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Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Carrying Value and Fair Value of Other Financial Instruments
The carrying value and fair value of other financial instruments are as follows:
 
March 31, 2014
 
December 31, 2013
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
6 3/8% Senior Notes due 2022
$
525.0

 
$
555.2

 
$
525.0

 
$
539.4

Other financing arrangements
56.4

 
64.1

 
56.3

 
63.8