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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in goodwill by reportable segment are as follows:
(in millions) |  | Corporate |  | Small Business(2) |  | Public |  | Other(4) |  | Consolidated
Balance at December 31, 2014(1) |  | $ | 1,045.9 |  |  | $ | 185.9 |  |  | $ | 911.3 |  |  | $ | 74.5 |  |  | $ | 2,217.6 |
Foreign currency translation |  | — |  |  | — |  |  | — |  |  | (22.4 | ) |  | (22.4 | )
Acquisition |  | — |  |  | — |  |  | — |  |  | 305.2 |  |  | 305.2 |
Balance at December 31, 2015(1) |  | 1,045.9 |  |  | 185.9 |  |  | 911.3 |  |  | 357.3 |  |  | 2,500.4 |
Foreign currency translation |  | — |  |  | — |  |  | — |  |  | (45.4 | ) |  | (45.4 | )
CDW Advanced Services Allocation(3) |  | 28.2 |  |  | — |  |  | 18.3 |  |  | (46.5 | ) |  | — |
Balance at December 31, 2016(1) |  | 1,074.1 |  |  | 185.9 |  |  | 929.6 |  |  | 265.4 |  |  | 2,455.0 |
Foreign currency translation |  | — |  |  | — |  |  | — |  |  | 24.6 |  |  | 24.6 |
Balances as of December 31, 2017(1) |  | $ | 1,074.1 |  |  | $ | 185.9 |  |  | $ | 929.6 |  |  | $ | 290.0 |  |  | $ | 2,479.6 |
(1) | Goodwill is net of accumulated impairment losses of $1,571 million, $354 million and $28 million related to the Corporate, Public and Other segments, respectively.
(2) | Amounts have been recast to present Small Business as its own operating and reportable segment.
(3) | Effective January 1, 2016, the CDW Advanced Services business is included in the Company's Corporate and Public segments.
(4) | Other is comprised of Canada and CDW UK operating segments.
Schedule of Finite-Lived Intangible Assets | The following table shows estimated useful lives of definite-lived intangible assets:
Classification | Estimated Useful Lives
Customer relationships and contracts | 3 to 14 years
Trade name | generally 20 years
Internally developed software | 3 to 5 years
Other | 1 to 10 years
A summary of intangible assets is as follows:
(in millions) |  |  |  |  |  |
December 31, 2017 |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships and contracts |  | $ | 2,106.8 |  |  | $ | (1,490.8 | ) |  | $ | 616.0 |
Trade name |  | 422.2 |  |  | (216.3 | ) |  | 205.9 |
Internally developed software |  | 162.6 |  |  | (89.6 | ) |  | 73.0 |
Other |  | 2.9 |  |  | (0.8 | ) |  | 2.1 |
Total |  | $ | 2,694.5 |  |  | $ | (1,797.5 | ) |  | $ | 897.0 |
December 31, 2016 |  |  |  |  |  |
Customer relationships and contracts |  | $ | 2,084.6 |  |  | $ | (1,322.7 | ) |  | $ | 761.9 |
Trade name |  | 422.1 |  |  | (195.2 | ) |  | 226.9 |
Internally developed software |  | 142.6 |  |  | (77.7 | ) |  | 64.9 |
Other |  | 6.0 |  |  | (4.1 | ) |  | 1.9 |
Total |  | $ | 2,655.3 |  |  | $ | (1,599.7 | ) |  | $ | 1,055.6 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated future amortization expense related to intangible assets is as follows:
(in millions) |  |
Years ending December 31, |  | Estimated Future Amortization Expense
2018 |  | $ | 219.8 |
2019 |  | 201.4 |
2020 |  | 167.6 |
2021 |  | 72.3 |
2022 |  | 38.4 |
Thereafter |  | 197.5 |
Total future amortization expense |  | $ | 897.0 |

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