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Financial Instruments and Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The carrying and fair values of these financial instruments are as follows: 
 
March 31, 2013
 
December 31, 2012
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Investment in CyrusOne
$
500.8

 
$
1,015.9

 
$

 
$

Long-term debt, including current portion
2,134.0

 
2,196.1

 
2,689.4

 
2,834.6

Other financing arrangements

 

 
60.8

 
69.5