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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2016
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, 2016
 
December 31, 2015
Computer equipment and furniture
$
226.9

 
$
187.3

Purchased software
105.5

 
75.4

Building and building improvements
97.5

 
91.4

Land
3.2

 
3.2

Total cost of property, plant and equipment
433.1

 
357.3

Less: accumulated depreciation
(235.6
)
 
(174.3
)
Total property, plant and equipment, net of accumulated depreciation
$
197.5

 
$
183.0


Depreciation expense, including depreciation of assets recorded under capital leases, for the years ended December 31, 2016, 2015 and 2014, was $67.7 million, $60.3 million and $56.7 million, respectively.