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Segment Information
 6 Months Ended
Jun. 30, 2017
Segment Reporting [Abstract]  
Segment Information
Segment Information
Effective January 1, 2017, the Company established Small Business as its own operating and reportable segment to align the Company's financial reporting with the manner in which the Chief Operating Decision Maker assesses performance and makes resource allocation decisions.
Small Business results were previously presented within the Corporate segment as a sales channel. Segment information reported below in prior periods has been reclassified to conform to the current period presentation. The Company now has three reportable segments: Corporate, primarily serving private sector business customers with more than 250 employees, Small Business, primarily serving private sector business customers with up to 250 employees, and Public, which is comprised of government agencies and education and healthcare institutions in the U.S. The Company has two other operating segments: CDW Canada and CDW UK, both of which do not meet the reportable segment quantitative thresholds and, accordingly, are included in an all other category (“Other”).

Information about the Company’s segments is as follows:
(in millions)

Corporate
 
Small Business

Public

Other

Headquarters

Total
Three Months Ended June 30, 2017:


 
 








Net sales

$
1,630.7

 
$
321.5


$
1,674.1


$
368.1


$
—


$
3,994.4

Income (loss) from operations

127.1

 
19.3


104.5


12.6


(32.4
)

231.1

Depreciation and amortization expense

(20.8
)
 
(5.1
)

(11.2
)

(7.6
)

(20.7
)

(65.4
)



 
 








Three Months Ended June 30, 2016:


 
 








Net sales

$
1,490.8

 
$
288.4


$
1,547.0


$
338.4


$
—


$
3,664.6

Income (loss) from operations

117.5

 
17.7


108.3


9.4


(29.4
)

223.5

Depreciation and amortization expense

(20.7
)
 
(5.2
)

(11.1
)

(8.3
)

(18.4
)

(63.7
)

(in millions)
 
Corporate
 
Small Business
 
Public
 
Other
 
Headquarters
 
Total
Six Months Ended June 30, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
3,107.0

 
$
620.2

 
$
2,850.6

 
$
741.3

 
$
—

 
$
7,319.1

Income (loss) from operations
 
238.5

 
36.0

 
165.1

 
25.2

 
(63.9
)
 
$
400.9

Depreciation and amortization expense
 
(41.7
)
 
(10.3
)
 
(22.4
)
 
(14.6
)
 
(40.5
)
 
$
(129.5
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Six Months Ended June 30, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
2,905.7

 
$
565.7

 
$
2,616.5

 
$
693.4

 
$
—

 
$
6,781.3

Income (loss) from operations
 
219.1

 
34.3

 
166.7

 
17.5

 
(53.1
)
 
$
384.5

Depreciation and amortization expense
 
(41.4
)
 
(10.3
)
 
(22.3
)
 
(16.9
)
 
(36.8
)
 
$
(127.7
)