Supplemental cash flow information (Tables)
9 Months Ended
Sep. 30, 2011
Supplemental Cash Flow Information [Abstract] 
Schedule Of Cash Flow Supplemental Disclosures [TableTextBlock]
     Nine Months 
     Ended September 30, 
 (In millions)  2011 2010 
         
 Cash paid for:      
  Interest $ 17.0  7.7 
  Income taxes   60.0  48.7