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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
Goodwill
The changes in goodwill by reportable segment are as follows:
CorporateSmall BusinessPublic
Other(1)
Consolidated
Balances as of December 31, 2018(2)
$1,074.1 $185.9 $929.6 $273.2 $2,462.8 
Scalar acquisition(3)
— — — 62.0 62.0 
Aptris, Inc. acquisition(4)
16.5 — — — 16.5 
Foreign currency translation— — — 11.7 11.7 
Balances as of December 31, 2019(2)
1,090.6 185.9 929.6 346.9 2,553.0 
IGNW, Inc. acquisition(5)
33.0 — — — 33.0 
Foreign currency translation— — — 9.9 9.9 
Balances as of December 31, 2020(2)
$1,123.6 $185.9 $929.6 $356.8 $2,595.9 
(1)Other is comprised of CDW UK and CDW Canada reporting units.
(2)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.
(3)For additional information regarding the addition to goodwill resulting from the Company's acquisition, see Note 3 (Acquisition).
(4)The Company acquired Aptris, Inc. on October 1, 2019.
(5)The Company acquired IGNW, Inc. on July 1, 2020.
December 1, 2020 and 2019 Impairment Analysis
The Company completed its annual impairment analysis as of December 1, 2020 and 2019. For all reporting units, the Company performed a quantitative analysis. Based on the results of the quantitative analysis the Company determined that the fair values of Corporate, Small Business, Public, CDW UK, and CDW Canada reporting units substantially exceeded their carrying values and no impairment existed.
Other Intangible Assets
A summary of intangible assets is as follows:
December 31, 2020Useful Lives (Years)Gross Carrying AmountAccumulated
Amortization		Net Carrying Amount
Customer relationships and contracts
3 - 14
$2,131.5 $(1,927.9)$203.6 
Trade name
generally 20
422.8 (280.1)142.7 
Internally developed software
3 - 5
280.6 (186.0)94.6 
Other
1 - 10
9.6 (5.4)4.2 
Total$2,844.5 $(2,399.4)$445.1 
December 31, 2019   
Customer relationships and contracts
3 - 14
$2,111.2 $(1,786.4)$324.8 
Trade name
generally 20
422.8 (259.0)163.8 
Internally developed software
3 - 5
263.5 (160.0)103.5 
Other
1 - 10
5.5 (3.5)2.0 
Total$2,803.0 $(2,208.9)$594.1 
During the years ended December 31, 2020, 2019 and 2018, the Company recorded disposals of $25 million, $11 million and $26 million, respectively, to remove fully amortized intangible assets that were no longer in use.
During the years ended December 31, 2020, 2019 and 2018, the Company recorded amortization expense related to intangible assets of $212 million, $219 million and $223 million, respectively.
Estimated future amortization expense related to intangible assets is as follows:
Years ending December 31,Estimated Future Amortization Expense
2021$126.4 
202277.1 
202357.5 
202443.0 
202542.9 
Thereafter98.2 
Total future amortization expense $445.1