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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment Information about the Company's segments for the years ended December 31, 2018, 2017 and 2016 are as follows:

(in millions)
 
Corporate
 
Small Business
 
Public
 
Other
 
Headquarters
 
Total
2018:
 
 
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
6,842.5

 
$
1,359.6

 
$
6,154.7

 
$
1,883.7

 
$
—

 
$
16,240.5

Operating income (loss)
 
536.9

 
95.7

 
410.8

 
82.2

 
(138.3
)
 
987.3

Depreciation and amortization expense
 
(81.7
)
 
(20.8
)
 
(45.4
)
 
(31.8
)
 
(85.9
)
 
(265.6
)
 
 
 
 
 
 
 
 
 
 
 
 
 
2017(1):
 
 
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
6,172.8

 
$
1,220.5

 
$
5,906.5

 
$
1,533.1

 
$
—

 
$
14,832.9

Operating income (loss)
 
487.9

 
74.3

 
374.4

 
57.1

 
(127.2
)
 
866.5

Depreciation and amortization expense
 
(83.1
)
 
(20.7
)
 
(44.8
)
 
(30.9
)
 
(81.4
)
 
(260.9
)
 
 
 
 
 
 
 
 
 
 
 
 
 
2016(1):
 
 
 
 
 
 
 
 
 
 
 
 
Net sales
 
$
5,734.9

 
$
1,118.1

 
$
5,477.4

 
$
1,342.3

 
$
—

 
$
13,672.7

Operating income (loss)
 
453.5

 
69.1

 
367.7

 
44.6

 
(114.9
)
 
820.0

Depreciation and amortization expense
 
(82.9
)
 
(20.6
)
 
(44.7
)
 
(32.1
)
 
(74.2
)
 
(254.5
)
Disaggregation of Revenue
 
Year Ended December 31, 2018
 
Corporate
 
Small Business
 
Public
 
Other
 
Total
Geography(1)
 
 
 
 
 
 
 
 
 
United States
$
6,834.4

 
$
1,359.6

 
$
6,154.7

 
$
30.9

 
$
14,379.6

Rest of World
8.1

 
—

 
—

 
1,852.8

 
1,860.9

Total Net sales
6,842.5

 
1,359.6

 
6,154.7

 
1,883.7

 
16,240.5

 
 
 
 
 
 
 
 
 

Major Product and Services
 
 
 
 
 
 
 
 

Hardware
5,455.6

 
1,135.8

 
4,998.9

 
1,492.1

 
13,082.4

Software
982.3

 
174.5

 
976.4

 
213.8

 
2,347.0

Services
337.3

 
28.2

 
162.8

 
169.0

 
697.3

Other(2)
67.3

 
21.1

 
16.6

 
8.8

 
113.8

Total Net sales
6,842.5

 
1,359.6

 
6,154.7

 
1,883.7

 
16,240.5

 
 
 
 
 
 
 
 
 

Sales by Channel
 
 
 
 
 
 
 
 

Corporate
6,842.5

 
—

 
—

 
—

 
6,842.5

Small Business
—

 
1,359.6

 
—

 
—

 
1,359.6

Government
—

 
—

 
2,097.3

 
—

 
2,097.3

Education
—

 
—

 
2,327.4

 
—

 
2,327.4

Healthcare
—

 
—

 
1,730.0

 
—

 
1,730.0

Other
—

 
—

 
—

 
1,883.7

 
1,883.7

Total Net sales
6,842.5

 
1,359.6

 
6,154.7

 
1,883.7

 
16,240.5

 
 
 
 
 
 
 
 
 

Timing of Revenue Recognition
 
 
 
 
 
 
 
 

Transferred at a point in time where CDW is principal
6,256.5

 
1,281.3

 
5,758.6

 
1,687.6

 
14,984.0

Transferred at a point in time where CDW is agent
389.1

 
69.4

 
211.5

 
49.8

 
719.8

Transferred over time where CDW is principal
196.9

 
8.9

 
184.6

 
146.3

 
536.7

Total Net sales
$
6,842.5

 
$
1,359.6

 
$
6,154.7

 
$
1,883.7

 
$
16,240.5


(1)
Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(2)
Includes items such as delivery charges to customers.

 
Year Ended December 31, 2017(1)
 
Corporate
 
Small Business
 
Public
 
Other
 
Total
Geography(2)
 
 
 
 
 
 
 
 
 
United States
$
6,167.4

 
$
1,220.5

 
$
5,906.5

 
$
25.5

 
$
13,319.9

Rest of World
5.4

 
—

 
—

 
1,507.6

 
1,513.0

Total Net sales
6,172.8

 
1,220.5

 
5,906.5

 
1,533.1

 
14,832.9

 
 
 
 
 
 
 
 
 
 
Major Product and Services
 
 
 
 
 
 
 
 
 
Hardware
4,871.6

 
1,012.5

 
4,846.5

 
1,229.8

 
11,960.4

Software
918.5

 
163.1

 
908.3

 
167.0

 
2,156.9

Services
316.2

 
24.5

 
133.5

 
128.5

 
602.7

Other(3)
66.5

 
20.4

 
18.2

 
7.8

 
112.9

Total Net sales
6,172.8

 
1,220.5

 
5,906.5

 
1,533.1

 
14,832.9

 
 
 
 
 
 
 
 
 
 
Sales by Channel
 
 
 
 
 
 
 
 
 
Corporate
6,172.8

 
—

 
—

 
—

 
6,172.8

Small Business
—

 
1,220.5

 
—

 
—

 
1,220.5

Government
—

 

 
2,109.8

 
—

 
2,109.8

Education
—

 
—

 
2,184.5

 
—

 
2,184.5

Healthcare
—

 
—

 
1,612.2

 
—

 
1,612.2

Other
—

 
—

 
—

 
1,533.1

 
1,533.1

Total Net sales
6,172.8

 
1,220.5

 
5,906.5

 
1,533.1

 
14,832.9

 
 
 
 
 
 
 
 
 
 
Timing of Revenue Recognition
 
 
 
 
 
 
 
 
 
Transferred at a point in time where CDW is principal
5,640.9

 
1,152.5

 
5,559.4

 
1,375.7

 
13,728.5

Transferred at a point in time where CDW is agent
344.2

 
59.4

 
184.1

 
27.9

 
615.6

Transferred over time where CDW is principal
187.7

 
8.6

 
163.0

 
129.5

 
488.8

Total Net sales
$
6,172.8

 
$
1,220.5

 
$
5,906.5

 
$
1,533.1

 
$
14,832.9

(1)
Amounts for 2017 have been adjusted to reflect the adoption of Topic 606.
(2)
Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(3)
Includes items such as delivery charges to customers.

 
Year Ended December 31, 2016(1)
 
Corporate
 
Small Business
 
Public
 
Other
 
Total
Geography(2)

 

 

 

 

United States
$
5,594.6

 
$
1,118.1

 
$
5,477.4

 
$
28.2

 
$
12,218.3

Rest of World
140.3

 
—

 
—

 
1,314.1

 
1,454.4

Total Net sales
5,734.9

 
1,118.1

 
5,477.4

 
1,342.3

 
13,672.7

 
 
 
 
 
 
 
 
 
 
Major Product and Services
 
 
 
 
 
 
 
 
 
Hardware
4,495.6

 
908.3

 
4,481.2

 
1,030.9

 
10,916.0

Software
876.3

 
165.0

 
855.4

 
175.6

 
2,072.3

Services
291.5

 
24.1

 
119.6

 
129.0

 
564.2

Other(3)
71.5

 
20.7

 
21.2

 
6.8

 
120.2

Total Net sales
5,734.9

 
1,118.1

 
5,477.4

 
1,342.3

 
13,672.7

 
 
 
 
 
 
 
 
 
 
Sales by Channel
 
 
 
 
 
 
 
 
 
Corporate
5,734.9

 
—

 
—

 
—

 
5,734.9

Small Business
—

 
1,118.1

 
—

 
—

 
1,118.1

Government
—

 
—

 
1,813.6

 
—

 
1,813.6

Education
—

 
—

 
1,994.4

 
—

 
1,994.4

Healthcare
—

 
—

 
1,669.4

 
—

 
1,669.4

Other
—

 
—

 
—

 
1,342.3

 
1,342.3

Total Net sales
5,734.9

 
1,118.1

 
5,477.4

 
1,342.3

 
13,672.7

 
 
 
 
 
 
 
 
 
 
Timing of Revenue Recognition
 
 
 
 
 
 
 
 
 
Transferred at a point in time where CDW is principal
5,279.8

 
1,061.3

 
5,182.4

 
1,201.8

 
12,725.3

Transferred at a point in time where CDW is agent
281.4

 
46.8

 
149.3

 
22.5

 
500.0

Transferred over time where CDW is principal
173.7

 
10.0

 
145.7

 
118.0

 
447.4

Total Net sales
$
5,734.9

 
$
1,118.1

 
$
5,477.4

 
$
1,342.3

 
$
13,672.7

(1)
Amounts for 2016 have been adjusted to reflect the adoption of Topic 606.
(2)
Net sales by geography is generally based on the ship-to address with the exception of certain services that may be performed at, or on behalf of, multiple locations. Such service arrangements are categorized based on the bill-to address.
(3)
Includes items such as delivery charges to customers.







The following table presents Net sales by major category for the years ended December 31, 2018, 2017 and 2016. Categories are based upon internal classifications.
 
Year Ended December 31,
 
2018
 
2017(1)(2)
 
2016(1)(2)
 
Dollars in
Millions
 
Percentage
of Total Net
Sales
 
Dollars in
Millions
 
Percentage
of Total Net
Sales
 
Dollars in
Millions
 
Percentage
of Total Net
Sales
Notebooks/Mobile Devices
$
4,053.6

 
25.0
%
 
$
3,519.8

 
23.7
%
 
$
2,942.9

 
21.5
%
Netcomm Products
2,119.8

 
13.1

 
2,040.3

 
13.8

 
1,957.0

 
14.3

Desktops
1,318.2

 
8.1

 
1,207.0

 
8.1

 
1,087.7

 
8.0

Video
1,185.6

 
7.3

 
1,078.4

 
7.3

 
963.0

 
7.0

Enterprise and Data Storage (Including Drives)
1,099.2

 
6.8

 
1,087.3

 
7.3

 
1,073.9

 
7.9

Other Hardware
3,306.0

 
20.3

 
3,027.6

 
20.4

 
2,891.5

 
21.1

Total Hardware
13,082.4

 
80.6

 
11,960.4

 
80.6

 
10,916.0

 
79.8

 
 
 
 
 
 
 
 
 
 
 
 
Software(3)
2,347.0

 
14.4

 
2,156.9

 
14.5

 
2,072.3

 
15.2

Services(3)
697.3

 
4.3

 
602.7

 
4.1

 
564.2

 
4.1

Other(4)
113.8

 
0.7

 
112.9

 
0.8

 
120.2

 
0.9

Total Net sales
$
16,240.5


100.0
%

$
14,832.9


100.0
%
 
$
13,672.7

 
100.0
%

(1)
Amounts for 2017 and 2016 have been adjusted to reflect the adoption of Topic 606.
(2)
Amounts have been reclassified for changes in individual product classifications to conform to the presentation for the year ended December 31, 2018.
(3)
Certain software and services revenues are recorded on a net basis for accounting purposes. As a result, the category percentage of net revenues is not representative of the category percentage of gross profits.
(4)
Includes items such as delivery charges to customers.