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Employee Benefits
 6 Months Ended
Jun. 30, 2019
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 and six months ended June 30:
 
 
Three Months
 
Six Months
(in millions)
2019
 
2018
 
2019
 
2018
Service cost
$
—

 
$
0.1

 
$
—

 
$
0.2

Interest cost
11.4

 
10.9

 
22.8

 
21.8

Expected return on plan assets
(14.3
)
 
(15.1
)
 
(28.6
)
 
(30.2
)
Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.2
)
Amortization of prior net pension loss
3.2

 
3.7

 
6.4

 
7.4

Total net periodic pension cost
$
0.2

 
$
(0.5
)
 
$
0.4

 
$
(1.0
)


We expect to contribute $9.9 million to our Company-sponsored pension plans in 2019, of which we have contributed $4.2 million through June 30, 2019.