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Property and Equipment | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property and Equipment. | Net property and equipment consisted of the following (in millions):
|  | December 31,
|  | 2023 |  | 2022
Computer hardware and software |  | $ | 180.5 |  |  | $ | 201.3 |
Furniture, fixtures and equipment |  | 29.6 |  |  | 27.9 |
Leasehold improvements |  | 27.0 |  |  | 27.0 |
Work-in-progress |  | 6.5 |  |  | 7.4 |
|  | 243.6 |  |  | 263.6 |
Less: accumulated depreciation |  | (162.2) |  |  | (197.3) |
|  | $ | 81.4 |  |  | $ | 66.3 |
The Company has capitalized costs related to its various technology initiatives. At December 31, 2023, the net book value of computer software was $44.5 million, which included work-in-progress of $4.7 million. At December 31, 2022, the net book value of computer software was $35.8 million, which included work-in-progress of $7.3 million. The following table summarizes the presentation of depreciation expense within the accompanying consolidated statements of operations and comprehensive income (in millions).
|  | Year Ended December 31,
|  | 2023 |  | 2022 |  | 2021
Selling, general, and administrative expenses |  | $ | 26.5 |  |  | $ | 25.3 |  |  | $ | 23.4 |
Costs of services |  | 1.4 |  |  | 1.0 |  |  | 4.6 |
|  | $ | 27.9 |  |  | $ | 26.3 |  |  | $ | 28.0 |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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