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Goodwill and intangible assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and intangible assets | Goodwill and intangible assets Goodwill Changes in the carrying amount of goodwill by reporting unit were as follows:
|  | Total |  | DWS |  | CA&I |  | ECS |  | Other
Balance at December 31, 2021 |  | $ | 315.0 |  |  | $ | 140.9 |  |  | $ | 65.5 |  |  | $ | 98.3 |  |  | $ | 10.3 |
Acquisition - Measurement period adjustments (i) |  | (27.5) |  |  | — |  |  | (27.5) |  |  | — |  |  | — |
Translation adjustments |  | (0.4) |  |  | (0.4) |  |  | — |  |  | — |  |  | — |
Balance at December 31, 2022 |  | 287.1 |  |  | 140.5 |  |  | 38.0 |  |  | 98.3 |  |  | 10.3 |
Translation adjustments |  | 0.3 |  |  | 0.3 |  |  | — |  |  | — |  |  | — |
Balance at December 31, 2023 |  | $ | 287.4 |  |  | $ | 140.8 |  |  | $ | 38.0 |  |  | $ | 98.3 |  |  | $ | 10.3 |
(i) Includes a measurement period adjustment that decreased goodwill by $27.5 million related to a prior period acquisition. At December 31, 2023, the amount of goodwill allocated to reporting units with negative net assets within Other was $10.3 million. At December 31, 2022, there was no goodwill allocated to reporting units with negative net assets. Intangible Assets, Net Intangible assets, net at December 31, 2023 and 2022 consists of the following:
As of December 31, 2023 |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Technology (i) |  | $ | 10.0 |  |  | $ | 8.1 |  |  | $ | 1.9 |
Customer relationships (ii) |  | 54.2 |  |  | 14.1 |  |  | 40.1 |
Marketing (ii) |  | 1.3 |  |  | 0.6 |  |  | 0.7 |
Total |  | $ | 65.5 |  |  | $ | 22.8 |  |  | $ | 42.7 |
As of December 31, 2022 |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Technology (i) |  | $ | 10.0 |  |  | $ | 4.9 |  |  | $ | 5.1 |
Customer relationships (ii)(iii) |  | 54.2 |  |  | 7.9 |  |  | 46.3 |
Marketing (ii) |  | 1.3 |  |  | 0.3 |  |  | 1.0 |
Total |  | $ | 65.5 |  |  | $ | 13.1 |  |  | $ | 52.4 |
(i) Amortization expense is included within cost of revenue - technology in the consolidated statements of income (loss). (ii) Amortization expense is included within selling, general and administrative expense in the consolidated statements of income (loss). (iii) Customer relationships include a measurement period adjustment that increased the fair value of the acquired intangible assets by $27.6 million related to a prior period acquisition. Amortization expense was $9.7 million, $10.1 million and $3.0 million for the years ended December 31, 2023, 2022 and 2021, respectively. The future amortization relating to acquired intangible assets at December 31, 2023 was estimated as follows:
Year |  | Future Amortization Expense
2024 |  | $ | 7.2 |
2025 |  | 4.3 |
2026 |  | 4.0 |
2027 |  | 4.0 |
2028 |  | 4.0 |
Thereafter |  | 19.2 |
Total |  | $ | 42.7 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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