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Employee Benefits
 3 Months Ended
Mar. 31, 2018
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 plan costs for the three months ended March 31:
 
 
Three Months
(in millions)
2018
 
2017
Service cost
$
0.1

 
$
1.3

Interest cost
10.9

 
12.8

Expected return on plan assets
(15.1
)
 
(14.8
)
Amortization of prior service credit
(0.1
)
 
—

Amortization of prior net pension loss
3.7

 
3.9

Total net periodic pension cost
$
(0.5
)
 
$
3.2



We expect to contribute $15.4 million to our Company-sponsored pension plans in 2018 of which we have contributed $0.3 million through March 31, 2018.