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Financial Instruments
3 Months Ended
Mar. 31, 2012
Fair Value Disclosures [Abstract]  
Financial Instruments
Financial Instruments
The carrying values of the Company's financial instruments approximate the estimated fair values as of March 31, 2012 and December 31, 2011, except for the Company's debt and other financing arrangements.

The carrying value and fair value of the Company’s long-term debt and other financing arrangements are as follows: 
 
March 31, 2012
 
December 31, 2011
(dollars in millions)
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including current portion
$
2,531.2

 
$
2,472.8

 
$
2,533.6

 
$
2,460.5

Other financing arrangements
$
48.2

 
$
48.3

 
$
47.9

 
$
47.2



The fair value of debt instruments was based on closing or estimated market prices of the Company’s debt at March 31, 2012 and December 31, 2011, which is considered Level 2 of the fair value hierarchy. The fair value of other financing arrangements was calculated using a discounted cash flow model that incorporates current borrowing rates for obligations of similar duration, which is considered Level 3 of the fair value hierarchy.