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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
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)
2015
 
2014
 
Land and rights-of-way
$
4.3

 
$
4.3

 
20
-
Indefinite
Buildings and leasehold improvements
165.0

 
170.5

 
3
-
40
Network equipment
2,959.3

 
2,686.8

 
2
-
50
Office software, furniture, fixtures and vehicles
131.4

 
123.9

 
2
-
14
Construction in process
29.2

 
25.7

 
n/a
 
 
Gross value
3,289.2

 
3,011.2

 
 
 
 
Accumulated depreciation
(2,313.7
)
 
(2,195.8
)
 
 
 
 
Property, plant and equipment, net
$
975.5

 
$
815.4