XML 22 R10.htm IDEA: XBRL DOCUMENT v3.10.0.1
Employee Benefits
 6 Months Ended
Jun. 30, 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 and six months ended June 30:
 
 
Three Months
 
Six Months
(in millions)
2018
 
2017
 
2018
 
2017
Service cost
$
0.1

 
$
1.3

 
$
0.2

 
$
2.6

Interest cost
10.9

 
12.8

 
21.8

 
25.6

Expected return on plan assets
(15.1
)
 
(14.8
)
 
(30.2
)
 
(29.6
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.2
)
 
—

Amortization of prior net pension loss
3.7

 
3.9

 
7.4

 
7.8

Total net periodic pension cost
$
(0.5
)
 
$
3.2

 
$
(1.0
)
 
$
6.4



We expect to contribute $15.4 million to our Company-sponsored pension plans in 2018, of which we have contributed $2.3 million through June 30, 2018.