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Property and Equipment
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property and Equipment.
7. Property and Equipment
 
Net property and equipment at December 31, 2020 and 2019 consisted of the following (in millions):
 20202019
Computer hardware and software$201.6 $180.2 
Furniture, fixtures and equipment28.0 26.8 
Leasehold improvements28.9 24.7 
Work-in-progress4.8 7.0 
 263.3 238.7 
Less: accumulated depreciation(193.9)(165.0)
$69.4 $73.7 

The Company has capitalized costs related to its various technology initiatives. At December 31, 2020, the net book value of computer software was $34.2 million, which included work-in-progress of $4.8 million. At December 31, 2019, the total net book value of computer software was $34.8 million, which included work-in-progress of $6.4 million.

The following table summarizes the presentation of depreciation expense within the accompanying consolidated statements of operations for the years ended December 31, 2020, 2019 and 2018:

 202020192018
Selling, general and administrative expenses$33.4 $29.8 $28.8 
Costs of services4.6 10.3 7.7 
$38.0 $40.1 $36.5