Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets [Abstract]

Schedule of Goodwill [Table Text Block]

The changes in the carrying amount of goodwill for the years ended December 31, 2014 and 2013 were as follows:

(dollars in millions)	Wireline		IT Services and Hardware		Wireless		Data Center Colocation			Total
Balance as of December 31, 2012	$	11.8	$	2.6	$	—	$	276.2		$	290.6
Goodwill divested from deconsolidation of CyrusOne	—		—		—		(276.2		)	(276.2		)
Balance as of December 31, 2013	11.8		2.6		—		—			14.4
Impairment	—		—		—		—			—
Balance as of December 31, 2014	$	11.8	$	2.6	$	—	$	—		$	14.4

Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]

Summarized below are the carrying values for the major classes of intangible assets subject to amortization:

	Weighted-
	Average	December 31, 2014					December 31, 2013
	Life in	Gross Carrying		Accumulated			Gross Carrying		Accumulated
(dollars in millions)	Years	Amount		Amortization			Amount		Amortization
Customer relationships
Wireline	10	$	7.0	$	(6.6	)	$	7.0	(6.1		)
Wireless	9	8.7		(8.6		)	8.7		(8.5		)
		15.7		(15.2		)	15.7		(14.6		)
Trademarks
Wireless	6	6.2		(5.7		)	6.2		(3.8		)
		21.9		$	(20.9	)	$	21.9	$	(18.4	)

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table presents estimated amortization expense for the assets' remaining useful lives:

(dollars in millions)
2015	$	0.8
2016	0.2