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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value 
Schedule of Financial Instruments Recorded at Fair Value
   
Fair Value Measurements
(in millions)
 
   
September 30, 2011
   
December 31, 2010
 
   
Level 1
   
Level 2
   
Level 3
   
Total
   
Level 1
   
Level 2
   
Level 3
   
Total
 
Assets:
                                               
Deferred compensation asset (a)
    -     $ 2.1       -     $ 2.1       -     $ 1.8       -     $ 1.8  
                                                                 
Liabilities:
                                                               
Deferred compensation obligation (a)
    -       2.3       -       2.3       -       2.0       -       2.0  
Convertible preferred stock (b)
    -       -       85.9       85.9       -       -       78.2       78.2  
Reconciliation of Fair Value Using Significant Unobservable Inputs
   
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
   
2011
   
2010
   
2011
   
2010
 
Convertible preferred stock:
                       
Beginning balance
  $ 83.3     $ -     $ 78.2     $ -  
Less: paid-in-kind dividends payable, beginning balance
    (2.6 )     -       (2.4 )     -  
Issuances
    2.6       75.0       7.5       75.0  
Paid-in-kind dividends payable
    2.6       0.8       2.6       0.8  
Total gains or losses (realized/unrealized)
    -       -       -       -  
Ending balance
  $ 85.9     $ 75.8     $ 85.9     $ 75.8  
Fair Value of Debt Table Text Block
   
September 30, 2011
   
December 31, 2010
 
 
Carrying Value
Fair Value
Carrying Value
Fair Value
Credit facility term loan, due May 31, 2012
  $ 85.0     $ 74.4     $ 85.0     $ 85.6  
3.0% convertible senior notes, due October 1, 2014
    530.0       278.3       575.0       517.9