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EMPLOYEE BENEFITS
 6 Months Ended
Jun. 30, 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 June 30Six Months Ended June 30
(in millions)2020201920202019
Service cost$11.7  $11.8  $24.8  $23.1  
Interest cost26.1  30.2  52.2  60.8  
Expected return on plan assets(47.7) (48.2) (95.6) (96.9) 
Loss on plan settlement10.0  1.0  10.3  1.8  
Amortization of prior service cost0.4  0.5  0.8  1.1  
Amortization of net actuarial loss25.5  18.7  49.7  37.7  
Net periodic benefit cost$26.0  $14.0  $42.2  $27.6  

OPEB Benefits
Three Months Ended June 30Six Months Ended June 30
(in millions)2020201920202019
Service cost$3.5  $3.8  $7.6  $8.2  
Interest cost4.6  6.3  9.3  12.8  
Expected return on plan assets(15.1) (13.6) (30.2) (27.3) 
Amortization of prior service credit(3.8) (3.8) (7.5) (7.7) 
Amortization of net actuarial gain(5.8) (2.0) (11.2) (2.7) 
Net periodic benefit credit$(16.6) $(9.3) $(32.0) $(16.7) 

During the six months ended June 30, 2020, we made contributions and payments of $6.1 million related to our pension plans and $0.5 million related to our OPEB plans. We expect to make contributions and payments of $5.4 million related to our pension plans and $0.5 million related to our OPEB plans during the remainder of 2020, dependent upon various factors affecting us, including our liquidity position and possible tax law changes.