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Discontinued operations (Tables)
12 Months Ended
Dec. 31, 2011
Discontinued operations [Abstract]  
Summary of certain information with respect to the discontinued operations
                         

(in millions)

  2011     2010     2009  
       

Revenues

  $ —       $ 16.5     $ 26.6  

Net (loss) income from discontinued operations, net of tax

    —         (23.4     1.0  

Income tax benefit (expense) from discontinued operations

    —         12.9       (1.8