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Financial Instruments and Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Fair Value, by Balance Sheet Grouping
The carrying value and fair value of the Company’s financial instruments are as follows:
 
December 31, 2014
 
December 31, 2013
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Investment in CyrusOne
$
273.6

 
$
785.0

 
$
471.0

 
$
993.2

Long-term debt, including current portion*
1,686.1

 
1,717.4

 
2,162.7

 
2,248.3

   *Excludes capital leases.
 
 
 
 
 
 
 
  
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]
During 2014, the following assets were remeasured at fair value in connection with impairment tests:
 
 
 
Fair Value Measurements Using
 
 
(dollars in millions)
Year Ended
December 31, 2014
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
Impairment Losses
Property:
 
 
 
 
 
 
 
 
 
       Office software, furniture, fixtures, & vehicles (Wireline)
—

 
—

 
—

 
—

 
$
(4.6
)
       Office software, furniture, fixtures, & vehicles (Wireless)
—

 
—

 
—

 
—

 
(7.5
)
       Impairment of assets
 
 
 
 
 
 
 
 
$
(12.1
)
During 2012, the following assets were remeasured at fair value in connection with impairment tests:
 
 
 
Fair Value Measurements Using
 
 
(dollars in millions)
Year Ended
December 31, 2012
 
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Significant Other Observable Inputs (Level 2)
 
Significant Unobservable Inputs (Level 3)
 
Impairment Losses
Customer relationship intangible
2.8

 
—

 
—

 
2.8

 
(1.5
)
Property:
 
 
 
 
 
 
 
 
 
   Leasehold improvements
2.4

 
—

 
—

 
2.4

 
(11.8
)
   Network equipment
0.4

 
—

 
—

 
0.4

 
(0.5
)
   Other
—

 
—

 
—

 
—

 
(0.4
)
Impairment of assets
 
 
 
 
 
 
 
 
(14.2
)