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Pension And Other Postretirement Benefits
 3 Months Ended
Mar. 31, 2020
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Pension And Other Postretirement Benefits Pension and Other Postretirement Benefits
We provide defined contribution plans and noncontributory defined benefit retirement plans that cover certain of our employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, we provide health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for us. The expected cost of such benefits is accrued during the employees’ years of service. For most plans, cash contributions are remitted to grantor trusts.
For the three months ended March 31, 2020, we contributed $0.8 million to our pension plans and $6.3 million to our other postretirement benefit plans.
The following table provides the components of the plans’ actuarially determined net periodic benefit cost for the three months ended March 31, 2020 and 2019:

Pension Benefits
 
Other Postretirement
Benefits
Three Months Ended March 31, (in millions)
2020
 
2019
 
2020
 
2019
Components of Net Periodic Benefit Cost(1)
 
 
 
 
 
 
 
Service cost
$
8.0

 
$
7.3

 
$
1.6

 
$
1.3

Interest cost
13.5

 
18.2

 
3.9

 
4.8

Expected return on assets
(28.4
)
 
(27.2
)
 
(3.6
)
 
(3.3
)
Amortization of prior service credit
0.2

 
—

 
(0.5
)
 
(0.8
)
Recognized actuarial loss
8.7

 
11.4

 
1.3

 
0.5

Total Net Periodic Benefit Cost
$
2.0

 
$
9.7

 
$
2.7

 
$
2.5

(1)The service cost component and all non-service cost components of net periodic benefit cost are presented in "Operation and maintenance" and "Other, net", respectively, on the Condensed Statements of Consolidated Income (unaudited).