—		$	—		$	(2.1	)	$	(2.1	)
	Contingent consideration (2)	8.8			4			0.3			13.1
		$	8.8		$	4		$	(1.8	)	$	11
	Balances as of December 31, 2013:
	Goodwill	$	2,803.20		$	1,265.40		$	105.5		$	4,174.10
	Accumulated impairment charges	(1,571.4		)	(354.1		)	(28.3		)	(1,953.8		)
		$	1,231.80		$	911.3		$	77.2		$	2,220.30
	(1)Other is comprised of CDW Advanced Services and Canada reporting units.
	-2	During 2013, the Company recorded a $13.1 million net-of-tax addition to goodwill in connection with the settlement of the MPK Coworker Incentive Plan II and related charitable contribution. The charitable contribution was accounted for as additional purchase price (goodwill) in accordance with pre-2009 business combinations accounting guidance. See Note 10 for additional discussion of this transaction.
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
	The following table shows estimated useful lives of definite-lived intangible assets:
	Classification	Estimated
		Useful Lives
	Customer relationships	11 to 14 years
	Trade name	20 years
	Internally developed software	3 to 5 years
	Other	1 to 10 years
	The following table presents a summary of intangible assets at December 31, 2013 and 2012:
	(in millions)
	December 31, 2013	Gross			Accumulated			Net Carrying Amount
		Carrying			Amortization
		Amount
	Customer relationships	$	1,860.80		$	872.8		$	988
	Trade name	421			130.9			290.1
	Internally developed software	128.5			79.8			48.7
	Other	3.1			1.9			1.2
	Total	$	2,413.40		$	1,085.40		$	1,328.00
	December 31, 2012
	Customer relationships	$	1,861.70		$	733.3		$	1,128.40
	Trade name	421			109.9			311.1
	Internally developed software	97.4			60.1			37.3
	Other	3.3			1.6			1.7
	Total	$	2,383.40		$	904.9		$	1,478.50
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	Estimated future amortization expense related to intangible assets for the next five years is as follows:
	(in millions)
	Years ending December 31,
	2014	$	179
	2015	171.7
	2016	163.9
	2017	161.5
	2018	161.3

Inventory_Financing_Agreements1

Inventory Financing Agreements (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Financing Agreements [Abstract]	'
Inventory Financing Agreements [Table Text Block]	'
	The following table presents the amounts included in accounts payable-inventory financing:
	(in millions)	December 31,
		2013		2012
	Revolving Loan inventory financing agreement	$	256.1	$	248.3
	Other inventory financing agreements	0.5		0.9
	Accounts payable-inventory financing	$	256.6	$	249.2

Lease_Commitments_Tables

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
Operating Leases of Lessee Disclosure [Table Text Block]	'
	Future minimum lease payments are as follows:
	(in millions)
	Years ending December 31,
	2014	$	17.9
	2015	17.7
	2016	13.2
	2017	10.7
	2018	9
	Thereafter	20.7
	Total future minimum lease payments	$	89.2

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]	'
Carrying Value of Long-Term Debt	'
	Long-term debt was as follows:
	(dollars in millions)				December 31,
		Interest Rate (1)			2013				2012
	Senior secured asset-based revolving credit facility	—	%		$	—			$	—
	Senior secured term loan facility	3.25	%		1,528.90				1,339.50
	Unamortized discount on senior secured term loan facility				(4.4		)		—
	Senior secured notes due 2018	8	%		325				500
	Senior notes due 2019	8.5	%		1,305.00				1,305.00
	Unamortized premium on senior notes due 2019				4.2				5
	Senior subordinated notes due 2017	12.535	%		92.5				621.5
	Total long-term debt				3,251.20				3,771.00
	Less current maturities of long-term debt				(45.4		)		(40.0		)
	Long-term debt, excluding current maturities				$	3,205.80			$	3,731.00
	(1)Interest rate at December 31, 2013.
Schedule of Long-term Debt Maturities	'
	As of December 31, 2013, the maturities of long-term debt were as follows:
	(in millions)
	Years ending December 31,
	2014	$	45.4
	2015	15.4
	2016	15.4
	2017	77.9
	2018	340.4
	Thereafter	2,756.90
		$	3,251.40
Deferred Financing Costs Disclosure	'
	The following table summarizes the deferred financing costs activity for the years ended December 31, 2013 and 2012:
	(in millions)	December 31,
		2013				2012
	Beginning balance	$	53.2			$	68.5
	Additional costs capitalized	6.1				2.1
	Recognized in interest expense	(9.1		)		(14.4		)
	Write-off of unamortized deferred financing costs	(20.1		)		(3.0		)
	Ending balance	$	30.1			$	53.2

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	'
	Income before income taxes was taxed under the following jurisdictions:
	(in millions)	Years Ended December 31,
		2013			2012				2011
	Domestic	$	179.4		$	170.3			$	11.4
	Foreign	16.1			15.8				16.9
	Total	$	195.5		$	186.1			$	28.3
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	Components of the income tax expense (benefit) consisted of the following:
	(in millions)	Years Ended December 31,
		2013			2012				2011
	Current:
	Federal	$	96.7		$	110.3			$	17.9
	State	10.1			8				(0.6		)
	Foreign	4.6			5.1				4.1
	Total current	111.4			123.4				21.4
	Deferred:
	Domestic	(48.6		)	(56.2		)		(9.9		)
	Foreign	(0.1		)	(0.1		)		(0.3		)
	Total deferred	(48.7		)	(56.3		)		(10.2		)
	Income tax expense	$	62.7		$	67.1			$	11.2
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	'
	The reconciliation between the statutory tax rate expressed as a percentage of income before income taxes and the effective tax rate is as follows:
	(dollars in millions)	Years Ended December 31,
		2013						2012						2011
	Statutory federal income tax rate	$	68.4		35	%		$	65.1			35	%	$	9.9		35	%
	State taxes, net of federal effect	(5.0		)	(2.6	)		0.4				0.2		(3.4		)	(11.8	)
	Equity-based compensation	1.5			0.7			5.7				3.1		5.1			17.9
	Effect of rates different than statutory	(1.4		)	(0.7	)		(1.4		)		(0.8	)	(1.1		)	(4.0	)
	Valuation allowance	—			—			—				—		(0.9		)	(3.1	)
	Other	(0.8		)	(0.3	)		(2.7		)		(1.5	)	1.6			5.7
	Effective tax rate	$	62.7		32.1	%		$	67.1			36	%	$	11.2		39.7	%
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	'
	The tax effect of temporary differences that give rise to the net deferred income tax liability is presented below:
	(in millions)	December 31,
		2013			2012
	Deferred Tax Assets:
	Deferred interest	$	42.5		$	58.3
	State net operating loss and credit carryforwards, net	20.6			18
	Payroll and benefits	16.2			16.7
	Rent	6.4			1.2
	Accounts receivable	5.4			4.2
	Equity compensation plans	1.6			10.3
	Trade credits	1.5			1.8
	Interest rate caps	0.8			1.8
	Charitable contribution carryforward	0.5			4.1
	Deferred financing costs	0.2			2.3
	Other	7.1			7.2
	Total deferred tax assets	102.8			125.9
	Deferred Tax Liabilities:
	Software and intangibles	486.2			551.4
	Deferred income	145.5			146.3
	Property and equipment	25			29.3
	Other	11.6			9.1
	Total deferred tax liabilities	668.3			736.1
	Deferred tax asset valuation allowance	—			—
	Net deferred tax liability	$	565.5		$	610.2

Shareholders_Equity_Tables

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
IPO-related expenses [Abstract]	'
IPO- and secondary-offering related expenses [Table Text Block]	'
	The following pre-tax IPO- and secondary-offering related expenses were included within selling and administrative expenses in the consolidated statement of operations for the year ended December 31, 2013:
	(in millions)	Year Ended December 31, 2013
	Acceleration charge for certain equity awards and related employer payroll taxes(1)	$	40.7
	RDU Plan cash retention pool accrual(2)	7.5
	Management services agreement termination fee(3)	24.4
	Other expenses	2.4
	IPO- and secondary-offering related expenses	$	75
	(1)See Note 10 for additional discussion of the impact of the IPO on the Company's equity awards.
	(2)See Note 12 for additional discussion of this transaction.
	(3)Represents the payment of a termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities.

EquityBased_Compensation_Table

Equity-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Share-based Arrangements with Employees and Nonemployees [Abstract]	'
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	'
	The assumptions used to value the stock options granted during the year ended December 31, 2013 are presented below.
		Year Ended December 31,
	Assumptions	2013
	Weighted-average grant date fair value	$	4.75
	Weighted-average volatility (1)	35		%
	Weighted-average risk-free rate (2)	1.58		%
	Dividend yield	1		%
	Expected term (in years) (3)	5.4
	-1	Based upon an assessment of the two-year, five-year and implied volatility for the Company’s selected peer group, adjusted for the Company’s leverage.
	-2	Based on a composite U.S. Treasury rate.
	-3	The expected term is calculated using the simplified method. The simplified method defines the expected term as the average of the option’s contractual term and the option’s weighted-average vesting period. The Company utilizes this method as it has limited historical stock option data that is sufficient to derive a reasonable estimate of the expected stock option term.
Schedule of Stock Options Roll Forward [Table Text Block]	'
	The following table sets forth a summary of the Company's stock option activity for the year ended December 31, 2013:
	Options	Number of Options		Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value (millions)
	Outstanding at January 1, 2013	—		$	—
	Granted	1,288,398		$	17
	Forfeited/Expired	(8,143	)	$	17
	Exercised	—		$	—			N/A
	Outstanding at December 31, 2013	1,280,255		$	17		8.4	$	8.1
	Vested at December 31, 2013	393,517		$	17		8	$	2.5
	Exercisable at December 31, 2013	393,517		$	17		8	$	2.5
	Expected to vest at December 31, 2013	852,713		$	17		8.6	$	5.4
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]	'
	The following table sets forth a summary of the Company's RSU activity for the year ended December 31, 2013:
		Number of Units		Weighted-Average Grant-Date Fair Value
	Nonvested at January 1, 2013	—		$	—
	Granted	1,416,543		17.03
	Vested/Settled	(1,844	)	17
	Forfeited	(63,127	)	17.01
	Nonvested at December 31, 2013	1,351,572		$	17.04
Schedule of Share-based Payment Award, Equity Investments other than Options, Valuation Assumptions [Table Text Block]	'
	The following table summarizes the assumptions and resulting fair value of the Class B Common Unit grants for the years ended December 31, 2013, 2012 and 2011:
		Class B Common Units
		Years Ended December 31,
	Assumptions	2013				2012				2011
	Weighted-average grant date fair value	$	119			$	125.65			$	148.89
	Weighted-average volatility	65.5		%		65.26		%		82.87		%
	Weighted-average risk-free rate	0.18		%		0.19		%		0.84		%
	Dividend yield	0		%		0		%		0		%
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	'
	The following table sets forth a summary of equity plan activity for the year ended December 31, 2013:
		Class B				MPK Plan
		Common Units				Units
	Outstanding at January 1, 2013	216,483				66,137
	Granted	400				—
	Forfeited	(860	)			(2,228	)
	Converted/Settled (1)	(216,023	)			(63,909	)
	Outstanding at December 31, 2013	—				—
	Vested at December 31, 2013	—				—

Earnings_per_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Weighted Average Number of Shares [Table Text Block]	'
	The following is a reconciliation of basic shares to diluted shares:
		Years Ended December 31,
	(in millions)	2013	2012	2011
	Weighted-average shares - basic	156.6	145.1	144.8
	Effect of dilutive securities	2.1	0.7	0.1
	Weighted-average shares - diluted	158.7	145.8	144.9

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Revenue from External Customers by Products and Services [Table Text Block]	'
	The following table presents net sales by major category for the years ended December 31, 2013, 2012 and 2011. Categories are based upon internal classifications. Amounts for the years ended December 31, 2012 and 2011 have been reclassified for certain changes in individual product classifications to conform to the presentation for the year ended December 31, 2013.
		Year Ended						Year Ended							Year Ended
		December 31, 2013						December 31, 2012							December 31, 2011
		Dollars in			Percentage			Dollars in				Percentage			Dollars in				Percentage
		Millions			of Total Net			Millions				of Total Net			Millions				of Total Net
					Sales							Sales							Sales
	Notebooks/Mobile Devices	$	1,706.00		15.8	%		$	1,470.10			14.5	%		$	1,336.90			13.9	%
	NetComm Products	1,489.10			13.8			1,351.10				13.3			1,237.70				12.9
	Enterprise and Data Storage (Including Drives)	998.1			9.3			979.4				9.7			929.9				9.7
	Other Hardware	4,173.30			38.8			4,068.80				40.2			3,988.30				41.5
	Software	1,994.70			18.5			1,849.40				18.3			1,767.20				18.4
	Services	327.1			3			284.6				2.8			254.3				2.6
	Other (1)	80.3			0.8			124.8				1.2			88.1				1
	Total net sales	$	10,768.60		100	%		$	10,128.20			100	%		$	9,602.40			100	%
	-1	Includes items such as delivery charges to customers and certain commission revenue.
Schedule of Segment Reporting Information, by Segment [Table Text Block]	'
	The following table presents information about the Company’s segments for the years ended December 31, 2013, 2012 and 2011:
	(in millions)	Corporate			Public				Other				Headquarters				Total
	2013:00:00
	Net sales	$	5,960.10		$	4,164.50			$	644			$	—			$	10,768.60
	Income (loss) from operations	363.3			246.5				27.2				(128.4		)		508.6
	Depreciation and amortization expense	(97.3		)	(44.0		)		(8.6		)		(58.3		)		(208.2		)
	IPO- and secondary-offering related expenses	(26.4		)	(14.4		)		(3.6		)		(30.6		)		(75.0		)
	2012:00:00
	Net sales	$	5,512.80		$	4,023.00			$	592.4			$	—			$	10,128.20
	Income (loss) from operations	349			246.7				18.6				(103.7		)		510.6
	Depreciation and amortization expense	(97.6		)	(44.0		)		(9.3		)		(59.3		)		(210.2		)
	IPO- and secondary-offering related expenses	—			—				—				—				—
	2011:00:00
	Net sales	$	5,334.40		$	3,757.20			$	510.8			$	—			$	9,602.40
	Income (loss) from operations	331.6			233.3				17.5				(111.7		)		470.7
	Depreciation and amortization expense	(97.4		)	(43.9		)		(8.7		)		(54.9		)		(204.9		)
	IPO- and secondary-offering related expenses	—			—				—				—				—

Supplemental_Guarantor_Informa1

Supplemental Guarantor Information (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Guarantor Information [Abstract]	'
Schedule of Condensed Cash Flow Statement [Table Text Block]	'
	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2013
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net cash (used in) provided by operating activities	$	(15.2	)	$	(130.3	)	$	508.8		$	5.5		$	—	$	(2.5	)	$	366.3
	Cash flows from investing activities:
	Capital expenditures	—			(40.8		)	(6.2		)	(0.1		)	—		—			(47.1		)
	Net cash used in investing activities	—			(40.8		)	(6.2		)	(0.1		)	—		—			(47.1		)
	Cash flows from financing activities:
	Proceeds from borrowings under revolving credit facility	—			63			—			—			—		—			63
	Repayments of borrowings under revolving credit facility	—			(63.0		)	—			—			—		—			(63.0		)
	Repayments of long-term debt	—			(51.1		)	—			—			—		—			(51.1		)
	Proceeds from issuance of long-term debt	—			1,535.20			—			—			—		—			1,535.20
	Payments to extinguish long-term debt	—			(2,047.4		)	—			—			—		—			(2,047.4		)
	Payment of debt financing costs	—			(6.1		)	—			—			—		—			(6.1		)
	Net change in accounts payable-inventory financing	—			—			7.4			—			—		—			7.4
	Payment of incentive compensation plan withholding taxes	—			(4.0		)	(19.6		)	(0.5		)	—		—			(24.1		)
	Net proceeds from issuance of common shares	424.7			—			—			—			—		—			424.7
	Dividends paid	(7.3		)	—			—			—			—		—			(7.3		)
	Advances to/from affiliates	(402.2		)	892.6			(490.4		)	—			—		—			—
	Other financing activities	—			0.4			—			—			—		—			0.4
	Net cash provided by (used in) financing activities	15.2			319.6			(502.6		)	(0.5		)	—		—			(168.3		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			(0.7		)	—		—			(0.7		)
	Net increase in cash and cash equivalents	—			148.5			—			4.2			—		(2.5		)	150.2
	Cash and cash equivalents – beginning of period	—			48			—			9.8			—		(19.9		)	37.9
	Cash and cash equivalents – end of period	$	—		$	196.5		$	—		$	14		$	—	$	(22.4	)	$	188.1
	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2011
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net cash (used in) provided by operating activities	$	—		$	(93.8	)	$	327.5		$	(0.3	)	$	—	$	(18.7	)	$	214.7
	Cash flows from investing activities:
	Capital expenditures	—			(33.4		)	(10.6		)	(1.7		)	—		—			(45.7		)
	Cash settlements on interest rate swap agreements	—			(6.6		)	—			—			—		—			(6.6		)
	Premium payments on interest rate cap agreements	—			(3.7		)	—			—			—		—			(3.7		)
	Net cash used in investing activities	—			(43.7		)	(10.6		)	(1.7		)	—		—			(56.0		)
	Cash flows from financing activities:
	Proceeds from borrowings under revolving credit facility	—			1,295.00			—			—			—		—			1,295.00
	Repayments of borrowings under revolving credit facility	—			(1,483.2		)	—			—			—		—			(1,483.2		)
	Repayments of long-term debt	—			(132.0		)	—			—			—		—			(132.0		)
	Proceeds from issuance of long-term debt	—			1,175.00			—			—			—		—			1,175.00
	Payments to extinguish long-term debt	—			(1,175.0		)	—			—			—		—			(1,175.0		)
	Payment of debt financing costs	—			(26.3		)	—			—			—		—			(26.3		)
	Net change in accounts payable-inventory financing	—			—			250.5			—			—		—			250.5
	Advances to/from affiliates	—			552.6			(552.7		)	0.1			—		—			—
	Other financing activities	—			0.6			—			—			—		—			0.6
	Net cash provided by (used in) financing activities	—			206.7			(302.2		)	0.1			—		—			(95.4		)
	Effect of exchange rate changes on cash and cash equivalents	—			—			—			—			—		—			—
	Net increase (decrease) in cash and cash equivalents	—			69.2			14.7			(1.9		)	—		(18.7		)	63.3
	Cash and cash equivalents – beginning of period	—			32.9			1.1			10			—		(7.4		)	36.6
	Cash and cash equivalents – end of period	$	—		$	102.1		$	15.8		$	8.1		$	—	$	(26.1	)	$	99.9
	Condensed Consolidating Statement of Cash Flows
	Year Ended December 31, 2012
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net cash (used in) provided by operating activities	$	—		$	(204.3	)	$	514.2		$	1.3		$	—	$	6.2		$	317.4
	Cash flows from investing activities:
	Capital expenditures	—			(27.0		)	(14.0		)	(0.4		)	—		—			(41.4		)
	Premium payments on interest rate cap agreements	—			(0.3		)	—			—			—		—			(0.3		)
	Net cash used in investing activities	—			(27.3		)	(14.0		)	(0.4		)	—		—			(41.7		)
	Cash flows from financing activities:
	Proceeds from borrowings under revolving credit facility	—			289			—			—			—		—			289
	Repayments of borrowings under revolving credit facility	—			(289.0		)	—			—			—		—			(289.0		)
Repayments of long-term debt	—			(201.0		)	—			—			—		—			(201.0		)
Proceeds from issuance of long-term debt	—			135.7			—			—			—		—			135.7
Payments to extinguish long-term debt	—			(243.2		)	—			—			—		—			(243.2		)
Payment of debt financing costs	—			(2.1		)	—			—			—		—			(2.1		)
Net change in accounts payable-inventory financing	—			—			(29.5		)	—			—		—			(29.5		)
Advances to/from affiliates	—			486			(486.5		)	0.5			—		—			—
Other financing activities	—			2.1			—			—			—		—			2.1
Net cash provided by (used in) financing activities	—			177.5			(516.0		)	0.5			—		—			(338.0		)
Effect of exchange rate changes on cash and cash equivalents	—			—			—			0.3			—		—			0.3
Net (decrease) increase in cash and cash equivalents	—			(54.1		)	(15.8		)	1.7			—		6.2			(62.0		)
Cash and cash equivalents – beginning of period	—			102.1			15.8			8.1			—		(26.1		)	99.9
Cash and cash equivalents – end of period	$	—		$	48		$	—		$	9.8		$	—	$	(19.9	)	$	37.9
Schedule of Condensed Comprehensive Income (Loss) [Table Text Block]	'
	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2013
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Comprehensive income	$	126.1		$	141.3		$	409		$	4.8		$	—	$	(555.1	)	$	126.1
	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2011
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Comprehensive income	$	17.2		$	17.2		$	343.7		$	2		$	—	$	(362.9	)	$	17.2
	Condensed Consolidating Statement of Comprehensive Income
	Year Ended December 31, 2012
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Comprehensive income	$	121.5		$	121.5		$	322.8		$	13.2		$	—	$	(457.5	)	$	121.5
Schedule of Condensed Balance Sheet [Table Text Block]	'
	Condensed Consolidating Balance Sheet
	December 31, 2012
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Assets
	Current assets:
	Cash and cash equivalents	$	—		$	48		$	—		$	9.8		$	—	$	(19.9	)	$	37.9
	Accounts receivable, net	—			—			1,217.70			67.3			—		—			1,285.00
	Merchandise inventory	—			—			313.2			1.4			—		—			314.6
	Miscellaneous receivables	—			61.7			82			4.8			—		—			148.5
	Deferred income taxes	—			8.7			5.5			(0.1		)	—		—			14.1
	Prepaid expenses and other	—			10.1			24.4			0.1			—		—			34.6
	Total current assets	—			128.5			1,642.80			83.3			—		(19.9		)	1,834.70
	Property and equipment, net	—			73.9			66.2			2.6			—		—			142.7
	Goodwill	—			749.4			1,428.50			31.4			—		—			2,209.30
	Other intangible assets, net	—			348.6			1,121.70			8.2			—		—			1,478.50
	Deferred financing costs, net	—			53.2			—			—			—		—			53.2
	Other assets	5.4			1.1			0.4			0.6			—		(5.9		)	1.6
	Investment in and advances to subsidiaries	131.1			2,946.00			—			—			—		(3,077.1		)	—
	Total assets	$	136.5		$	4,300.70		$	4,259.60		$	126.1		$	—	$	(3,102.9	)	$	5,720.00
	Liabilities and Shareholders' Equity
	Current liabilities:
	Accounts payable-trade	$	—		$	16.5		$	500.3		$	21.7		$	—	$	(19.9	)	$	518.6
	Accounts payable-inventory financing	—			—			249.2			—			—		—			249.2
	Current maturities of long-term debt	—			40			—			—			—		—			40
	Deferred revenue	—			—			57.8			—			—		—			57.8
	Accrued expenses	—			139.3			157.4			5.9			—		—			302.6
	Total current liabilities	—			195.8			964.7			27.6			—		(19.9		)	1,168.20
	Long-term liabilities:
	Debt	—			3,731.00			—			—			—		—			3,731.00
	Deferred income taxes	—			188.1			440			1.7			—		(5.5		)	624.3
	Accrued interest	—			8			—			—			—		—			8
	Other liabilities	—			46.7			4			1.7			—		(0.4		)	52
	Total long-term liabilities	—			3,973.80			444			3.4			—		(5.9		)	4,415.30
	Total shareholders’ equity	136.5			131.1			2,850.90			95.1			—		(3,077.1		)	136.5
	Total liabilities and shareholders’ equity	$	136.5		$	4,300.70		$	4,259.60		$	126.1		$	—	$	(3,102.9	)	$	5,720.00
	Condensed Consolidating Balance Sheet
	December 31, 2013
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Assets
	Current assets:
	Cash and cash equivalents	$	—		$	196.5		$	—		$	14		$	—	$	(22.4	)	$	188.1
	Accounts receivable, net	—			—			1,375.90			75.1			—		—			1,451.00
	Merchandise inventory	—			—			378.9			3.1			—		—			382
	Miscellaneous receivables	—			49.9			91			5.4			—		—			146.3
	Prepaid expenses and other	—			10.7			33.4			5.1			—		(3.1		)	46.1
	Total current assets	—			257.1			1,879.20			102.7			—		(25.5		)	2,213.50
	Property and equipment, net	—			69.7			59.6			1.8			—		—			131.1
	Goodwill	—			751.9			1,439.00			29.4			—		—			2,220.30
	Other intangible assets, net	—			338.5			982.8			6.7			—		—			1,328.00
	Deferred financing costs, net	—			30.1			—			—			—		—			30.1
	Other assets	4.9			1.4			0.1			0.9			—		(5.7		)	1.6
	Investment in and advances to subsidiaries	706.8			2,909.40			—			—			—		(3,616.2		)	—
	Total assets	$	711.7		$	4,358.10		$	4,360.70		$	141.5		$	—	$	(3,647.4	)	$	5,924.60
	Liabilities and Shareholders’ Equity
	Current liabilities:
	Accounts payable-trade	$	—		$	21.4		$	637.3		$	26.5		$	—	$	(22.4	)	$	662.8
	Accounts payable-inventory financing	—			—			256.6			—			—		—			256.6
	Current maturities of long-term debt	—			45.4			—			—			—		—			45.4
	Deferred revenue	—			—			89.9			4.9			—		—			94.8
	Accrued expenses	—			163.5			175.1			7.5			—		(3.1		)	343
	Total current liabilities	—			230.3			1,158.90			38.9			—		(25.5		)	1,402.60
Long-term liabilities:
Debt	—			3,205.80			—			—			—		—			3,205.80
Deferred income taxes	—			178.3			388.4			1.6			—		(4.8		)	563.5
Other liabilities	—			36.9			3.6			1.4			—		(0.9		)	41
Total long-term liabilities	—			3,421.00			392			3			—		(5.7		)	3,810.30
Total shareholders’ equity	711.7			706.8			2,809.80			99.6			—		(3,616.2		)	711.7
Total liabilities and shareholders' equity	$	711.7		$	4,358.10		$	4,360.70		$	141.5		$	—	$	(3,647.4	)	$	5,924.60
Schedule of Condensed Income Statement [Table Text Block]	'
	Consolidating Statement of Operations
	Year Ended December 31, 2013
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net sales	$	—		$	—		$	10,293.30		$	475.3		$	—	$	—		$	10,768.60
	Cost of sales	—			—			8,592.10			416.2			—		—			9,008.30
	Gross profit	—			—			1,701.20			59.1			—		—			1,760.30
	Selling and administrative expenses	24.4			103.9			957.3			35.3			—		—			1,120.90
	Advertising expense	—			—			126.8			4			—		—			130.8
	(Loss) income from operations	(24.4		)	(103.9		)	617.1			19.8			—		—			508.6
	Interest (expense) income, net	—			(250.6		)	0.2			0.3			—		—			(250.1		)
	Net loss on extinguishments of long-term debt	—			(64.0		)	—			—			—		—			(64.0		)
	Management fee	—			4.3			—			(4.3		)	—		—			—
	Other (expense) income, net	—			(0.5		)	1.2			0.3			—		—			1
	(Loss) income before income taxes	(24.4		)	(414.7		)	618.5			16.1			—		—			195.5
	Income tax benefit (expense)	9.2			142.2			(209.5		)	(4.6		)	—		—			(62.7		)
	(Loss) income before equity in earnings of subsidiaries	(15.2		)	(272.5		)	409			11.5			—		—			132.8
	Equity in earnings of subsidiaries	148			420.5			—			—			—		(568.5		)	—
	Net income	$	132.8		$	148		$	409		$	11.5		$	—	$	(568.5	)	$	132.8
	Consolidating Statement of Operations
	Year Ended December 31, 2011
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net sales	$	—		$	—		$	9,222.40		$	380		$	—	$	—		$	9,602.40
	Cost of sales	—			—			7,688.80			330.1			—		—			8,018.90
	Gross profit	—			—			1,533.60			49.9			—		—			1,583.50
	Selling and administrative expenses	—			111.7			849.2			29.2			—		—			990.1
	Advertising expense	—			—			119			3.7			—		—			122.7
	(Loss) income from operations	—			(111.7		)	565.4			17			—		—			470.7
	Interest (expense) income, net	—			(324.5		)	0.2			0.1			—		—			(324.2		)
	Net loss on extinguishments of long-term debt	—			(118.9		)	—			—			—		—			(118.9		)
	Management fee	—			9.2			—			(9.2		)	—		—			—
	Other income (expense), net	—			0.4			0.5			(0.2		)	—		—			0.7
	(Loss) income before income taxes	—			(545.5		)	566.1			7.7			—		—			28.3
	Income tax benefit (expense)	—			215.1			(222.4		)	(3.9		)	—		—			(11.2		)
	(Loss) income before equity in earnings of subsidiaries	—			(330.4		)	343.7			3.8			—		—			17.1
	Equity in earnings of subsidiaries	17.1			347.5			—			—			—		(364.6		)	—
	Net income	$	17.1		$	17.1		$	343.7		$	3.8		$	—	$	(364.6	)	$	17.1
	Consolidating Statement of Operations
	Year Ended December 31, 2012
	(in millions)	Parent			Subsidiary			Guarantor			Non-Guarantor			Co-Issuer		Consolidating			Consolidated
		Guarantor			Issuer			Subsidiaries			Subsidiary					Adjustments
	Net sales	$	—		$	—		$	9,683.00		$	445.2		$	—	$	—		$	10,128.20
	Cost of sales	—			—			8,071.50			387.1			—		—			8,458.60
	Gross profit	—			—			1,611.50			58.1			—		—			1,669.60
	Selling and administrative expenses	—			103.7			891.6			34.2			—		—			1,029.50
	Advertising expense	—			—			125.1			4.4			—		—			129.5
	(Loss) income from operations	—			(103.7		)	594.8			19.5			—		—			510.6
	Interest (expense) income, net	—			(308.0		)	0.4			0.2			—		—			(307.4		)
	Net loss on extinguishments of long-term debt	—			(17.2		)	—			—			—		—			(17.2		)
	Management fee	—			3.8			—			(3.8		)	—		—			—
	Other income (expense), net	—			—			0.2			(0.1		)	—		—			0.1
	(Loss) income before income taxes	—			(425.1		)	595.4			15.8			—		—			186.1
	Income tax benefit (expense)	—			210.6			(272.6		)	(5.1		)	—		—			(67.1		)
	(Loss) income before equity in earnings of subsidiaries	—			(214.5		)	322.8			10.7			—		—			119
	Equity in earnings of subsidiaries	119			333.5			—			—			—		(452.5		)	—
	Net income	$	119		$	119		$	322.8		$	10.7		$	—	$	(452.5	)	$	119

Selected_Quarterly_Financial_R1

Selected Quarterly Financial Results (Tables)	12 Months Ended
	Dec. 31, 2013
Selected Quarterly Financial Results (unaudited) [Abstract]	'
Schedule of Quarterly Financial Information [Table Text Block]	'
	(in millions, except per-share amounts)	2013
		First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	Net Sales Detail:
	Corporate:
	Medium/Large	$	1,146.20	$	1,271.40	$	1,203.40		$	1,281.60
	Small Business	257.7		266		262.4			271.4
	Total Corporate	1,403.90		1,537.40		1,465.80			1,553.00
	Public:
	Government	252.3		295.7		375.3			327.3
	Education	232.2		420.6		513.4			282.8
	Healthcare	362.3		366.3		355.9			380.4
	Total Public	846.8		1,082.60		1,244.60			990.5
	Other	161		159.3		153.9			169.8
	Net sales	$	2,411.70	$	2,779.30	$	2,864.30		$	2,713.30
	Gross profit	$	402	$	451.6	$	458.4		$	448.3
	Income from operations (1)	$	120.1	$	153.6	$	92.9		$	142
	Net income (loss) (1)	$	28.3	$	46.7	$	(2.2	)	$	60
	Net income (loss) per common share (1) (2):
	Basic	$	0.19	$	0.32	$	(0.01	)	$	0.35
	Diluted	$	0.19	$	0.32	$	(0.01	)	$	0.35
	(in millions, except per-share amounts)	2012
		First Quarter		Second Quarter		Third Quarter			Fourth Quarter
	Net Sales Detail:
	Corporate:
	Medium/Large	$	1,089.60	$	1,124.70	$	1,055.70		$	1,178.50
	Small Business	273.2		269.7		257.1			264.3
	Total Corporate	1,362.80		1,394.40		1,312.80			1,442.80
	Public:
	Government	262.6		318		408.6			404.9
	Education	221.7		349.5		394.7			226.4
	Healthcare	333.3		372.9		360.4			370
	Total Public	817.6		1,040.40		1,163.70			1,001.30
	Other	138.8		149.9		146.8			156.9
	Net sales	$	2,319.20	$	2,584.70	$	2,623.30		$	2,601.00
	Gross profit	$	384.6	$	426.9	$	432.7		$	425.4
	Income from operations	$	103.6	$	136.4	$	139.7		$	130.9
	Net income	$	10.9	$	36.8	$	38		$	33.3
	Net income per common share (2):
	Basic	$	0.08	$	0.25	$	0.26		$	0.23
	Diluted	$	0.07	$	0.25	$	0.26		$	0.23
	-1	The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.
	-2	Basic and diluted net income (loss) per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income (loss) per share.

Description_Of_Business_And_Su3

Description Of Business And Summary Of Significant Accounting Policies Property Plant and Equipment (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Millions, unless otherwise specified			Machinery and Equipment [Member]	Building and Leasehold Improvements [Member]	Computer and Data Processing Equipment [Member]	Computer Software [Member]	Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]	'	'	'	'	'	'	'
Property, Plant and Equipment, Estimated Useful Lives	'	'	'5B toB 10B years	'5 to 25 years	'3 to 5 years	'3 to 5 years	'5 to 10 years
Asset Retirement Obligation	$0.50	$0.50	'	'	'	'	'

Description_Of_Business_And_Su4

Description Of Business And Summary Of Significant Accounting Policies Goodwill and Other Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'
Goodwill impairment	$0	$0	$0
Finite-Lived Intangible Assets [Line Items]	'	'	'
Impairment of Intangible Assets (Excluding Goodwill)	$0	$0	$0
Customer Relationships [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite Lived Intangible Assets, Estimated Useful Lives	'11B toB 14B years	'	'
Trade Name [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite Lived Intangible Assets, Estimated Useful Lives	'20 years	'	'
Internally Developed Software [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite Lived Intangible Assets, Estimated Useful Lives	'3 to 5 years	'	'
Other Intangible Assets [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Finite Lived Intangible Assets, Estimated Useful Lives	'1 to 10 years	'	'

Description_Of_Business_And_Su5

Description Of Business And Summary Of Significant Accounting Policies Accumulated Other Comprehensive Loss (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	($6.30)	$0.40	($2.10)
Accumulated Other Comprehensive Income (Loss), Net of Tax	($6.30)	$0.40	($2.10)

Recovered_Sheet1

Description of Business and Summary Of Significant Accounting Policies Parentheticals (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Asset Retirement Obligation	$0.50	$0.50	'
Goodwill impairment	0	0	0
Impairment of Intangible Assets (Excluding Goodwill)	$0	$0	$0

Property_And_Equipment_Details

Property And Equipment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Land	$27.70	$27.70	'
Machinery and equipment	53	50.9	'
Building and leasehold improvements	104.8	104	'
Computer and data processing equipment	61.2	56.4	'
Internally Developed Software	30.9	30.2	'
Furniture and fixtures	21.6	21.6	'
Construction in progress	10.9	11.9	'
Total property and equipment	310.1	302.7	'
Less accumulated depreciation	179	160	'
Net property and equipment	131.1	142.7	'
Property, Plant and Equipment, Disposals	7.9	12.2	10.5
Pre-tax loss	0	0.1	0.3
Depreciation expense	$27.20	$32	$31.30

Goodwill_And_Other_Intangible_2

Goodwill And Other Intangible Assets Goodwill and Intangible Assets, Test for Impairment (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 01, 2013	Dec. 01, 2012	Dec. 01, 2011
Goodwill [Line Items]	'	'	'	'
Number of Reportable Segments	2	'	'	'
Number of operating segments which do not meet reporting unit quantitative threshold	2	'	'	'
Goodwill Impairment Test, Income Approach Weight	'	75.00%	75.00%	75.00%
Goodwill Impairment Test, Market Approach Weight	'	25.00%	25.00%	25.00%
Years Forecasted in Goodwill Impairment Income Approach	'	6	6	6
Long-Term Consolidated Annual Growth Rate	'	3.50%	3.50%	3.50%
Corporate Reporting Unit [Member]	'	'	'	'
Goodwill [Line Items]	'	'	'	'
Reporting unit fair value in excess of carrying value	'	107.00%	49.00%	43.00%
Goodwill, Assumptions Used in Impairment Test, Discount Rate	'	10.00%	11.50%	11.50%
Public Segment Reporting Unit [Member]	'	'	'	'
Goodwill [Line Items]	'	'	'	'
Reporting unit fair value in excess of carrying value	'	82.00%	44.00%	27.00%
Goodwill, Assumptions Used in Impairment Test, Discount Rate	'	10.00%	11.50%	11.50%
Canada Reporting Unit [Member]	'	'	'	'
Goodwill [Line Items]	'	'	'	'
Reporting unit fair value in excess of carrying value	'	167.00%	104.00%	159.00%
Goodwill, Assumptions Used in Impairment Test, Discount Rate	'	10.30%	11.80%	12.00%
CDW Advanced Services [Member]	'	'	'	'
Goodwill [Line Items]	'	'	'	'
Reporting unit fair value in excess of carrying value	'	168.00%	17.00%	17.00%
Goodwill, Assumptions Used in Impairment Test, Discount Rate	'	10.50%	12.00%	11.50%

Schedule_of_Goodwill_by_Segmen

Schedule of Goodwill by Segment (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Goodwill [Roll Forward]	'		'		'
Goodwill, Gross	$4,163.10		$4,162.20		'
Period Increase (Decrease)	11		0.9		'
Translation adjustment	-2.1		0.9		'
Contingent consideration related to pre-2009 business combination	13.1	[1]	'		'
Goodwill, Gross	4,174.10		4,163.10		'
Accumulated impairment charges	-1,953.80		-1,953.80		-1,953.80
Goodwill	2,220.30		2,209.30		2,208.40
Corporate [Member]	'		'		'
Goodwill [Roll Forward]	'		'		'
Goodwill, Gross	2,794.40		2,794.40		'
Period Increase (Decrease)	8.8		0		'
Translation adjustment	0		0		'
Contingent consideration related to pre-2009 business combination	8.8	[1]	'		'
Goodwill, Gross	2,803.20		2,794.40		'
Accumulated impairment charges	-1,571.40		-1,571.40		-1,571.40
Goodwill	1,231.80		1,223		1,223
Public [Member]	'		'		'
Goodwill [Roll Forward]	'		'		'
Goodwill, Gross	1,261.40		1,261.40		'
Period Increase (Decrease)	4		0		'
Translation adjustment	0		0		'
Contingent consideration related to pre-2009 business combination	4	[1]	'		'
Goodwill, Gross	1,265.40		1,261.40		'
Accumulated impairment charges	-354.1		-354.1		-354.1
Goodwill	911.3		907.3		907.3
Other [Member]	'		'		'
Goodwill [Roll Forward]	'		'		'
Goodwill, Gross	107.3	[2]	106.4	[2]	'
Period Increase (Decrease)	-1.8	[2]	0.9	[2]	'
Translation adjustment	-2.1	[2]	0.9	[2]	'
Contingent consideration related to pre-2009 business combination	0.3	[1],[2]	'		'
Goodwill, Gross	105.5	[2]	107.3	[2]	'
Accumulated impairment charges	-28.3	[2]	-28.3	[2]	-28.3	[2]
Goodwill	$77.20	[2]	$79	[2]	$78.10	[2]
[1]	During 2013, the Company recorded a $13.1 million net-of-tax addition to goodwill in connection with the settlement of the MPK Coworker Incentive Plan II and related charitable contribution. The charitable contribution was accounted for as additional purchase price (goodwill) in accordance with pre-2009 business combinations accounting guidance. See Note 10 for additional discussion of this transaction.
[2]	Other is comprised of CDW Advanced Services and Canada reporting units.

Intangible_Assets_by_Asset_Typ

Intangible Assets by Asset Type (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$2,413.40	$2,383.40
Accumulated Amortization	1,085.40	904.9
Net Carrying Amount	1,328	1,478.50
Customer Relationships [Member]	'	'
Intangible Assets [Line Items]	'	'
Gross Carrying Amount	1,860.80	1,861.70
Accumulated Amortization	872.8	733.3
Net Carrying Amount	988	1,128.40
Trade Name [Member]	'	'
Intangible Assets [Line Items]	'	'
Gross Carrying Amount	421	421
Accumulated Amortization	130.9	109.9
Net Carrying Amount	290.1	311.1
Internally Developed Software [Member]	'	'
Intangible Assets [Line Items]	'	'
Gross Carrying Amount	128.5	97.4
Accumulated Amortization	79.8	60.1
Net Carrying Amount	48.7	37.3
Other Intangible Assets [Member]	'	'
Intangible Assets [Line Items]	'	'
Gross Carrying Amount	3.1	3.3
Accumulated Amortization	1.9	1.6
Net Carrying Amount	$1.20	$1.70

Amortization_of_Intangible_Ass

Amortization of Intangible Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Abstract]	'	'	'
Amortization of Intangible Assets	$181	$178.20	$173.50
Amortization Expense 2013	179	'	'
Amortization Expense 2014	171.7	'	'
Amortization Expense 2015	163.9	'	'
Amortization Expense 2016	161.5	'	'
Amortization Expense 2017	$161.30	'	'

Inventory_Financing_Agreements2

Inventory Financing Agreements (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Inventory Financing Agreements [Line Items]	'	'
Accounts Payable Inventory Financing	$256,600,000	$249,200,000
Accounts Payable, Inventory Financing [Member]	'	'
Inventory Financing Agreements [Line Items]	'	'
Revolving Loan financing agreement	256,100,000	248,300,000
Other inventory financing agreements	500,000	900,000
Accounts Payable Inventory Financing	256,600,000	249,200,000
Floorplan sub-facility	400,000,000	'
Other Collateralized Inventory Financing Agreements, Current	$500,000	$900,000

Operating_Leases_Details

Operating Leases (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'	'	'
2013	$17.90	'	'
2014	17.7	'	'
2015	13.2	'	'
2016	10.7	'	'
2017	9	'	'
Thereafter	20.7	'	'
Total future minimum lease payments	89.2	'	'
Operating Leases, Rent Expense, Net [Abstract]	'	'	'
Operating Leases, Rent Expense	$20.70	$22.40	$21.60

LongTerm_Debt_Debt_Balances_an

Long-Term Debt Debt Balances and Interest Rates (Details) (USD $)

Mar. 05, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Jul. 31, 2013

Apr. 29, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Feb. 17, 2012

Feb. 21, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

In Millions, unless otherwise specified

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Senior secured notes due 2018 [Member]

Senior secured notes due 2018 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted payments as percent of net income

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted payments as percent of net loss

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net Income free of restrictions under credit agreements

$89

$148

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Weighted Average Interest Rate

'

'

'

0.00%

[1]

'

3.30%

[1]

'

'

'

8.00%

[1]

'

8.50%

[1]

'

'

'

12.54%

[1]

'

'

'

Debt, long-term and short-term

'

3,251.40

'

0

0

1,528.90

'

'

1,339.50

325

500

1,305

1,305

'

42.5

92.5

621.5

0

129

Debt Instrument, Unamortized Discount

'

'

'

'

'

-4.4

1.4

3.4

0

'

'

'

'

'

'

'

'

'

'

Premium, Unamortized

'

'

'

'

'

'

'

'

'

'

'

4.2

5

5.7

'

'

'

'

'

Debt, total long-term and short-term

'

3,251.20

3,771

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Current maturities of long-term debt

'

-45.4

-40

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt

'

$3,205.80

$3,731

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Interest rate at DecemberB 31, 2013.

LongTerm_Debt_Revolving_Loan_D

Long-Term Debt Revolving Loan (Details) (USD $)

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2012

Jun. 24, 2011

Dec. 31, 2013

Dec. 31, 2013

Jul. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apr. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Letter of Credit [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Higher Utilization [Member]

Lower Utilization [Member]

LIBOR [Member]

LIBOR [Member]

LIBOR [Member]

LIBOR [Member]

LIBOR [Member]

LIBOR [Member]

ABR [Member]

ABR [Member]

ABR [Member]

ABR [Member]

Accounts Payable, Inventory Financing [Member]

Accounts Payable, Inventory Financing [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Term Loan [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt, long-term and short-term

$3,251,400,000

'

'

$0

'

$0

'

'

$1,528,900,000

'

$1,339,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

'

'

'

'

'

'

'

2,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Floorplan sub-facility, reserve

'

'

'

256,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,900,000

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

900,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Fee on Unused Portion, Basis Points

'

'

'

25

'

'

'

'

'

'

'

37.5

50

'

'

'

'

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

64,000,000

17,200,000

118,900,000

'

1,600,000

'

'

'

10,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Finance Costs, Net

'

'

'

'

'

'

7,200,000

'

'

6,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount owed under Revolving loan financing agreement

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

246,800,000

'

Floorplan sub-facility, variation in balance due to timing

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,300,000

Variable Interest Rate Margin, ABR Determination, Basis Point Plus Federal Funds Effective Rate

'

'

'

50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable Interest Rate Margin, ABR Determination, Percentage Plus LIBOR

'

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable Interest Rate Margin

'

'

'

'

'

'

'

'

'

'

'

'

'

3.25%

2.00%

2.25%

2.25%

2.50%

2.50%

1.00%

1.25%

1.50%

1.50%

'

'

Potential Margin Reduction

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Secured Leverage Ratio, Maximum to Achieve Potential Margin Reduction

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage reserve for open orders under financing agreement

'

'

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Borrowing Base

'

'

'

1,065,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Remaining Borrowing Capacity

'

'

'

$641,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving Loan, Consecutive Business Days Below Minimum Average Daily Excess Cash Availability Requirement

'

'

'

'5 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revolving Loan, Minimum Average Daily Excess Cash Availability Requirement, Consecutive Business Days Met

'

'

'

'30 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Debt_Term_Loan_Detail

Long-Term Debt Term Loan (Details) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Jun. 24, 2011

Jul. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Apr. 29, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Mar. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Mar. 19, 2012

Mar. 05, 2012

Feb. 17, 2012

20-May-11

Apr. 13, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apr. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Prior Term Loan Facility [Member]

Prior Term Loan Facility [Member]

Prior Term Loan Facility [Member]

Prior Term Loan Facility [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Net Leverage Ratio, greater than 5.5 [Member]

Net Leverage Ratio, less than or equal to 5.5 but greater than 4.5 [Member]

Net Leverage Ratio, less than or equal to 4.5 [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum, less than or equal to 5.5 [Member]

Minimum, greater than 4.5 [Member]

Maximum, less than or equal to 4.5 [Member]

Interest Rate Cap Purchased During 2011 [Member]

Interest Rate Cap Purchased During 2012 [Member]

LIBOR [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

ABR [Member]

LIBOR [Member]

ABR [Member]

LIBOR [Member]

LIBOR [Member]

ABR [Member]

LIBOR [Member]

ABR [Member]

LIBOR [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of long-term debt

$1,535,200,000

$135,700,000

$1,175,000,000

'

'

'

'

'

$1,350,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Fee on Unused Portion, Basis Points

'

'

'

'

25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount, percent of par

'

'

'

'

'

'

'

99.25%

'

'

99.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Unamortized Discount

'

'

'

'

'

'

'

1,400,000

'

-4,400,000

3,400,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Finance Costs, Net

'

'

'

'

'

'

7,200,000

6,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Notional Amount

1,150,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

650,000,000

Deferred financing costs, net

30,100,000

53,200,000

68,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Cap Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

1.50%

Derivative Asset, Noncurrent

0

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt, long-term and short-term

3,251,400,000

'

'

'

0

0

'

'

'

1,528,900,000

'

1,339,500,000

'

'

'

'

1,299,500,000

129,000,000

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Repurchased Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,300,000

100,000

120,600,000

'

665,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Weighted Average Interest Rate

'

'

'

'

0.00%

[1]

'

'

'

'

3.30%

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable Interest Rate Margin

'

'

'

'

'

'

'

'

'

'

'

'

3.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

2.00%

1.25%

2.25%

2.25%

1.50%

2.50%

1.50%

2.50%

'

'

'

'

'

Reference Interest Rate Floor

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

64,000,000

17,200,000

118,900,000

1,600,000

'

'

'

'

'

10,300,000

'

'

'

'

'

3,200,000

'

9,400,000

114,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

190,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term Loan Mandatory Prepayments, percentage of excess cash flow

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

25.00%

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net leverage ratio

'

'

'

'

'

'

'

'

'

3.8

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.5

4.5

4.5

'

'

Quarterly amortization payment of original principal, Percent

'

'

'

'

'

'

'

'

'

0.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Term Loan, Repayments

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

201,000,000

132,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior secured leverage ratio, actual

'

'

'

'

2.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Fees Paid to Lenders

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

97,000,000

'

'

'

7,900,000

37,200,000

59,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Write off of Deferred Debt Issuance Cost

20,100,000

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,500,000

17,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Accrued Interest Paid to Lenders

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$5,000,000

$4,500,000

$36,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Interest rate at DecemberB 31, 2013.

LongTerm_Debt_Interest_Rate_Ca

Long-Term Debt Interest Rate Caps (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Derivative [Line Items]	'	'
Derivative Asset, Noncurrent	$0	$0.10
Derivative, Notional Amount	1,150	'
Interest Rate Cap Purchased During 2011 [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	500	'
Derivative, Cap Interest Rate	3.50%	'
Interest Rate Cap Purchased During 2012 [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Notional Amount	$650	'
Derivative, Cap Interest Rate	1.50%	'

LongTerm_Debt_Senior_Secured_N

Long-Term Debt Senior Secured Notes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Jul. 02, 2013	Dec. 31, 2012
				Senior secured notes due 2018 [Member]	Senior secured notes due 2018 [Member]	Senior secured notes due 2018 [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'
Long-term debt, stated interest rate	'	'	'	8.00%	'	'
Debt, long-term and short-term	$3,251,400,000	'	'	$325,000,000	'	$500,000,000
Debt Instrument, Repurchased Face Amount	'	'	'	'	175,000,000	'
Redemption Premium, percentage of par value	'	'	'	'	108.00%	'
Extinguishment of Debt, Accrued Interest Paid to Lenders	'	'	'	'	700,000	'
Gains (Losses) on Extinguishment of Debt	64,000,000	17,200,000	118,900,000	16,700,000	'	'
Extinguishment of Debt, Fees Paid to Lenders	'	'	'	'	14,000,000	'
Write off of Deferred Debt Issuance Cost	$20,100,000	$3,000,000	'	$2,700,000	'	'

LongTerm_Debt_Senior_Notes_due

Long-Term Debt Senior Notes due 2015 (Details) (USD $)

12 Months Ended

1 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Mar. 19, 2012

Mar. 05, 2012

Feb. 17, 2012

20-May-11

Apr. 13, 2011

Dec. 31, 2013

20-May-11

Apr. 13, 2011

Dec. 31, 2013

20-May-11

Apr. 13, 2011

Dec. 31, 2013

Feb. 29, 2012

31-May-11

Apr. 30, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior notes due 2015 [Member]

Senior Exchange Notes due 2015 [Member]

Senior Exchange Notes due 2015 [Member]

Senior Exchange Notes due 2015 [Member]

Senior PIK Exchange Notes due 2015 [Member]

Senior PIK Exchange Notes due 2015 [Member]

Senior PIK Exchange Notes due 2015 [Member]

Senior PIK Interest Exchange Notes due 2015 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Senior notes due 2019 [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, stated interest rate

'

'

'

'

'

'

'

'

'

'

'

11.00%

'

'

11.50%

'

'

12.25%

'

'

'

8.50%

'

'

Debt, long-term and short-term

$3,251,400,000

'

'

$129,000,000

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,305,000,000

$1,305,000,000

'

Senior Notes, Amount Repurchased

'

'

'

'

'

'

8,300,000

100,000

120,600,000

'

665,100,000

'

321,400,000

519,200,000

'

91,400,000

145,900,000

'

'

'

'

'

'

'

Proceeds from issuance of long-term debt

1,535,200,000

135,700,000

1,175,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

130,000,000

450,000,000

725,000,000

'

'

'

Extinguishment of Debt, Fees Paid to Lenders

'

'

'

'

97,000,000

'

'

'

7,900,000

37,200,000

59,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Accrued Interest Paid to Lenders

'

'

'

'

'

'

'

'

5,000,000

4,500,000

36,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Repurchase Amount

'

'

'

'

'

'

'

'

'

412,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

64,000,000

17,200,000

118,900,000

9,400,000

114,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Write off of Deferred Debt Issuance Cost

20,100,000

3,000,000

'

1,500,000

17,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred financing costs, net

$30,100,000

$53,200,000

$68,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$19,100,000

LongTerm_Debt_Senior_Notes_Det

Long-Term Debt Senior Notes (Details) (USD $)	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 29, 2012	31-May-11	Apr. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Feb. 17, 2012
				Senior notes due 2019 [Member]	Senior notes due 2019 [Member]	Senior notes due 2019 [Member]	Senior notes due 2019 [Member]	Senior notes due 2019 [Member]	Senior notes due 2019 [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'
Long-term debt, stated interest rate	'	'	'	'	'	'	8.50%	'	'
Proceeds from issuance of long-term debt	$1,535.20	$135.70	$1,175	$130	$450	$725	'	'	'
Debt, long-term and short-term	3,251.40	'	'	'	'	'	1,305	1,305	'
Premium, percentage of par value	'	'	'	'	'	'	'	'	104.38%
Premium, Unamortized	'	'	'	'	'	'	$4.20	$5	$5.70

LongTerm_Debt_Senior_Subordina

Long-Term Debt Senior Subordinated Notes (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jul. 02, 2013

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Feb. 21, 2014

Jan. 22, 2014

Oct. 18, 2013

Aug. 01, 2013

Mar. 08, 2013

Dec. 21, 2012

Mar. 10, 2010

Jul. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Aug. 01, 2013

Aug. 01, 2013

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

Term Loan [Member]

IPO Proceeds [Member]

Term Loan Incremental Borrowings [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, stated interest rate

'

'

'

'

'

12.54%

'

'

12.54%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt, long-term and short-term

$3,251,400,000

'

'

'

'

$92,500,000

'

'

$92,500,000

$621,500,000

$42,500,000

'

'

'

'

'

'

'

'

$1,528,900,000

$1,339,500,000

'

'

Debt Instrument, Repurchased Face Amount

'

'

'

'

'

'

'

'

'

'

20,000,000

30,000,000

155,000,000

324,000,000

50,000,000

100,000,000

28,500,000

'

'

'

'

146,000,000

178,000,000

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

190,000,000

'

'

'

'

'

Proceeds from issuance of long-term debt

1,535,200,000

135,700,000

1,175,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,350,000,000

'

'

'

'

Redemption Premium, percentage of par value

'

'

'

'

'

'

'

'

'

'

104.18%

104.18%

104.18%

106.27%

106.27%

106.27%

'

'

'

'

'

'

'

Proceeds from exercise in full of overallotment option

'

'

'

56,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gains (Losses) on Extinguishment of Debt

64,000,000

17,200,000

118,900,000

'

2,700,000

8,500,000

'

3,900,000

24,600,000

7,800,000

'

'

'

'

'

'

'

'

'

10,300,000

'

'

'

Extinguishment of Debt, Fees Paid to Lenders

'

'

'

'

'

'

'

'

'

'

2,100,000

'

6,500,000

20,300,000

3,100,000

6,300,000

'

'

'

'

'

'

'

Write off of Deferred Debt Issuance Cost

20,100,000

3,000,000

'

'

600,000

2,000,000

4,300,000

800,000

'

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Extinguishment of Debt, Accrued Interest Paid to Lenders

'

'

'

'

'

'

'

'

'

'

$900,000

$1,000,000

$200,000

$12,000,000

$2,500,000

$2,300,000

'

'

'

'

'

'

'

LongTerm_Debt_LongTerm_Debt_Ma

Long-Term Debt Long-Term Debt Maturities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Long-term Debt, Unclassified [Abstract]	'	'
Current maturities of long-term debt	$45.40	$40
Long-term Debt Maturity, Repayments of Principal in Year Two	15.4	'
Long-term Debt Maturity, Repayments of Principal in Year Three	15.4	'
Long-term Debt Maturity, Repayments of Principal in Year Four	77.9	'
Long-term Debt Maturity, Repayments of Principal in Year Five	340.4	'
Long-term Debt Maturity, Repayments of Principal after Year Five	2,756.90	'
Debt, total long-term and short-term	$3,251.40	'

LongTerm_Debt_Fair_Value_of_Lo

Long-Term Debt Fair Value of Long-Term Debt (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Feb. 17, 2012
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Debt, long-term and short-term	$3,251.40	'	'
Fair Value, Inputs, Level 2 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Long-term Debt, fair value disclosure	3,415.20	'	'
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Debt, long-term and short-term	3,251.40	'	'
Senior notes due 2019 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Debt, long-term and short-term	1,305	1,305	'
Premium, Unamortized	$4.20	$5	$5.70

LongTerm_Debt_Deferred_Financi

Long-Term Debt Deferred Financing Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Financing Costs [Roll Forward]	'	'
Deferred financing costs, net	$53.20	$68.50
Increase in Deferred Finance Costs	6.1	2.1
Amortization of Financing Costs and Discounts	-9.1	-14.4
Write off of Deferred Debt Issuance Cost	-20.1	-3
Deferred financing costs, net	$30.10	$53.20
Weighted Average Remaining Life, Deferred Finance Costs	'4 years 11 months 7 days	'5 years 1 month 6 days

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income (loss) before income taxes [Abstract]	'	'	'
Domestic	$179.40	$170.30	$11.40
Foreign	16.1	15.8	16.9
Income (loss) before income taxes	$195.50	$186.10	$28.30

Income_Taxes_Income_Tax_Expens

Income Taxes Income Tax Expense by Component (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Income Tax Expense (Benefit) [Abstract]	'	'	'
Federal	$96.70	$110.30	$17.90
State	10.1	8	-0.6
Foreign	4.6	5.1	4.1
Total current	111.4	123.4	21.4
Deferred Income Tax Expense (Benefit) [Abstract]	'	'	'
Domestic	-48.6	-56.2	-9.9
Foreign	-0.1	-0.1	-0.3
Total deferred	-48.7	-56.3	-10.2
Income tax expense	$62.70	$67.10	$11.20

Income_Taxes_Effective_Tax_Rat

Income Taxes Effective Tax Rate Reconciliation (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$68.40	$65.10	$9.90
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%	35.00%	35.00%
State Income Taxes, net of federal effect	-5	0.4	-3.4
Effective Income Tax Rate Reconciliation, State Income Taxes, net of federal effect	-2.60%	0.20%	-11.80%
Income Tax Reconciliation, Share-based Compensation Cost	1.5	5.7	5.1
Effective Income Tax Rate Reconciliation, Share-based Compensation Cost	0.70%	3.10%	17.90%
Income Tax Reconciliation, Effect of rates different than statutory	-1.4	-1.4	-1.1
Effective Income Tax Rate Reconciliation, Effect fo rates different than statutory	-0.70%	-0.80%	-4.00%
Income Tax Reconciliation, Valuation Allowance	0	0	-0.9
Effective Income Tax Rate Reconciliation, Valuation Allowance	0.00%	0.00%	-3.10%
Income Tax Reconciliation, Other Adjustments	-0.8	-2.7	1.6
Effective Income Tax Rate Reconciliation, Other Adjustments	-0.30%	-1.50%	5.70%
Income tax expense	$62.70	$67.10	$11.20
Effective Income Tax Rate	32.10%	36.00%	39.70%

Income_Taxes_Deferred_Tax_Asse

Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Deferred Tax Assets, Gross [Abstract]	'	'
Deferred interest	$42.50	$58.30
State net operating loss and credit carryforwards, net	20.6	18
Payroll and benefits	16.2	16.7
Deferred Tax Assets, Rent	6.4	1.2
Accounts receivable	5.4	4.2
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	1.6	10.3
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1.5	1.8
Deferred Tax Assets, Derivative Instruments	0.8	1.8
Charitable contribution carryforward	0.5	4.1
Deferred financing costs	0.2	2.3
Other	7.1	7.2
Total deferred tax assets	102.8	125.9
Deferred Tax Liabilities, Gross [Abstract]	'	'
Software and intangibles	486.2	551.4
Deferred Income	145.5	146.3
Property and equipment	25	29.3
Other	11.6	9.1
Total deferred tax liabilites	668.3	736.1
Deferred tax assets valuation allowance	0	0
Net deferred tax liabilities	565.5	610.2
Operating Loss Carryforwards [Line Items]	'	'
Undistributed Earnings of Foreign Subsidiaries	52.5	'
State and Local Jurisdiction [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Operating Loss Carryforwards	202.8	'
Tax Credit Carryforward, Amount	$17	'

Income_Taxes_Rollforward_of_Un

Income Taxes Rollforward of Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'
Unrecognized Tax Benefits	$0	$0	'
Unrecognized Tax Benefits	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$0	$0	$0

Income_Taxes_Parentheticals_De

Income Taxes Parentheticals (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized Tax Benefits	$0	$0	$0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	$0	$0	$0

Shareholders_Equity_Details

Shareholders' Equity (Details) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Jul. 02, 2013	Dec. 31, 2012
Class of Stock [Line Items]	'	'	'	'
Proceeds from shares sold by certain selling stockholders	'	$0	'	'
Preferred Stock, Shares Issued	'	0	'	0
Share Price	'	'	$17	'
Proceeds from Issuance Initial Public Offering	'	424,700,000	'	'
Stockholders' Equity Note, Stock Split, Conversion Ratio	143.0299613	'	'	'
Common Stock, Par Value	'	$0.01	'	$0.01
Preferred Stock, Shares Authorized	'	100,000,000	'	0
Preferred Stock, Par or Stated Value Per Share	'	$0.01	'	$0.01
Preferred Stock, Shares Outstanding	'	0	'	0
Common Stock, Shares Authorized	'	1,000,000,000	'	286,100,000
Common Stock, Dividends, Per Share, Cash Paid	'	$0.04	'	'
Dividends, Common Stock, Cash	'	$7,300,000	'	'
IPO [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	23,250,000	'	'
IPO Over-allotment [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Stock Issued During Period, Shares, New Issues	'	3,487,500	'	'
Secondary Offering [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Shares sold by certain selling stockholders	'	15,000,000	'	'
Secondary offering over-allotment [Member]	'	'	'	'
Class of Stock [Line Items]	'	'	'	'
Shares sold by certain selling stockholders	'	2,250,000	'	'

Shareholders_Equity_IPO_and_se

Shareholders' Equity IPO- and secondary-offering related expenses (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
IPO- and secondary-offering related expenses [Abstract]	'		'	'
Accelerated share based compensation expense and related employer payroll taxes	$40.70	[1]	'	'
Charge for payment of RDU Plan cash retention pool	7.5	[2]	'	'
Net proceeds used for termination of Management Services Agreement	24.4	[3]	'	'
Other IPO- and secondary-offering related expenses	2.4		'	'
IPO- and secondary-offering related expenses	$75		$0	$0
[1]	See Note 10 for additional discussion of the impact of the IPO on the Company's equity awards.
[2]	See Note 12 for additional discussion of this transaction
[3]	Represents the payment of a termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities.

EquityBased_Compensation_Detai

Equity-Based Compensation (Details) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Oct. 31, 2007

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Class B Common Unit [Member]

Class B Common Unit [Member]

Class B Common Unit [Member]

2013 Long Term Incentive Plan [Member]

MPK Plan Units [Member]

MPK Plan Units [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Restricted Stock [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

2013 Long Term Incentive Plan [Member]

Equity-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based Compensation Plan Modification, Incremental Compensation Cost

'

'

'

'

$6.60

$3.30

'

'

'

'

'

'

'

'

Accelerated share based compensation expense recognized

36.7

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of incentive compensation plan withholding taxes related to the acceleration of share vesting

24

'

'

'

'

'

'

'

'

'

'

'

'

'

Payment of incentive compensation plan withholding taxes, employer portion

4

'

'

'

'

'

'

'

'

'

'

'

'

'

Accrued contingent consideration

21

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Units Authorized

'

'

'

'

'

'

11,700,000

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding, number

1,280,255

0

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding, weighted-average exercise price

$17

$0

'

'

'

'

'

'

'

'

'

'

'

'

Options, Outstanding, Weighted Average Remaining Contractual Term

'8 years 5 months

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Outstanding, Intrinsic Value

8.1

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Vested, Outstanding, Number

393,517

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Vested, Outstanding, Weighted Average Exercise Price

$17

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Vested, Outstanding, Weighted Average Remaining Contractual Term

'8 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Vested, Outstanding, Aggregate Intrinsic Value

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Expected to Vest, Outstanding, Number

852,713

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Expected to Vest, Outstanding, Weighted Average Exercise Price

$17

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term

'8 years 7 months

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Expected to Vest, Outstanding, Aggregate Intrinsic Value

5.4

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercisable, Number

393,517

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercisable, Weighted Average Exercise Price

$17

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercisable, Weighted Average Remaining Contractual Term

'8 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercisable, Intrinsic Value

2.5

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Grants in Period, Gross

1,288,398

'

'

'

'

'

'

'

'

1,268,986

19,412

'

'

'

Options, Forfeitures and Expirations in Period

-8,143

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price

$17

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercises in Period

0

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Exercises in Period, Weighted Average Exercise Price

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Grants in Period, Weighted Average Exercise Price

$17

'

'

'

'

'

'

'

'

$17

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Instruments Other than Options, Nonvested, Number

'

'

'

'

'

'

'

'

'

'

'

2,592,033

1,351,572

0

Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

'

$119

$125.65

$148.89

'

$1,000

'

'

'

'

$17.03

'

Equity Instruments Other Than Options, Vested in Period

'

'

'

'

'

'

'

'

'

'

'

-1,200,544

-1,844

'

Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

$17

'

Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

$17.01

'

Equity Instruments Other than Options, Vested in Period, Fair Value

26.7

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

$17.04

$0

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period

'

'

'

'

'

'

'

'10 years 0 months 0 days

'

'

'

'

'4 years

'

Equity-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

'

'

'

'

'

'

'

$4.75

'

'

'

'

Weighted-Average Volatility

'

'

'

65.50%

65.26%

82.87%

'

'

'

35.00%

[1]

'

'

'

'

Weighted-Average Risk-Free Rate

'

'

'

0.18%

0.19%

0.84%

'

'

'

1.58%

[2]

'

'

'

'

Dividend Yield

'

'

'

0.00%

0.00%

0.00%

'

'

'

1.00%

'

'

'

'

Fair Value Assumptions, Expected Term

'

'

'

'

'

'

'

'

'

'5 years 5 months

[3]

'

'

'

'

Equity-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Awards Outstanding, Beginning of Year

'

'

'

216,483

'

'

'

'

66,137

'

'

'

'

'

Equity Awards Granted

'

'

'

400

'

'

'

'

0

'

'

3,798,508

1,416,543

'

Equity Awards Forfeited

'

'

'

-860

'

'

'

'

-2,228

'

'

-5,931

-63,127

'

Equity Awards Repurchased/Settled

'

'

'

-216,023

[4]

'

'

'

'

-63,909

[4]

'

'

'

'

'

Equity Awards Outstanding, End of Period

'

'

'

0

216,483

'

'

'

0

'

'

'

'

'

Equity Awards Vested

'

'

'

0

'

'

'

'

0

'

'

'

'

'

Equity-based compensation [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based compensation expense

46.6

22.1

19.5

'

'

'

'

'

'

'

'

'

'

'

Equity-based Compensation Expense, Tax Benefit from Compensation Expense

16.5

2.3

1.9

'

'

'

'

'

'

'

'

'

'

'

Equity-based Compensation Expense, Capitalized Amount

0

0

0

'

'

'

'

'

'

'

'

'

'

'

Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based Compensation Expense Not yet Recognized

$24.90

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity-based Compensation Expense Not yet Recognized, Period for Recognition

'3 years 3 months 15 days

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Based upon an assessment of the two-year, five-year and implied volatility for the Companybs selected peer group, adjusted for the Companybs leverage.

[2]

Based on a composite U.S. Treasury rate.

[3]

The expected term is calculated using theB simplified method. TheB simplified methodB defines the expected term as the average of the optionbs contractual term and the optionbsB weighted-averageB vesting period. The Company utilizes this method as it has limited historical stock option data that is sufficient to derive a reasonable estimate of the expected stock option term.

[4]

As discussed above, the Class B Common Units and MPK Plan Units were converted/settled into shares of the Company's common stock upon completion of the IPO. The converted Class B Common Units, to the extent unvested at the time of the IPO, relate to the grants of restricted stock disclosed above.

Earnings_per_Share_Details

Earnings per Share (Details)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Weighted Average Number of Shares Outstanding, Basic	156.6	145.1	144.8
Effect of diluted securities	2.1	0.7	0.1
Weighted Average Number of Shares Outstanding, Diluted	158.7	145.8	144.9
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	4.3

Deferred_Compensation_Plan_Det

Deferred Compensation Plan (Details) (USD $)

3 Months Ended

12 Months Ended

Mar. 31, 2016

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Oct. 31, 2013

Aug. 01, 2013

Apr. 30, 2013

Feb. 21, 2014

Jan. 22, 2014

Oct. 18, 2013

Aug. 01, 2013

Mar. 08, 2013

Dec. 21, 2012

Mar. 10, 2010

Dec. 31, 2013

Dec. 31, 2013

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

2014 [Member]

2015 through 2017 [Member]

Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Repurchased Face Amount

'

'

'

'

'

'

'

$20,000,000

$30,000,000

$155,000,000

$324,000,000

$50,000,000

$100,000,000

$28,500,000

'

'

Charge for payment of RDU Plan cash retention pool

'

7,500,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Second RDU Cash Retention Payment

7,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption premium added to debt face amount, RDU plan

'

1,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

RDU plan cash retention pool

'

'

'

'

'

15,000,000

'

'

'

'

'

'

'

'

'

'

RDU Plan, Units Authorized for Issuance

'

28,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

RDU Plan, Units Outstanding

'

28,500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Compensation Arrangement with Individual, Requisite Service Period

'

'P3Y0M0D

'

'

'

'

'

'

'

'

'

'

'

'

'

'

RDU Plan, Distributions Paid

'

'

'

'

1,300,000

'

1,700,000

'

'

'

'

'

'

'

'

'

RDU Plan, Compensation Expense

'

16,800,000

8,400,000

8,100,000

'

'

'

'

'

'

'

'

'

'

'

'

RDU Plan, unrecognized compensation expense

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,000,000

7,000,000

RDU Plan, Liability

'

$21,800,000

$15,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

See Note 12 for additional discussion of this transaction

Profit_Sharing_And_401K_Plan_D

Profit Sharing And 401(K) Plan (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract]	'	'	'
Profit sharing plan expense	$17.30	$14.60	$15.30

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Feb. 28, 2014	Jul. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
Litigation Settlement Net Of Expense	'	$10.40
Proceeds from Legal Settlements	$1.90	$8.50

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions [Abstract]	'		'	'
Management Fee	$2.50		$5	$5
Net proceeds used for termination of Management Services Agreement	$24.40	[1]	'	'
[1]	Represents the payment of a termination fee to affiliates of the Sponsors in connection with the termination of the management services agreement with such entities.

Segment_Information_Segment_Re

Segment Information Segment Reporting (Details) (USD $)

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

$2,713.30

$2,864.30

$2,779.30

$2,411.70

$2,601

$2,623.30

$2,584.70

$2,319.20

$10,768.60

$10,128.20

$9,602.40

Income (loss) from operations

142

92.9

[1]

153.6

120.1

130.9

139.7

136.4

103.6

508.6

510.6

470.7

Depreciation and amortization expense

'

'

'

'

'

'

'

'

-208.2

-210.2

-204.9

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Number of Reportable Segments

'

'

'

'

'

'

'

'

2

'

'

Number of operating segments which do not meet reporting unit quantitative threshold

'

'

'

'

'

'

'

'

2

'

'

Net Sales

2,713.30

2,864.30

2,779.30

2,411.70

2,601

2,623.30

2,584.70

2,319.20

10,768.60

10,128.20

9,602.40

Net sales to the federal government, Percentage

'

'

'

'

'

'

'

'

7.00%

10.00%

10.00%

Net sales to customers outside of the US, Percent

'

'

'

'

'

'

'

'

4.00%

4.00%

4.00%

Long-Lived Assets in Foreign Countries, Percent

1.00%

'

'

'

2.00%

'

'

'

1.00%

2.00%

'

IPO- and secondary-offering related expenses

'

'

'

'

'

'

'

'

-75

0

0

Corporate [Member]

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

1,553

1,465.80

1,537.40

1,403.90

1,442.80

1,312.80

1,394.40

1,362.80

5,960.10

5,512.80

5,334.40

Income (loss) from operations

'

'

'

'

'

'

'

'

363.3

349

331.6

Depreciation and amortization expense

'

'

'

'

'

'

'

'

-97.3

-97.6

-97.4

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

1,553

1,465.80

1,537.40

1,403.90

1,442.80

1,312.80

1,394.40

1,362.80

5,960.10

5,512.80

5,334.40

IPO- and secondary-offering related expenses

'

'

'

'

'

'

'

'

-26.4

0

0

Public [Member]

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

990.5

1,244.60

1,082.60

846.8

1,001.30

1,163.70

1,040.40

817.6

4,164.50

4,023

3,757.20

Income (loss) from operations

'

'

'

'

'

'

'

'

246.5

246.7

233.3

Depreciation and amortization expense

'

'

'

'

'

'

'

'

-44

-44

-43.9

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

990.5

1,244.60

1,082.60

846.8

1,001.30

1,163.70

1,040.40

817.6

4,164.50

4,023

3,757.20

IPO- and secondary-offering related expenses

'

'

'

'

'

'

'

'

-14.4

0

0

Other [Member]

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

169.8

153.9

159.3

161

156.9

146.8

149.9

138.8

644

592.4

510.8

Income (loss) from operations

'

'

'

'

'

'

'

'

27.2

18.6

17.5

Depreciation and amortization expense

'

'

'

'

'

'

'

'

-8.6

-9.3

-8.7

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

169.8

153.9

159.3

161

156.9

146.8

149.9

138.8

644

592.4

510.8

IPO- and secondary-offering related expenses

'

'

'

'

'

'

'

'

-3.6

0

0

Corporate, Non-Segment [Member]

'

'

'

'

'

'

'

'

'

'

'

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

-128.4

-103.7

-111.7

Depreciation and amortization expense

'

'

'

'

'

'

'

'

-58.3

-59.3

-54.9

Segment Reporting Information, Additional Information [Abstract]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

IPO- and secondary-offering related expenses

'

'

'

'

'

'

'

'

($30.60)

$0

$0

[1]

The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.

Segment_Information_Segment_Re1

Segment Information Segment Reporting, by Products and Services (Details) (USD $)

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

$2,713.30

$2,864.30

$2,779.30

$2,411.70

$2,601

$2,623.30

$2,584.70

$2,319.20

$10,768.60

$10,128.20

$9,602.40

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

100.00%

100.00%

100.00%

Notebooks/Mobile Devices [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

1,706

1,470.10

1,336.90

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

15.80%

14.50%

13.90%

NetComm Products [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

1,489.10

1,351.10

1,237.70

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

13.80%

13.30%

12.90%

Enterprise and Data Storage (Including Drives) [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

998.1

979.4

929.9

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

9.30%

9.70%

9.70%

Other Hardware [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

4,173.30

4,068.80

3,988.30

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

38.80%

40.20%

41.50%

Software [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

1,994.70

1,849.40

1,767.20

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

18.50%

18.30%

18.40%

Services [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

327.1

284.6

254.3

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

3.00%

2.80%

2.60%

Other [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

80.3

[1]

124.8

[1]

88.1

[1]

Net Sales, by Product and Service, Percentage

'

'

'

'

'

'

'

'

0.80%

[1]

1.20%

[1]

1.00%

[1]

Public [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

990.5

1,244.60

1,082.60

846.8

1,001.30

1,163.70

1,040.40

817.6

4,164.50

4,023

3,757.20

Federal [Member] | Public [Member]

'

'

'

'

'

'

'

'

'

'

'

Net Sales from External Customer [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

$764.40

$964.70

$953.60

[1]

Includes items such as delivery charges to customers and certain commission revenue.

Segment_Information_Parentheti

Segment Information Parentheticals (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]	'	'	'
Net sales to customers outside of the US, Percent	4.00%	4.00%	4.00%

Supplemental_Guarantor_Informa2

Supplemental Guarantor Information Condensed Consolidating Balance Sheets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Millions, unless otherwise specified
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	$188.10	$37.90	$99.90	$36.60
Accounts receivable, net of allowance for doubtful accounts	1,451	1,285	'	'
Merchandise inventory	382	314.6	'	'
Miscellaneous receivables	146.3	148.5	'	'
Deferred income taxes	0	14.1	'	'
Prepaid expenses and other	46.1	34.6	'	'
Total current assets	2,213.50	1,834.70	'	'
Property and equipment, net	131.1	142.7	'	'
Goodwill	2,220.30	2,209.30	2,208.40	'
Other intangible assets, net	1,328	1,478.50	'	'
Deferred financing costs, net	30.1	53.2	68.5	'
Other assets	1.6	1.6	'	'
Total assets	5,924.60	5,720	'	'
Accounts payable-trade	662.8	518.6	'	'
Accounts payable-inventory financing	256.6	249.2	'	'
Current maturities of long-term debt	45.4	40	'	'
Deferred revenue	94.8	57.8	'	'
Total current liabilities	1,402.60	1,168.20	'	'
Debt	3,205.80	3,731	'	'
Deferred income taxes	563.5	624.3	'	'
Other liabilities	41	60	'	'
Total long-term liabilities	3,810.30	4,415.30	'	'
Total shareholders' (deficit) equity	711.7	136.5	-7.3	-43.5
Total liabilities and shareholders' (deficit) equity	5,924.60	5,720	'	'
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	'	'
Deferred income taxes	'	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	'	'
Deferred financing costs, net	0	0	'	'
Other assets	4.9	5.4	'	'
Investments in and advances to subsidiaries	706.8	131.1	'	'
Total assets	711.7	136.5	'	'
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	'	'
Debt	0	0	'	'
Deferred income taxes	0	0	'	'
Accrued interest	'	0	'	'
Other liabilities	0	0	'	'
Total long-term liabilities	0	0	'	'
Total shareholders' (deficit) equity	711.7	136.5	'	'
Total liabilities and shareholders' (deficit) equity	711.7	136.5	'	'
Subsidiary Issuer [Member]	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	196.5	48	102.1	32.9
Accounts receivable, net of allowance for doubtful accounts	0	0	'	'
Merchandise inventory	0	0	'	'
Miscellaneous receivables	49.9	61.7	'	'
Deferred income taxes	'	8.7	'	'
Prepaid expenses and other	10.7	10.1	'	'
Total current assets	257.1	128.5	'	'
Property and equipment, net	69.7	73.9	'	'
Goodwill	751.9	749.4	'	'
Other intangible assets, net	338.5	348.6	'	'
Deferred financing costs, net	30.1	53.2	'	'
Other assets	1.4	1.1	'	'
Investments in and advances to subsidiaries	2,909.40	2,946	'	'
Total assets	4,358.10	4,300.70	'	'
Accounts payable-trade	21.4	16.5	'	'
Accounts payable-inventory financing	0	0	'	'
Current maturities of long-term debt	45.4	40	'	'
Deferred revenue	0	0	'	'
Accrued expenses	163.5	139.3	'	'
Total current liabilities	230.3	195.8	'	'
Debt	3,205.80	3,731	'	'
Deferred income taxes	178.3	188.1	'	'
Accrued interest	'	8	'	'
Other liabilities	36.9	46.7	'	'
Total long-term liabilities	3,421	3,973.80	'	'
Total shareholders' (deficit) equity	706.8	131.1	'	'
Total liabilities and shareholders' (deficit) equity	4,358.10	4,300.70	'	'
Guarantor Subsidiaries [Member]	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	0	0	15.8	1.1
Accounts receivable, net of allowance for doubtful accounts	1,375.90	1,217.70	'	'
Merchandise inventory	378.9	313.2	'	'
Miscellaneous receivables	91	82	'	'
Deferred income taxes	'	5.5	'	'
Prepaid expenses and other	33.4	24.4	'	'
Total current assets	1,879.20	1,642.80	'	'
Property and equipment, net	59.6	66.2	'	'
Goodwill	1,439	1,428.50	'	'
Other intangible assets, net	982.8	1,121.70	'	'
Deferred financing costs, net	0	0	'	'
Other assets	0.1	0.4	'	'
Investments in and advances to subsidiaries	0	0	'	'
Total assets	4,360.70	4,259.60	'	'
Accounts payable-trade	637.3	500.3	'	'
Accounts payable-inventory financing	256.6	249.2	'	'
Current maturities of long-term debt	0	0	'	'
Deferred revenue	89.9	57.8	'	'
Accrued expenses	175.1	157.4	'	'
Total current liabilities	1,158.90	964.7	'	'
Debt	0	0	'	'
Deferred income taxes	388.4	440	'	'
Accrued interest	'	0	'	'
Other liabilities	3.6	4	'	'
Total long-term liabilities	392	444	'	'
Total shareholders' (deficit) equity	2,809.80	2,850.90	'	'
Total liabilities and shareholders' (deficit) equity	4,360.70	4,259.60	'	'
Non-Guarantor Subsidiaries [Member]	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	14	9.8	8.1	10
Accounts receivable, net of allowance for doubtful accounts	75.1	67.3	'	'
Merchandise inventory	3.1	1.4	'	'
Miscellaneous receivables	5.4	4.8	'	'
Deferred income taxes	'	-0.1	'	'
Prepaid expenses and other	5.1	0.1	'	'
Total current assets	102.7	83.3	'	'
Property and equipment, net	1.8	2.6	'	'
Goodwill	29.4	31.4	'	'
Other intangible assets, net	6.7	8.2	'	'
Deferred financing costs, net	0	0	'	'
Other assets	0.9	0.6	'	'
Investments in and advances to subsidiaries	0	0	'	'
Total assets	141.5	126.1	'	'
Accounts payable-trade	26.5	21.7	'	'
Accounts payable-inventory financing	0	0	'	'
Current maturities of long-term debt	0	0	'	'
Deferred revenue	4.9	0	'	'
Accrued expenses	7.5	5.9	'	'
Total current liabilities	38.9	27.6	'	'
Debt	0	0	'	'
Deferred income taxes	1.6	1.7	'	'
Accrued interest	'	0	'	'
Other liabilities	1.4	1.7	'	'
Total long-term liabilities	3	3.4	'	'
Total shareholders' (deficit) equity	99.6	95.1	'	'
Total liabilities and shareholders' (deficit) equity	141.5	126.1	'	'
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	'	'
Deferred income taxes	'	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	'	'
Deferred financing costs, net	0	0	'	'
Other assets	0	0	'	'
Investments in 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	'	'
Debt	0	0	'	'
Deferred income taxes	0	0	'	'
Accrued interest	'	0	'	'
Other liabilities	0	0	'	'
Total long-term liabilities	0	0	'	'
Total shareholders' (deficit) equity	0	0	'	'
Total liabilities and shareholders' (deficit) equity	0	0	'	'
Consolidating Adjustments [Member]	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	-22.4	-19.9	-26.1	-7.4
Accounts receivable, net of allowance for doubtful accounts	0	0	'	'
Merchandise inventory	0	0	'	'
Miscellaneous receivables	0	0	'	'
Deferred income taxes	'	0	'	'
Prepaid expenses and other	-3.1	0	'	'
Total current assets	-25.5	-19.9	'	'
Property and equipment, net	0	0	'	'
Goodwill	0	0	'	'
Other intangible assets, net	0	0	'	'
Deferred financing costs, net	0	0	'	'
Other assets	-5.7	-5.9	'	'
Investments in and advances to subsidiaries	-3,616.20	-3,077.10	'	'
Total assets	-3,647.40	-3,102.90	'	'
Accounts payable-trade	-22.4	-19.9	'	'
Accounts payable-inventory financing	0	0	'	'
Current maturities of long-term debt	0	0	'	'
Deferred revenue	0	0	'	'
Accrued expenses	-3.1	0	'	'
Total current liabilities	-25.5	-19.9	'	'
Debt	0	0	'	'
Deferred income taxes	-4.8	-5.5	'	'
Accrued interest	'	0	'	'
Other liabilities	-0.9	-0.4	'	'
Total long-term liabilities	-5.7	-5.9	'	'
Total shareholders' (deficit) equity	-3,616.20	-3,077.10	'	'
Total liabilities and shareholders' (deficit) equity	-3,647.40	-3,102.90	'	'
Consolidated [Member]	'	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'	'
Cash and cash equivalents	188.1	37.9	99.9	36.6
Accounts receivable, net of allowance for doubtful accounts	1,451	1,285	'	'
Merchandise inventory	382	314.6	'	'
Miscellaneous receivables	146.3	148.5	'	'
Deferred income taxes	'	14.1	'	'
Prepaid expenses and other	46.1	34.6	'	'
Total current assets	2,213.50	1,834.70	'	'
Property and equipment, net	131.1	142.7	'	'
Goodwill	2,220.30	2,209.30	'	'
Other intangible assets, net	1,328	1,478.50	'	'
Deferred financing costs, net	30.1	53.2	'	'
Other assets	1.6	1.6	'	'
Investments in and advances to subsidiaries	0	0	'	'
Total assets	5,924.60	5,720	'	'
Accounts payable-trade	662.8	518.6	'	'
Accounts payable-inventory financing	256.6	249.2	'	'
Current maturities of long-term debt	45.4	40	'	'
Deferred revenue	94.8	57.8	'	'
Accrued expenses	343	302.6	'	'
Total current liabilities	1,402.60	1,168.20	'	'
Debt	3,205.80	3,731	'	'
Deferred income taxes	563.5	624.3	'	'
Accrued interest	'	8	'	'
Other liabilities	41	52	'	'
Total long-term liabilities	3,810.30	4,415.30	'	'
Total shareholders' (deficit) equity	711.7	136.5	'	'
Total liabilities and shareholders' (deficit) equity	$5,924.60	$5,720	'	'

Supplemental_Guarantor_Informa3

Supplemental Guarantor Information Consolidating Statements of Operations (Details) (USD $)

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

$2,713.30

$2,864.30

$2,779.30

$2,411.70

$2,601

$2,623.30

$2,584.70

$2,319.20

$10,768.60

$10,128.20

$9,602.40

Cost of sales

'

'

'

'

'

'

'

'

9,008.30

8,458.60

8,018.90

Gross Profit

448.3

458.4

451.6

402

425.4

432.7

426.9

384.6

1,760.30

1,669.60

1,583.50

Selling and administrative expenses

'

'

'

'

'

'

'

'

1,120.90

1,029.50

990.1

Advertising expense

'

'

'

'

'

'

'

'

130.8

129.5

122.7

Income (loss) from operations

142

92.9

[1]

153.6

120.1

130.9

139.7

136.4

103.6

508.6

510.6

470.7

Interest (expense) income, net

'

'

'

'

'

'

'

'

-250.1

-307.4

-324.2

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

-64

-17.2

-118.9

Other income, net

'

'

'

'

'

'

'

'

1

0.1

0.7

Income (loss) before income taxes

'

'

'

'

'

'

'

'

195.5

186.1

28.3

Income tax benefit (expense)

'

'

'

'

'

'

'

'

-62.7

-67.1

-11.2

Net income (loss)

60

-2.2

[1]

46.7

28.3

33.3

38

36.8

10.9

132.8

119

17.1

Parent Guarantor [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

Cost of sales

'

'

'

'

'

'

'

'

0

0

0

Gross Profit

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative expenses

'

'

'

'

'

'

'

'

24.4

0

0

Advertising expense

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

-24.4

0

0

Interest (expense) income, net

'

'

'

'

'

'

'

'

0

0

0

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

0

0

0

Management fee

'

'

'

'

'

'

'

'

0

0

0

Other income, net

'

'

'

'

'

'

'

'

0

0

0

Income (loss) before income taxes

'

'

'

'

'

'

'

'

-24.4

0

0

Income tax benefit (expense)

'

'

'

'

'

'

'

'

9.2

0

0

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

-15.2

0

0

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

148

119

17.1

Net income (loss)

'

'

'

'

'

'

'

'

132.8

119

17.1

Subsidiary Issuer [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

Cost of sales

'

'

'

'

'

'

'

'

0

0

0

Gross Profit

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative expenses

'

'

'

'

'

'

'

'

103.9

103.7

111.7

Advertising expense

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

-103.9

-103.7

-111.7

Interest (expense) income, net

'

'

'

'

'

'

'

'

-250.6

-308

-324.5

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

-64

-17.2

-118.9

Management fee

'

'

'

'

'

'

'

'

4.3

3.8

9.2

Other income, net

'

'

'

'

'

'

'

'

-0.5

0

0.4

Income (loss) before income taxes

'

'

'

'

'

'

'

'

-414.7

-425.1

-545.5

Income tax benefit (expense)

'

'

'

'

'

'

'

'

142.2

210.6

215.1

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

-272.5

-214.5

-330.4

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

420.5

333.5

347.5

Net income (loss)

'

'

'

'

'

'

'

'

148

119

17.1

Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

10,293.30

9,683

9,222.40

Cost of sales

'

'

'

'

'

'

'

'

8,592.10

8,071.50

7,688.80

Gross Profit

'

'

'

'

'

'

'

'

1,701.20

1,611.50

1,533.60

Selling and administrative expenses

'

'

'

'

'

'

'

'

957.3

891.6

849.2

Advertising expense

'

'

'

'

'

'

'

'

126.8

125.1

119

Income (loss) from operations

'

'

'

'

'

'

'

'

617.1

594.8

565.4

Interest (expense) income, net

'

'

'

'

'

'

'

'

0.2

0.4

0.2

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

0

0

0

Management fee

'

'

'

'

'

'

'

'

0

0

0

Other income, net

'

'

'

'

'

'

'

'

1.2

0.2

0.5

Income (loss) before income taxes

'

'

'

'

'

'

'

'

618.5

595.4

566.1

Income tax benefit (expense)

'

'

'

'

'

'

'

'

-209.5

-272.6

-222.4

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

409

322.8

343.7

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

409

322.8

343.7

Non-Guarantor Subsidiaries [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

475.3

445.2

380

Cost of sales

'

'

'

'

'

'

'

'

416.2

387.1

330.1

Gross Profit

'

'

'

'

'

'

'

'

59.1

58.1

49.9

Selling and administrative expenses

'

'

'

'

'

'

'

'

35.3

34.2

29.2

Advertising expense

'

'

'

'

'

'

'

'

4

4.4

3.7

Income (loss) from operations

'

'

'

'

'

'

'

'

19.8

19.5

17

Interest (expense) income, net

'

'

'

'

'

'

'

'

0.3

0.2

0.1

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

0

0

0

Management fee

'

'

'

'

'

'

'

'

-4.3

-3.8

-9.2

Other income, net

'

'

'

'

'

'

'

'

0.3

-0.1

-0.2

Income (loss) before income taxes

'

'

'

'

'

'

'

'

16.1

15.8

7.7

Income tax benefit (expense)

'

'

'

'

'

'

'

'

-4.6

-5.1

-3.9

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

11.5

10.7

3.8

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

11.5

10.7

3.8

Co-Issuer [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

Cost of sales

'

'

'

'

'

'

'

'

0

0

0

Gross Profit

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative expenses

'

'

'

'

'

'

'

'

0

0

0

Advertising expense

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

0

0

0

Interest (expense) income, net

'

'

'

'

'

'

'

'

0

0

0

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

0

0

0

Management fee

'

'

'

'

'

'

'

'

0

0

0

Other income, net

'

'

'

'

'

'

'

'

0

0

0

Income (loss) before income taxes

'

'

'

'

'

'

'

'

0

0

0

Income tax benefit (expense)

'

'

'

'

'

'

'

'

0

0

0

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

0

0

0

Consolidating Adjustments [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

0

0

0

Cost of sales

'

'

'

'

'

'

'

'

0

0

0

Gross Profit

'

'

'

'

'

'

'

'

0

0

0

Selling and administrative expenses

'

'

'

'

'

'

'

'

0

0

0

Advertising expense

'

'

'

'

'

'

'

'

0

0

0

Income (loss) from operations

'

'

'

'

'

'

'

'

0

0

0

Interest (expense) income, net

'

'

'

'

'

'

'

'

0

0

0

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

0

0

0

Management fee

'

'

'

'

'

'

'

'

0

0

0

Other income, net

'

'

'

'

'

'

'

'

0

0

0

Income (loss) before income taxes

'

'

'

'

'

'

'

'

0

0

0

Income tax benefit (expense)

'

'

'

'

'

'

'

'

0

0

0

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

-568.5

-452.5

-364.6

Net income (loss)

'

'

'

'

'

'

'

'

-568.5

-452.5

-364.6

Consolidated [Member]

'

'

'

'

'

'

'

'

'

'

'

Supplemental Guarantor Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

Net Sales

'

'

'

'

'

'

'

'

10,768.60

10,128.20

9,602.40

Cost of sales

'

'

'

'

'

'

'

'

9,008.30

8,458.60

8,018.90

Gross Profit

'

'

'

'

'

'

'

'

1,760.30

1,669.60

1,583.50

Selling and administrative expenses

'

'

'

'

'

'

'

'

1,120.90

1,029.50

990.1

Advertising expense

'

'

'

'

'

'

'

'

130.8

129.5

122.7

Income (loss) from operations

'

'

'

'

'

'

'

'

508.6

510.6

470.7

Interest (expense) income, net

'

'

'

'

'

'

'

'

-250.1

-307.4

-324.2

Net (loss) gain on extinguishments of long-term debt

'

'

'

'

'

'

'

'

-64

-17.2

-118.9

Management fee

'

'

'

'

'

'

'

'

0

0

0

Other income, net

'

'

'

'

'

'

'

'

1

0.1

0.7

Income (loss) before income taxes

'

'

'

'

'

'

'

'

195.5

186.1

28.3

Income tax benefit (expense)

'

'

'

'

'

'

'

'

-62.7

-67.1

-11.2

(Loss) income before equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

132.8

119

17.1

Equity in earnings (loss) of subsidiaries

'

'

'

'

'

'

'

'

0

0

0

Net income (loss)

'

'

'

'

'

'

'

'

$132.80

$119

$17.10

[1]

The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.

Supplemental_Guarantor_Informa4

Supplemental Guarantor Information Condensed Consolidated Statements of Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$126.10	$121.50	$17.20
Parent Guarantor [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	126.1	121.5	17.2
Subsidiary Issuer [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	141.3	121.5	17.2
Guarantor Subsidiaries [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	409	322.8	343.7
Non-Guarantor Subsidiaries [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	4.8	13.2	2
Co-Issuer [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	0	0	0
Consolidating Adjustments [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	-555.1	-457.5	-362.9
Consolidated [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$126.10	$121.50	$17.20

Supplemental_Guarantor_Informa5

Supplemental Guarantor Information Condensed Consolidating Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	$366.30	$317.40	$214.70
Capital expenditures	-47.1	-41.4	-45.7
Payments for Hedge, Investing Activities	0	0	6.6
Premium payments on interest rate cap agreements	0	-0.3	-3.7
Net cash used in investing activities	-47.1	-41.7	-56
Proceeds from borrowings under revolving credit facility	63	289	1,295
Repayments of borrowings under revolving credit facility	-63	-289	-1,483.20
Repayments of long-term debt	-51.1	-201	-132
Proceeds from issuance of long-term debt	1,535.20	135.7	1,175
Payments to extinguish long-term debt	-2,047.40	-243.2	-1,175
Payments of debt financing costs	-6.1	-2.1	-26.3
Net change in accounts payable-inventory financing	7.4	-29.5	250.5
Payment of incentive compensation plan withholding taxes	-24.1	0	0
Net proceeds from issuance of common shares	424.7	0	0
Dividends paid	-7.3	0	0
Net cash provided by (used in) financing activities	-168.3	-338	-95.4
Effect of exchange rate changes on cash and cash equivalents	-0.7	0.3	0
Net increase (decrease) in cash and cash equivalents	150.2	-62	63.3
Cash and cash equivalents - beginning of period	37.9	99.9	36.6
Cash and cash equivalents - end of period	188.1	37.9	99.9
Parent Guarantor [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	-15.2	0	0
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities	'	'	0
Premium payments on interest rate cap agreements	'	0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0	'	'
Net proceeds from issuance of common shares	424.7	'	'
Dividends paid	-7.3	'	'
Advances to (from) affiliates	-402.2	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	15.2	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents - beginning of period	0	0	0
Cash and cash equivalents - end of period	0	0	0
Subsidiary Issuer [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	-130.3	-204.3	-93.8
Capital expenditures	-40.8	-27	-33.4
Payments for Hedge, Investing Activities	'	'	6.6
Premium payments on interest rate cap agreements	'	-0.3	-3.7
Net cash used in investing activities	-40.8	-27.3	-43.7
Proceeds from borrowings under revolving credit facility	63	289	1,295
Repayments of borrowings under revolving credit facility	-63	-289	-1,483.20
Repayments of long-term debt	-51.1	-201	-132
Proceeds from issuance of long-term debt	1,535.20	135.7	1,175
Payments to extinguish long-term debt	-2,047.40	-243.2	-1,175
Payments of debt financing costs	-6.1	-2.1	-26.3
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	-4	'	'
Net proceeds from issuance of common shares	0	'	'
Dividends paid	0	'	'
Advances to (from) affiliates	892.6	486	552.6
Other financing activities	0.4	2.1	0.6
Net cash provided by (used in) financing activities	319.6	177.5	206.7
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	148.5	-54.1	69.2
Cash and cash equivalents - beginning of period	48	102.1	32.9
Cash and cash equivalents - end of period	196.5	48	102.1
Guarantor Subsidiaries [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	508.8	514.2	327.5
Capital expenditures	-6.2	-14	-10.6
Payments for Hedge, Investing Activities	'	'	0
Premium payments on interest rate cap agreements	'	0	0
Net cash used in investing activities	-6.2	-14	-10.6
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	7.4	-29.5	250.5
Payment of incentive compensation plan withholding taxes	-19.6	'	'
Net proceeds from issuance of common shares	0	'	'
Dividends paid	0	'	'
Advances to (from) affiliates	-490.4	-486.5	-552.7
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	-502.6	-516	-302.2
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	-15.8	14.7
Cash and cash equivalents - beginning of period	0	15.8	1.1
Cash and cash equivalents - end of period	0	0	15.8
Non-Guarantor Subsidiaries [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	5.5	1.3	-0.3
Capital expenditures	-0.1	-0.4	-1.7
Payments for Hedge, Investing Activities	'	'	0
Premium payments on interest rate cap agreements	'	0	0
Net cash used in investing activities	-0.1	-0.4	-1.7
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	-0.5	'	'
Net proceeds from issuance of common shares	0	'	'
Dividends paid	0	'	'
Advances to (from) affiliates	0	0.5	0.1
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	-0.5	0.5	0.1
Effect of exchange rate changes on cash and cash equivalents	-0.7	0.3	0
Net increase (decrease) in cash and cash equivalents	4.2	1.7	-1.9
Cash and cash equivalents - beginning of period	9.8	8.1	10
Cash and cash equivalents - end of period	14	9.8	8.1
Co-Issuer [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	0	0	0
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities	'	'	0
Premium payments on interest rate cap agreements	'	0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0	'	'
Net proceeds from issuance of common shares	0	'	'
Dividends paid	0	'	'
Advances to (from) affiliates	0	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents - beginning of period	0	0	0
Cash and cash equivalents - end of period	0	0	0
Consolidating Adjustments [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	-2.5	6.2	-18.7
Capital expenditures	0	0	0
Payments for Hedge, Investing Activities	'	'	0
Premium payments on interest rate cap agreements	'	0	0
Net cash used in investing activities	0	0	0
Proceeds from borrowings under revolving credit facility	0	0	0
Repayments of borrowings under revolving credit facility	0	0	0
Repayments of long-term debt	0	0	0
Proceeds from issuance of long-term debt	0	0	0
Payments to extinguish long-term debt	0	0	0
Payments of debt financing costs	0	0	0
Net change in accounts payable-inventory financing	0	0	0
Payment of incentive compensation plan withholding taxes	0	'	'
Net proceeds from issuance of common shares	0	'	'
Dividends paid	0	'	'
Advances to (from) affiliates	0	0	0
Other financing activities	0	0	0
Net cash provided by (used in) financing activities	0	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	-2.5	6.2	-18.7
Cash and cash equivalents - beginning of period	-19.9	-26.1	-7.4
Cash and cash equivalents - end of period	-22.4	-19.9	-26.1
Consolidated [Member]	'	'	'
Supplemental Guarantor Information [Line Items]	'	'	'
Net cash provided by (used in) operating activities	366.3	317.4	214.7
Capital expenditures	-47.1	-41.4	-45.7
Payments for Hedge, Investing Activities	'	'	6.6
Premium payments on interest rate cap agreements	'	-0.3	-3.7
Net cash used in investing activities	-47.1	-41.7	-56
Proceeds from borrowings under revolving credit facility	63	289	1,295
Repayments of borrowings under revolving credit facility	-63	-289	-1,483.20
Repayments of long-term debt	-51.1	-201	-132
Proceeds from issuance of long-term debt	1,535.20	135.7	1,175
Payments to extinguish long-term debt	-2,047.40	-243.2	-1,175
Payments of debt financing costs	-6.1	-2.1	-26.3
Net change in accounts payable-inventory financing	7.4	-29.5	250.5
Payment of incentive compensation plan withholding taxes	-24.1	'	'
Net proceeds from issuance of common shares	424.7	'	'
Dividends paid	-7.3	'	'
Advances to (from) affiliates	0	0	0
Other financing activities	0.4	2.1	0.6
Net cash provided by (used in) financing activities	-168.3	-338	-95.4
Effect of exchange rate changes on cash and cash equivalents	-0.7	0.3	0
Net increase (decrease) in cash and cash equivalents	150.2	-62	63.3
Cash and cash equivalents - beginning of period	37.9	99.9	36.6
Cash and cash equivalents - end of period	$188.10	$37.90	$99.90

Selected_Quarterly_Financial_R2

Selected Quarterly Financial Results (Details) (USD $)	3 Months Ended																12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
IPO Related Expenses	'		$74.10		'		'		'		'		'		'		'	'	'
Net Sales	2,713.30		2,864.30		2,779.30		2,411.70		2,601		2,623.30		2,584.70		2,319.20		10,768.60	10,128.20	9,602.40
Gross Profit	448.3		458.4		451.6		402		425.4		432.7		426.9		384.6		1,760.30	1,669.60	1,583.50
Income (loss) from operations	142		92.9	[1]	153.6		120.1		130.9		139.7		136.4		103.6		508.6	510.6	470.7
Net income (loss)	60		-2.2	[1]	46.7		28.3		33.3		38		36.8		10.9		132.8	119	17.1
Basic	$0.35	[2]	($0.01)	[1],[2]	$0.32	[2]	$0.19	[2]	$0.23	[2]	$0.26	[2]	$0.25	[2]	$0.08	[2]	$0.85	$0.82	$0.12
Diluted	$0.35	[2]	($0.01)	[1],[2]	$0.32	[2]	$0.19	[2]	$0.23	[2]	$0.26	[2]	$0.25	[2]	$0.07	[2]	$0.84	$0.82	$0.12
Corporate [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	1,553		1,465.80		1,537.40		1,403.90		1,442.80		1,312.80		1,394.40		1,362.80		5,960.10	5,512.80	5,334.40
Income (loss) from operations	'		'		'		'		'		'		'		'		363.3	349	331.6
Corporate [Member] | Medium/Large [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	1,281.60		1,203.40		1,271.40		1,146.20		1,178.50		1,055.70		1,124.70		1,089.60		'	'	'
Corporate [Member] | Small Business [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	271.4		262.4		266		257.7		264.3		257.1		269.7		273.2		'	'	'
Public [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	990.5		1,244.60		1,082.60		846.8		1,001.30		1,163.70		1,040.40		817.6		4,164.50	4,023	3,757.20
Income (loss) from operations	'		'		'		'		'		'		'		'		246.5	246.7	233.3
Public [Member] | Government [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	327.3		375.3		295.7		252.3		404.9		408.6		318		262.6		'	'	'
Public [Member] | Education [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	282.8		513.4		420.6		232.2		226.4		394.7		349.5		221.7		'	'	'
Public [Member] | Healthcare [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	380.4		355.9		366.3		362.3		370		360.4		372.9		333.3		'	'	'
Other [Member]	'		'		'		'		'		'		'		'		'	'	'
Net Sales	169.8		153.9		159.3		161		156.9		146.8		149.9		138.8		644	592.4	510.8
Income (loss) from operations	'		'		'		'		'		'		'		'		$27.20	$18.60	$17.50
[1]	The third quarter of 2013 included pre-tax IPO-related charges of $74.1 million. See Note 9 for additional discussion of the IPO.
[2]	Basic and diluted net income (loss) per share are computed independently for each of the quarters presented. Therefore, the sum of quarterly basic and diluted per share information may not equal annual basic and diluted net income (loss) per share.

Subsequent_Events_Details

Subsequent Events (Details) (USD $)

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Feb. 21, 2014

Jan. 22, 2014

Oct. 18, 2013

Aug. 01, 2013

Mar. 08, 2013

Dec. 21, 2012

Mar. 10, 2010

Term Loan [Member]

Term Loan [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subordinated Debt [Member]

Subsequent Event [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Repurchased Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

$20,000,000

$30,000,000

$155,000,000

$324,000,000

$50,000,000

$100,000,000

$28,500,000

Gains (Losses) on Extinguishment of Debt

'

64,000,000

17,200,000

118,900,000

10,300,000

'

2,700,000

8,500,000

'

3,900,000

24,600,000

7,800,000

'

'

'

'

'

'

'

Extinguishment of Debt, Fees Paid to Lenders

'

'

'

'

'

'

'

'

'

'

'

'

2,100,000

'

6,500,000

20,300,000

3,100,000

6,300,000

'

Redemption Premium, percentage of par value

'

'

'

'

'

'

'

'

'

'

'

'

104.18%

104.18%

104.18%

106.27%

106.27%

106.27%

'

Extinguishment of Debt, Accrued Interest Paid to Lenders

'

'

'

'

'

'

'

'

'

'

'

'

900,000

1,000,000

200,000

12,000,000

2,500,000

2,300,000

'

Debt, long-term and short-term

'

3,251,400,000

'

'

1,528,900,000

1,339,500,000

'

92,500,000

'

'

92,500,000

621,500,000

42,500,000

'

'

'

'

'

'

Write off of Deferred Debt Issuance Cost

'

$20,100,000

$3,000,000

'

'

'

$600,000

$2,000,000

$4,300,000

$800,000

'

$1,500,000

'

'

'

'

'

'

'

Cash dividends declared per common share

$0.04

$0.04

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Subsequent_Events_Parenthetica1

Subsequent Events Parentheticals (Details) (Subordinated Debt [Member])	Feb. 21, 2014	Jan. 22, 2014	Oct. 18, 2013	Aug. 01, 2013	Mar. 08, 2013	Dec. 21, 2012
Subordinated Debt [Member]	'	'	'	'	'	'
Subsequent Event [Line Items]	'	'	'	'	'	'
Redemption Premium, percentage of par value	104.18%	104.18%	104.18%	106.27%	106.27%	106.27%

Valuation_And_Qualifying_Accou1

Valuation And Qualifying Accounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	$5.40	$5.40	$5
Charged to Costs and Expenses	2.8	3.9	3.6
Deductions	-2.8	-3.9	-3.2
Balance at End of Period	5.4	5.4	5.4
Reserve for Sales Returns [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	4.4	4.5	3.2
Charged to Costs and Expenses	35	33.2	32
Deductions	-34.3	-33.3	-30.7
Balance at End of Period	$5.10	$4.40	$4.50