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Fair Value Of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2012
Fair value of financial instruments [Abstract]  
Available For Sale Securities [Text Block]
      June 30, December 31, 
 (In millions)  2012 2011 
          
 Mutual Funds     
  Cost$ 7.0  16.9 
  Gross unrealized gains  1.5  3.1 
   Fair value$ 8.5  20.0 
Fixed Rate Debt [Table Text Block]
    June 30, December 31, 
 (In millions) 2012 2011 
        
 DTA bonds     
  Carrying value$ 43.2  43.2 
  Fair value  44.1  44.0 
        
 Unsecured notes issued in a private placement     
  Carrying value  100.0  100.0 
  Fair value  108.6  106.4