| Schedule of Goodwill [Table Text Block] |
The following table presents the change in goodwill by segment for the years ended December 31, 2014 and 2013: | | | | | | | | | | | | | | | | | (in millions) | Corporate | | Public | | Other (1) | | Consolidated | | | | | | | | | 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 |
| 2013 Activity: | | | | | | | | Translation adjustment | $ | — |
| | $ | — |
| | $ | (2.1 | ) | | $ | (2.1 | ) | Contingent consideration (2) | 8.8 |
| | 4.0 |
| | 0.3 |
| | 13.1 |
| | $ | 8.8 |
| | $ | 4.0 |
| | $ | (1.8 | ) | | $ | 11.0 |
| Balances as of December 31, 2013: | | | | | | | | Goodwill | $ | 2,803.2 |
| | $ | 1,265.4 |
| | $ | 105.5 |
| | $ | 4,174.1 |
| Accumulated impairment charges | (1,571.4 | ) | | (354.1 | ) | | (28.3 | ) | | (1,953.8 | ) | | $ | 1,231.8 |
| | $ | 911.3 |
| | $ | 77.2 |
| | $ | 2,220.3 |
| 2014 Activity: | | | | | | | | Translation adjustment | $ | — |
| | $ | — |
| | $ | (2.7 | ) | | $ | (2.7 | ) | | $ | — |
| | $ | — |
| | $ | (2.7 | ) | | $ | (2.7 | ) | Balances as of December 31, 2014: | | | | | | | | Goodwill | $ | 2,803.2 |
| | $ | 1,265.4 |
| | $ | 102.8 |
| | $ | 4,171.4 |
| Accumulated impairment charges | (1,571.4 | ) | | (354.1 | ) | | (28.3 | ) | | (1,953.8 | ) | | $ | 1,231.8 |
| | $ | 911.3 |
| | $ | 74.5 |
| | $ | 2,217.6 |
|
| | (1) | Other is comprised of CDW Advanced Services, Canada, and Kelway reporting units. There is no goodwill attributable to the Kelway reporting unit. |
| | (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. |
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| 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, 2014 and 2013: | | | | | | | | | | | | | | (in millions) | | | | | | | December 31, 2014 | | Gross Carrying Amount | | Accumulated Amortization | | Net Carrying Amount | Customer relationships | | $ | 1,859.7 |
| | $ | 1,012.1 |
| | $ | 847.6 |
| Trade name | | 421.0 |
| | 152.0 |
| | 269.0 |
| Internally developed software | | 110.1 |
| | 58.9 |
| | 51.2 |
| Other | | 3.2 |
| | 2.2 |
| | 1.0 |
| Total | | $ | 2,394.0 |
| | $ | 1,225.2 |
| | $ | 1,168.8 |
| | | | | | | | December 31, 2013 | | | | | | | Customer relationships | | $ | 1,860.8 |
| | $ | 872.8 |
| | $ | 988.0 |
| Trade name | | 421.0 |
| | 130.9 |
| | 290.1 |
| Internally developed software | | 128.5 |
| | 79.8 |
| | 48.7 |
| Other | | 3.1 |
| | 1.9 |
| | 1.2 |
| Total | | $ | 2,413.4 |
| | $ | 1,085.4 |
| | $ | 1,328.0 |
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