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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2018
Components of Net Periodic Cost for Defined Benefit Pension Plan and Other Postretirement Benefit Plan

The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables:

 

     Three Months Ended June 30,      Six Months Ended June 30,  
Net Periodic Pension Cost    2018      2017      2018      2017  

Interest cost

   $ 4.1      $ 4.3      $ 8.2      $ 8.6  

Actuarial loss amortization

     3.6        3.2        7.2        6.4  

Less: Expected return on plan assets

     (6.5      (6.6      (13.0      (13.2
  

 

 

    

 

 

    

 

 

    

 

 

 

Net periodic pension cost

   $ 1.2      $ 0.9      $ 2.4      $ 1.8  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

Net Periodic Postretirement Benefit    Three Months Ended June 30,      Six Months Ended June 30,  
   2018      2017      2018      2017  

Service benefit

   $ (0.1    $ (0.1    $ (0.2    $ (0.2

Interest cost

     0.1        0.1        0.2        0.2  

Actuarial gain amortization

     (0.6      (0.6      (1.2      (1.2
  

 

 

    

 

 

    

 

 

    

 

 

 

Net periodic postretirement benefit gain

   $ (0.6    $ (0.6    $ (1.2    $ (1.2