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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
 
$
2.0

 
$
2.6

 
$
4.3

 
$
5.2

Interest cost
 
7.0

 
6.5

 
14.1

 
13.0

Expected return on plan assets
 
(12.0
)
 
(11.9
)
 
(24.0
)
 
(24.1
)
Amortization of net actuarial loss
 
4.5

 
5.5

 
8.9

 
10.5

Net periodic benefit cost
 
$
1.5

 
$
2.7

 
$
3.3

 
$
4.6



 
 
OPEB Costs
 
 
Three Months Ended June 30
 
Six Months Ended June 30
(in millions)
 
2019
 
2018
 
2019
 
2018
Service cost
 
$
1.0

 
$
1.5

 
$
2.1

 
$
3.1

Interest cost
 
1.7

 
2.1

 
3.3

 
4.1

Expected return on plan assets
 
(4.2
)
 
(4.5
)
 
(8.3
)
 
(8.9
)
Amortization of prior service credit
 
(2.8
)
 
(2.9
)
 
(5.7
)
 
(5.7
)
Amortization of net actuarial loss
 
0.4

 
0.6

 
0.8

 
1.2

Net periodic benefit credit
 
$
(3.9
)
 
$
(3.2
)
 
$
(7.8
)
 
$
(6.2
)


During the six months ended June 30, 2019, we made contributions and payments of $0.3 million related to our pension plans. We did not contribute to our OPEB plans. We expect to make contributions and payments of $0.4 million related to our pension plans and an insignificant amount 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.