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EMPLOYEE BENEFITS
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
EMPLOYEE BENEFITS EMPLOYEE BENEFITS

The following tables show the components of net periodic benefit cost (credit) for our benefit plans.
 
 
Pension Benefits
 
 
Three Months Ended March 31
(in millions)
 
2020
 
2019
Service cost
 
$
13.1

 
$
11.3

Interest cost
 
26.1

 
30.6

Expected return on plan assets
 
(47.9
)
 
(48.7
)
Loss on plan settlement
 
0.3

 
0.8

Amortization of prior service cost
 
0.4

 
0.6

Amortization of net actuarial loss
 
24.2

 
19.0

Net periodic benefit cost
 
$
16.2

 
$
13.6


 
 
OPEB Benefits
 
 
Three Months Ended March 31
(in millions)
 
2020
 
2019
Service cost
 
$
4.1

 
$
4.4

Interest cost
 
4.7

 
6.5

Expected return on plan assets
 
(15.1
)
 
(13.7
)
Amortization of prior service credit
 
(3.7
)
 
(3.9
)
Amortization of net actuarial gain
 
(5.4
)
 
(0.7
)
Net periodic benefit credit
 
$
(15.4
)
 
$
(7.4
)


During the three months ended March 31, 2020, we made contributions and payments of $3.5 million related to our pension plans and $0.2 million related to our OPEB plans. We expect to make contributions and payments of $8.0 million related to our pension plans and $0.8 million related to our OPEB plans during the remainder of 2020, dependent upon various factors affecting us, including our liquidity position and the continued effects of the Tax Legislation.