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EMPLOYEE BENEFITS
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [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)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
11.8

 
$
11.8

 
$
23.1

 
$
23.8

Interest cost
 
30.2

 
28.7

 
60.8

 
57.0

Expected return on plan assets
 
(48.2
)
 
(48.8
)
 
(96.9
)
 
(98.4
)
Loss on plan settlement
 
1.0

 
0.3

 
1.8

 
0.7

Amortization of prior service cost
 
0.5

 
0.6

 
1.1

 
1.3

Amortization of net actuarial loss
 
18.7

 
23.9

 
37.7

 
47.0

Net periodic benefit cost
 
$
14.0

 
$
16.5

 
$
27.6

 
$
31.4


 
 
OPEB Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
3.8

 
$
5.6

 
$
8.2

 
$
11.8

Interest cost
 
6.3

 
7.4

 
12.8

 
14.9

Expected return on plan assets
 
(13.6
)
 
(14.8
)
 
(27.3
)
 
(29.7
)
Amortization of prior service credit
 
(3.8
)
 
(3.9
)
 
(7.7
)
 
(7.7
)
Amortization of net actuarial (gain) loss
 
(2.0
)
 
0.2

 
(2.7
)
 
0.5

Net periodic benefit credit
 
$
(9.3
)
 
$
(5.5
)
 
$
(16.7
)
 
$
(10.2
)


During the six months ended June 30, 2019, we made contributions and payments of $6.9 million related to our pension plans and $1.4 million related to our OPEB plans. We expect to make contributions and payments of $4.9 million related to our pension plans and $5.3 million related to our OPEB plans during the remainder of 2019, dependent upon various factors affecting us, including our liquidity position and the effects of the Tax Legislation.