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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Measurements [Abstract]  
Summary of fair value instruments
The following table categorizes our fair value instruments according to the assumptions used to calculate those values at the end of each of the past two years:

     
Fair Value Measurements Using
 
  Asset /   Quoted Prices in      
Significant
 
Description
 (Liability)   Active Markets for   
Significant Other
  Unobservable 
  Balance at  Identical Assets  Observable Inputs  Inputs 
   
12/31/2012
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
   
 
  
 
  
 
  
 
 
Interest rate swaps
 $(8.4) $-  $(8.4) $- 
                  
Available-for-sale securities
  14.6   14.6   -   - 
                  
Deferred compensation plan assets
  9.4   -   9.4   - 
                  
Supplementary pension plan assets
  8.2   -   8.2   - 
                  
 
     
Fair Value Measurements Using
 
  Asset /   
Quoted Prices in
     
Significant
 
Description
 (Liability)   Active Markets for  
Significant Other
  Unobservable  
  Balance at  Identical Assets  Observable Inputs  Inputs 
 
 
12/31/2011
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
   
 
  
 
  
 
  
 
 
Interest rate swaps
 $(9.0) $-  $(9.0) $- 
                  
Available-for-sale securities
  3.8   3.8   -   - 
                  
Deferred compensation plan assets
  8.0   -   8.0   - 
                  
Supplementary pension plan assets
  7.6   -   7.6   -