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Income taxes (Tables)
3 Months Ended
Mar. 31, 2012
Income Tax Disclosure [Abstract]  
Schedule Of Components Of Income Tax Expense Benefit [TableText Block]
    Three Months  
    Ended March 31,  
    2012  2011  
          
 Continuing operations        
 Provision for income taxes (in millions) $ 16.2   11.4  
 Effective tax rate   40.5%  32.0%