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Pension And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Pension And Other Postretirement Benefit Plans [Abstract]  
Components Of Net Periodic Benefit Cost
     Three Months Ended March 31,  

(in millions)

    2012     2011     2012     2011  
     Pension Benefits     Postretirement Benefits  

Service cost – benefits earned during the period

    $ 0.4      $ —        $ —        $ —     

Interest cost

      8.8        7.9        0.5        0.6   

Expected return on plan assets

      (9.7 )      (8.5 )      —          —     

Recognized net actuarial loss

      3.2        3.8        —          0.1   

Amortization of prior service cost

      —          —          (0.9 )      (1.3 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Net periodic cost (benefit)

    $ 2.7      $ 3.2      $ (0.4 )    $ (0.6 )