Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

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)	2017			2016
Land and rights-of-way	$	4.3		$	4.3		20	-	Indefinite
Buildings and leasehold improvements	179.1			173.7			3	-	40
Network equipment	3,339.4			3,165.7			2	-	50
Office software, furniture, fixtures and vehicles	162.5			150.6			2	-	14
Construction in process	14.7			17.0			n/a
Gross value	3,700.0			3,511.3
Accumulated depreciation	(2,571.0		)	(2,425.8		)
Property, plant and equipment, net	$	1,129.0		$	1,085.5