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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
The fair values of non-current financial liabilities at March 31, 2013 and December 31, 2012, determined based on Level 2 inputs, were as follows:
 
 
March 31, 2013
 
December 31, 2012
 
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
 
 
(in millions)
Long-term debt, less current maturities
 
$
1,204.4

 
$
1,338.4

 
$
1,202.1

 
$
1,334.2