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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
Schedule assets and liabilities measured at fair value on a recurring basis
The following tables present the assets and liabilities that are measured at fair value on a recurring basis in our balance sheets:

   
Balance at
  
Basis of Fair Value Measurements
 
   
December 31,
          
($ in millions)
 
2011
  
Level 1
  
Level 2
  
Level 3
 
Assets:
            
Short-term investments
 $26.5  $26.5  $-  $- 
Deferred compensation assets
  3.3   3.3   -   - 
   $29.8  $29.8  $-  $- 
Liabilities:
                
Contingent consideration
 $2.1  $-  $-  $2.1 
Deferred compensation liabilities
  4.6   4.6   -   - 
Interest rate swap contracts
  8.8   -   8.8   - 
   $15.5  $4.6  $8.8  $2.1 
 
   
Balance at
  
Basis of Fair Value Measurements
 
   
December 31,
          
($ in millions)
 
2010
  
Level 1
  
Level 2
  
Level 3
 
Assets:
            
Short-term investments
 $0.6  $0.6  $-  $- 
Deferred compensation assets
  3.6   3.6   -   - 
   $4.2  $4.2  $-  $- 
Liabilities:
                
Contingent consideration
 $2.3  $-  $-  $2.3 
Deferred compensation liabilities
  5.4   5.4   -   - 
Interest rate swap contracts
  6.1   -   6.1   - 
   $13.8  $5.4  $6.1  $2.3 
Summary of changes in Level 3 Fair Value Measurements
The following table provides a summary of changes in our Level 3 fair value measurements during 2011:

   
($ in millions)
 
Balance, December 31, 2010
 $2.3 
Increase in fair value recorded in earnings
  0.5 
Reduction in fair value recorded in earnings
  (0.8)
Changes in foreign currency exchange rates
  0.1 
Balance, December 31, 2011
 $2.1 

The following table provides a summary of changes in our Level 3 fair value measurements during 2010:

   
($ in millions)
 
Balance, December 31, 2009
 $2.8 
Additional contingent consideration acquired
  1.8 
Increase in fair value recorded in earnings
  0.2 
Reduction in fair value recorded in earnings
  (2.1)
Changes in foreign currency exchange rates
  (0.4)
Balance, December 31, 2010
 $2.3