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Employee Benefits
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Employee Benefits
Employee Benefits

Qualified and Nonqualified Defined Benefit Pension Plans

The following table presents the components of our Company-sponsored pension costs for the three and nine months ended September 30:
 
 
Three Months
 
Nine Months
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
1.3

 
$
1.6

 
$
3.9

 
$
4.8

Interest cost
12.8

 
14.0

 
38.4

 
42.0

Expected return on plan assets
(14.8
)
 
(14.2
)
 
(44.4
)
 
(42.4
)
Amortization of prior net pension loss
3.9

 
3.5

 
11.7

 
10.3

Total periodic pension cost
$
3.2

 
$
4.9

 
$
9.6

 
$
14.7



We expect to contribute $54.1 million to our Company-sponsored pension plans in 2017 of which we have contributed $39.9 million through September 30, 2017.