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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment is comprised of the following:
 
December 31,
 
Depreciable
Lives (Years)
(dollars in millions)
2016
 
2015
 
Land and rights-of-way
$
4.3

 
$
4.3

 
20
-
Indefinite
Buildings and leasehold improvements
173.7

 
165.0

 
3
-
40
Network equipment
3,165.7

 
2,959.3

 
2
-
50
Office software, furniture, fixtures and vehicles
150.6

 
131.4

 
2
-
14
Construction in process
17.0

 
29.2

 
n/a
 
 
Gross value
3,511.3

 
3,289.2

 
 
 
 
Accumulated depreciation
(2,425.8
)
 
(2,313.7
)
 
 
 
 
Property, plant and equipment, net
$
1,085.5

 
$
975.5