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Employee Benefits
6 Months Ended
Jun. 30, 2016
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)
2016
 
2015
 
2016
 
2015
Service cost
$
1.6

 
$
1.2

 
$
3.2

 
$
2.4

Interest cost
14.0

 
14.3

 
28.0

 
28.6

Expected return on plan assets
(14.1
)
 
(15.0
)
 
(28.2
)
 
(30.0
)
Amortization of net pension loss
3.4

 
4.0

 
6.8

 
8.0

Total periodic pension cost
$
4.9

 
$
4.5

 
$
9.8

 
$
9.0



We expect to contribute $45.4 million to our company-sponsored pension plans in 2016 of which we have contributed $13.5 million through June 30, 2016.

Performance Incentive Awards

The Company granted performance stock units in February 2016 that will be settled in cash as the stock units vest equally over the next three years, with the first vesting occurring in February 2017. The awards are liability classified and remeasured to fair value at each reporting date until settlement.