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Property and Equipment—Net
 6 Months Ended
Jun. 30, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY AND EQUIPMENT—Net PROPERTY AND EQUIPMENT—Net
Property and equipment—net consisted of the following (in millions):
 
 June 30,
2020		December 31,
2019
Land$93.3  $93.3  
Building and building improvements148.0  147.4  
Computer equipment and software126.9  116.7  
Leasehold improvements26.7  25.5  
Evaluation units20.4  19.9  
Furniture and fixtures18.7  17.3  
Construction-in-progress114.1  61.2  
Total property and equipment548.1  481.3  
Less: accumulated depreciation(155.5) (137.0) 
Property and equipment—net$392.6  $344.3  

Construction-in-progress consists primarily of costs incurred in connection with the construction of a second building at our headquarters campus. Depreciation expense was $14.1 million and $12.3 million during the three months ended June 30, 2020 and June 30, 2019, respectively. Depreciation expense was $27.7 million and $25.0 million during the six months ended June 30, 2020 and June 30, 2019, respectively.