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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment, including those acquired by capital lease, consisted of the following:
(in millions)December 31,
2021
December 31,
2020
Computer equipment and furniture$511.8 $451.8 
Purchased software218.3 179.0 
Building and building improvements139.8 118.0 
Land3.2 3.2 
Total cost of property, plant and equipment873.1 752.0 
Less: accumulated depreciation(625.4)(532.3)
Total property, plant and equipment, net of accumulated depreciation$247.7 $219.7 
The December 31, 2021 balances above include fixed assets acquired from our acquisition of Neustar and Sontiq. See Footnote 2, “Business Acquisitions,” for additional information. Depreciation expense, including depreciation of assets recorded under capital leases, for the years ended December 31, 2021, 2020 and 2019, was $98.8 million, $94.0 million and $85.6 million, respectively.