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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Fair Value, by Balance Sheet Grouping
The carrying value and fair value of the Company’s long-term debt are as follows: 
 
September 30, 2011
 
December 31, 2010
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including current portion
$
2,526.0

 
$
2,349.6

 
$
2,523.6

 
$
2,416.9