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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract]  
Components of Net Pension Expense

The following information details the components of net pension expense for the Company’s defined benefit plans:

 

Three Months Ended March 31,

 

 

 

 

 

2018

 

 

2017

 

Service cost

 

 

 

 

 

$

28.7

 

 

$

23.8

 

Interest on projected benefit obligation

 

 

 

 

 

 

21.3

 

 

 

20.4

 

Expected return on assets

 

 

 

 

 

 

(44.8

)

 

 

(39.8

)

Amortization of prior service costs

 

 

 

 

 

 

.4

 

 

 

.3

 

Recognized actuarial loss

 

 

 

 

 

 

7.7

 

 

 

6.7

 

Net pension expense

 

 

 

 

 

$

13.3

 

 

$

11.4