Segment information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Reporting [Abstract] 
Revenue From Segments To Consolidated [Table Text Block]
              
      Three Months Nine Months  
      Ended September 30, Ended September 30, 
 (In millions)  2011 2010 2011 2010 
              
 Revenues:          
  International $ 751.3  547.4  2,158.1  1,556.1 
  North America   244.5  228.7  730.3  684.8 
   Revenues $ 995.8  776.1  2,888.4  2,240.9 
              
Operating Profit Loss From Segments To Consolidated [Table Text Block]
              
      Three Months Nine Months  
      Ended September 30, Ended September 30, 
 (In millions)  2011 2010 2011 2010 
              
 Operating profit:          
  International $ 61.4  52.6  132.8  110.9 
  North America   8.7  5.4  25.9  26.1 
   Segment operating profit   70.1  58.0  158.7  137.0 
  Non-segment   (7.6)  (13.9)  (38.8)  (37.6) 
   Operating profit $ 62.5  44.1  119.9  99.4