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Goodwill and Other Intangible Assets
 12 Months Ended
Dec. 31, 2021
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, 2019(2)
$1,090.6 $185.9 $929.6 $346.9 $2,553.0 
IGNW, Inc. acquisition33.0 — — — 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 
Amplified IT acquisition(3)
— — 133.8 — 133.8 
Focal Point acquisition(3)
— — 82.7 — 82.7 
Sirius acquisition(3)
900.6 80.2 591.6 — 1,572.4 
Other acquisition adjustments0.2 — — — 0.2 
Foreign currency translation— — — (2.1)(2.1)
Balances as of December 31, 2021(2)
$2,024.4 $266.1 $1,737.7 $354.7 $4,382.9 
(1)Other is comprised of CDW UK and CDW Canada operating segments.
(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, recorded in 2008 and 2009.
(3)For additional information regarding the Company’s acquisitions, see Note 3 (Acquisitions).
Other Intangible Assets
A summary of intangible assets is as follows:
December 31, 2021Useful Lives (Years)Gross Carrying AmountAccumulated
Amortization		Net Carrying Amount
Customer relationships
3 - 14
$3,330.9 $(1,987.8)$1,343.1 
Trade name
1 - 20
472.7 (302.0)170.7 
Internally developed software
3 - 5
352.0 (239.8)112.2 
Other
1 - 10
2.5 (0.4)2.1 
Total$4,158.1 $(2,530.0)$1,628.1 
December 31, 2020   
Customer relationships
3 - 14
$2,131.5 $(1,927.9)$203.6 
Trade name
1 - 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 
During the years ended December 31, 2021, 2020 and 2019, the Company recorded disposals of $2 million, $25 million and $11 million, respectively, to remove fully amortized intangible assets that were no longer in use.
During the years ended December 31, 2021, 2020 and 2019, the Company recorded amortization expense related to intangible assets of $149 million, $212 million and $219 million, respectively.
Estimated future amortization expense related to intangible assets is as follows:
Years ending December 31,Estimated Future Amortization Expense
2022$218.7 
2023197.9 
2024178.1 
2025149.9 
2026147.9 
Thereafter735.6 
Total future amortization expense $1,628.1