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Debt (Tables)
12 Months Ended
Dec. 31, 2011
Debt Disclosure [Abstract]  
Schedule Of Debt [TableTextBlock]
   Maturity 2011 2010  
 Senior notes at 5.95%, net of unamortized discount 2018 $ 298.5 $ 298.3  
 Senior notes at 3.625%, net of unamortized discount 2022   297.8   297.6  
     $ 596.3 $ 595.9  

  2011  2010  
 Weighted average interest rate:      
 At year end   14.02%   14.12% 
 Paid during the year   14.58%   17.00%