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Fair Value Of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Fair value of financial instruments [Abstract]  
Available For Sale Securities [Text Block]
       March 31, December 31, 
 (In millions)   2012 2011 
           
 Mutual Funds      
  Cost $ 7.0  16.9 
  Gross unrealized gains   1.8  3.1 
   Fair value $ 8.8  20.0 
Fixed Rate Debt [Table Text Block]
     March 31, December 31, 
 (In millions)  2012 2011 
         
 DTA bonds      
  Carrying value $ 43.2  43.2 
  Fair value   44.2  44.0 
         
 Unsecured notes issued in a private placement      
  Carrying value   100.0  100.0 
  Fair value   106.3  106.4