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Cloud Computing Costs | 12 Months Ended
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Dec. 31, 2023
Research and Development [Abstract] |
Cloud Computing Costs | Cloud Computing Costs Capitalized costs to implement cloud computing arrangements at cost and accumulated amortization were as follows:
| As of December 31,
(in millions) | 2023 |  | 2022
Short-term portion | $ | 26.4 |  |  | $ | 18.0 |
Long-term portion | 116.9 |  |  | 87.1 |
Total capitalized implementation costs | 143.3 |  |  | 105.1 |
Less: accumulated amortization | (36.6) |  |  | (17.1) |
Capitalized implementation costs, net | $ | 106.7 |  |  | $ | 88.0 |
Amortization expense is recognized on a straight-line basis over the expected term of the hosting arrangements, which range from three to ten years. Amortization expense was $20.3 million, $12.7 million, and $2.9 million for the years ended December 31, 2023, 2022, and 2021, respectively.

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- Definition The entire disclosure for research, development, and computer software activities, including contracts and arrangements to be performed for others and with federal government. Includes costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility and in-process research and development acquired in a business combination consummated during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 730 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483041/730-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 985 -SubTopic 730 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//985-730/tableOfContent + Details
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