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Segment Information
 9 Months Ended
Sep. 30, 2015
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 private sector business customers, and Public, which is comprised of government agencies and education and healthcare institutions. The Company also has three other operating segments, CDW Advanced Services, Canada, and Kelway, which do not meet the reportable segment quantitative thresholds and, accordingly, are included in an all other category (“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. The depreciation expense included in Headquarters is not allocated among segments or used in measuring segment performance.
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 a 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 three and nine months ended September 30, 2015 and 2014:
(in millions)

Corporate

Public

Other

Headquarters

Total
Three Months Ended September 30, 2015:










Net sales

$
1,724.5


$
1,468.1


$
308.5


$
—


$
3,501.1

Income (loss) from operations

115.1


106.9


10.0


(27.4
)

204.6

Depreciation and amortization expense

(24.0
)

(10.9
)

(8.8
)

(16.2
)

(59.9
)











Three Months Ended September 30, 2014:










Net sales

$
1,622.7


$
1,468.8


$
174.6


$
—


$
3,266.1

Income (loss) from operations

103.2


101.3


8.5


(28.3
)

184.7

Depreciation and amortization expense

(24.1
)

(10.9
)

(2.2
)

(14.6
)

(51.8
)
(in millions)
 
Corporate
 
Public
 
Other
 
Headquarters
 
Total
Nine Months Ended September 30, 2015:
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
5,059.8

 
$
3,848.2

 
$
662.3

 
$
—

 
$
9,570.3

Income (loss) from operations
 
355.8

 
261.2

 
29.8

 
(84.7
)
 
562.1

Depreciation and amortization expense
 
(72.1
)
 
(32.8
)
 
(13.3
)
 
(46.8
)
 
(165.0
)
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2014:
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
4,784.5

 
$
3,710.3

 
$
529.6

 
$
—

 
$
9,024.4

Income (loss) from operations
 
323.9

 
244.1

 
22.7

 
(82.0
)
 
508.7

Depreciation and amortization expense
 
(72.3
)
 
(32.8
)
 
(6.5
)
 
(44.3
)
 
(155.9
)