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Property and Equipment
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property and Equipment.
Net property and equipment consisted of the following (in millions):
December 31,
 20242023
Computer hardware and software$198.2 $180.5 
Furniture, fixtures and equipment36.0 29.6 
Leasehold improvements25.8 27.0 
Work-in-progress13.3 6.5 
 273.3 243.6 
Accumulated depreciation(190.7)(162.2)
$82.6 $81.4 
The Company has capitalized costs related to its various technology initiatives. At December 31, 2024, the net book value of computer software was $49.0 million, which included work-in-progress of $12.7 million. At December 31, 2023, the net book value of computer software was $44.5 million, which included work-in-progress of $4.7 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,
 202420232022
SG&A expenses$30.5 $26.5 $25.3 
Costs of services2.0 1.4 1.0 
$32.5 $27.9 $26.3