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EMPLOYEE BENEFITS
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFITS
EMPLOYEE BENEFITS

The following tables show the components of net periodic pension and OPEB costs for our benefit plans.
 
 
Pension Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
10.4

 
$
10.7

 
$
22.1

 
$
22.0

Interest cost
 
30.2

 
33.0

 
61.4

 
66.2

Expected return on plan assets
 
(48.5
)
 
(49.0
)
 
(98.1
)
 
(98.0
)
Loss on plan settlement
 
5.3

 
14.1

 
5.3

 
14.1

Amortization of prior service cost
 
0.8

 
0.8

 
1.5

 
1.7

Amortization of net actuarial loss
 
21.1

 
20.2

 
43.0

 
40.7

Net periodic benefit cost
 
$
19.3

 
$
29.8

 
$
35.2

 
$
46.7


 
 
OPEB Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
5.6

 
$
6.4

 
$
11.9

 
$
13.1

Interest cost
 
8.4

 
9.3

 
16.9

 
18.5

Expected return on plan assets
 
(13.6
)
 
(13.3
)
 
(27.3
)
 
(26.4
)
Amortization of prior service credit
 
(2.8
)
 
(2.4
)
 
(5.6
)
 
(4.7
)
Amortization of net actuarial loss
 
0.1

 
1.9

 
1.6

 
4.2

Net periodic benefit (credit) cost
 
$
(2.3
)
 
$
1.9

 
$
(2.5
)
 
$
4.7



During the six months ended June 30, 2017, we made payments of $107.2 million to our pension plans and $4.3 million to our OPEB plans. We expect to make payments of $6.4 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2017, dependent upon various factors affecting us, including our liquidity position and possible tax law changes.