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Property, Plant and Equipment, net
3 Months Ended
Mar. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net
9. Property, Plant and Equipment, net

Property, plant and equipment consists of the following (in millions):
 
 
March 31, 2019
 
December 31, 2018
Cable-ships and submersibles
 
$
248.7

 
$
251.1

Equipment, furniture and fixtures, and software
 
155.4

 
148.0

Building and leasehold improvements
 
46.6

 
47.3

Land
 
32.7

 
32.8

Construction in progress
 
18.7

 
12.9

Plant and transportation equipment
 
12.3

 
12.0

 
 
514.4

 
504.1

Less: Accumulated depreciation
 
137.8

 
127.8

Total
 
$
376.6

 
$
376.3



Depreciation expense was $12.4 million and $11.2 million for the three months ended March 31, 2019 and 2018, respectively. These amounts included $2.2 million and $1.6 million of depreciation expense within cost of revenue for the three months ended March 31, 2019 and 2018, respectively.

Total net book value of equipment, cable-ships, and submersibles under capital leases consisted of $40.5 million and $40.0 million as of March 31, 2019 and December 31, 2018, respectively.