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Discontinued operations (Tables)
9 Months Ended
Sep. 30, 2011
Discontinued operations [Abstract] 
Summary of certain information with respect to the discontinued operations
                                 
    Three Months Ended,     Nine Months Ended,  
    September 30,     September 30,  
(in millions)   2011     2010     2011     2010  
 
Revenues
  $ —     $ 5.2     $ —     $ 16.5  
Net loss from discontinued operations, net of tax
    —       (5.6 )     —       (23.4 )
Income tax benefit from discontinued operations
  $ —     $ (2.5 )   $ —     $ (12.9 )