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Employee Benefits
 9 Months Ended
Sep. 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 nine months ended September 30:
 
 
Three Months
 
Nine Months
(in millions)
2018
 
2017
 
2018
 
2017
Service cost
$
0.1

 
$
1.3

 
$
0.3

 
$
3.9

Interest cost
11.1

 
12.8

 
32.9

 
38.4

Expected return on plan assets
(15.0
)
 
(14.8
)
 
(45.2
)
 
(44.4
)
Amortization of prior service credit
(0.1
)
 
—

 
(0.3
)
 
—

Amortization of prior net pension loss
3.5

 
3.9

 
10.9

 
11.7

Settlement loss
7.2

 
—

 
7.2

 
—

Total net periodic pension cost
$
6.8

 
$
3.2

 
$
5.8

 
$
9.6



For the three and nine months ended September 30, 2018, net periodic pension cost included a non-union pension settlement charge at YRC Freight of $7.2 million. The pension settlement charge was triggered due to the amount of lump sum benefit payments distributed from plan assets in 2018. The lump sum benefit payments reduce pension obligations and are funded from existing pension plan assets and therefore do not impact the Company’s cash balance.

We expect to contribute $15.4 million to our Company-sponsored pension plans in 2018, of which we have contributed $13.4 million through September 30, 2018.