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Goodwill And Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
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, 2012 and 2011:
(in millions)
Corporate
 
Public
 
Other (1)
 
Consolidated
 
 
 
 
 
 
 
 
Balances as of December 31, 2010:
 
 
 
 
 
 
 
Goodwill
$
2,794.4

 
$
1,261.4

 
$
107.1

 
$
4,162.9

Accumulated impairment charges
(1,571.4
)
 
(354.1
)
 
(28.3
)
 
(1,953.8
)
 
$
1,223.0

 
$
907.3

 
$
78.8

 
$
2,209.1

 
 
 
 
 
 
 
 
2011 Activity:
 
 
 
 
 
 
 
Translation adjustment
$
—

 
$
—

 
$
(0.7
)
 
$
(0.7
)
 
$
—

 
$
—

 
$
(0.7
)
 
$
(0.7
)
 
 
 
 
 
 
 
 
Balances as of December 31, 2011:
 
 
 
 
 
 
 
Goodwill
$
2,794.4

 
$
1,261.4

 
$
106.4

 
$
4,162.2

Accumulated impairment charges
(1,571.4
)
 
(354.1
)
 
(28.3
)
 
(1,953.8
)
 
$
1,223.0

 
$
907.3

 
$
78.1

 
$
2,208.4

 
 
 
 
 
 
 
 
2012 Activity:
 
 
 
 
 
 
 
Translation adjustment
$
—

 
$
—

 
$
0.9

 
$
0.9

 
$
—

 
$
—

 
$
0.9

 
$
0.9

 
 
 
 
 
 
 
 
Balances as of December 31, 2012:
 
 
 
 
 
 
 
Goodwill
$
2,794.4

 
$
1,261.4

 
$
107.3

 
$
4,163.1

Accumulated impairment charges
(1,571.4
)
 
(354.1
)
 
(28.3
)
 
(1,953.8
)
 
$
1,223.0

 
$
907.3

 
$
79.0

 
$
2,209.3

(1)Other is comprised of CDW Advanced Services and Canada reporting units.
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, 2012 and 2011:
(in millions)
 
 
 
 
 
December 31, 2012
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying Amount
Customer relationships
$
1,861.7

 
$
733.3

 
$
1,128.4

Trade name
421.0

 
109.9

 
311.1

Internally developed software
97.4

 
60.1

 
37.3

Other
3.3

 
1.6

 
1.7

Total
$
2,383.4

 
$
904.9

 
$
1,478.5

 
 
 
 
 
 
December 31, 2011
 
 
 
 
 
Customer relationships
$
1,861.4

 
$
593.2

 
$
1,268.2

Trade name
421.0

 
88.8

 
332.2

Internally developed software
77.1

 
43.3

 
33.8

Other
3.3

 
1.5

 
1.8

Total
$
2,362.8

 
$
726.8

 
$
1,636.0
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,
 
2013
$
177.4

2014
173.6

2015
166.3

2016
162.2

2017
161.6