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Pension Plans (Tables)
3 Months Ended
Mar. 31, 2013
Pension Plans [Abstract]  
Defined benefit pension plan
                 
    Three Months Ended
March 31
 

(in millions)

      2013             2012      

Plan net pension credit/(charge):

               

Service cost

  $ (0.4   $ (0.4

Interest cost on projected benefit obligation

    (7.9     (8.0

Expected return on plan assets

    9.0       8.5  

Amortization of prior service credit

    0.3       0.3  

Amortization of actuarial net losses

    (1.7     (0.3
   

 

 

   

 

 

 
    $ (0.7   $ 0.1