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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2018
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,
 2018
 
December 31,
 2017
Computer equipment and furniture
$
341.0

 
$
276.1

Purchased software
134.4

 
119.4

Building and building improvements
107.9

 
99.2

Land
3.2

 
3.2

Total cost of property, plant and equipment
586.5

 
497.9

Less: accumulated depreciation
(366.2
)
 
(299.3
)
Total property, plant and equipment, net of accumulated depreciation
$
220.3

 
$
198.6


Depreciation expense, including depreciation of assets recorded under capital leases, for the years ended December 31, 2018, 2017 and 2016, was $76.6 million, $67.9 million and $67.7 million, respectively.