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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value  
Schedule of Financial Instruments Recorded at Fair Value
   
Fair Value Measurements
(in millions)
 
   
September 30, 2012
   
December 31, 2011
 
   
Level 1
   
Level 2
   
Level 3
   
Total
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                                               
Cash equivalents (a)
    -     $ 302.5       -     $ 302.5       -     $ 37.4       -     $ 37.4  
Deferred compensation asset (b)
    -       2.7       -       2.7       -       2.3       -       2.3  
                                                                 
Liabilities:
                                                               
Deferred compensation obligation (b)
    -       3.0       -       3.0       -       2.6       -       2.6  
Schedule of Fair Value of Debt
   
September 30, 2012
   
December 31, 2011
 
   
Carrying Value
   
Fair
Value
   
Carrying Value
   
Fair
Value
 
Credit facility term loan due May 31, 2013
  $ 85.0     $ 93.0       -       -  
Credit facility term loan due May 31, 2012
    -       -     $ 85.0     $ 72.8  
Convertible preferred stock
    97.4       97.4       88.6       88.6  
3.0% convertible senior notes, due October 1, 2014
    530.0       219.6       530.0       246.1