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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
 
2017
 
Land and rights-of-way
$
117.2

 
$
4.3

 
20
-
Indefinite
Buildings and leasehold improvements
305.2

 
179.1

 
5
-
40
Network equipment
3,913.3

 
3,339.4

 
2
-
50
Office software, furniture, fixtures and vehicles
216.3

 
162.5

 
2
-
14
Construction in process
47.1

 
14.7

 
n/a
 
 
Gross value
4,599.1

 
3,700.0

 
 
 
 
Accumulated depreciation
(2,755.1
)
 
(2,571.0
)
 
 
 
 
Property, plant and equipment, net
$
1,844.0

 
$
1,129.0