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Pension Plans (Tables)
6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Defined Benefit Pension Plan


     Three Months Ended
June 30
     Six Months Ended
June 30
 

(in millions)

   2017      2016      2017      2016  

Plan net pension credit/(charge):

           

Service cost

   $ (0.3    $ (0.3    $ (0.5    $ (0.5

Interest cost on projected benefit obligation

     (3.7      (5.6      (7.4      (11.0

Expected return on plan assets

     6.1        8.0        12.0        15.8  

Amortization of prior service credit

     0.2        0.3        0.5        0.6  

Amortization of actuarial net losses

     (1.3      (0.7      (2.5      (1.4
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 1.0      $ 1.7      $ 2.1      $ 3.5