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Employee Benefits
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [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 six months ended June 30:
 
 
Three Months
 
Six Months
(in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
1.3

 
$
1.6

 
$
2.6

 
$
3.2

Interest cost
12.8

 
14.0

 
25.6

 
28.0

Expected return on plan assets
(14.8
)
 
(14.1
)
 
(29.6
)
 
(28.2
)
Amortization of net pension loss
3.9

 
3.4

 
7.8

 
6.8

Total periodic pension cost
$
3.2

 
$
4.9

 
$
6.4

 
$
9.8



We expect to contribute $54.1 million to our Company-sponsored pension plans in 2017 of which we have contributed $14.4 million through June 30, 2017.