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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment.
Net property and equipment consisted of the following (in millions):
December 31,
 20212020
Computer hardware and software$172.2 $154.3 
Furniture, fixtures and equipment24.0 24.2 
Leasehold improvements24.4 23.9 
Work-in-progress8.2 3.6 
 228.8 206.0 
Less: accumulated depreciation(173.8)(151.1)
$55.0 $54.9 

The Company has capitalized costs related to its various technology initiatives. At December 31, 2021, the net book value of computer software was $27.7 million, which included work-in-progress of $8.2 million. At December 31, 2020, the net book value of computer software was $23.4 million, which included work-in-progress of $3.6 million.

The following table summarizes the presentation of depreciation expense within the accompanying consolidated statements of operations (in millions).

 Year Ended December 31,
 202120202019
Selling, general and administrative expenses$23.4 $23.7 $17.7 
Costs of services4.6 4.6 10.3 
$28.0 $28.3 $28.0