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Pension And Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Components Of The Plans' Net Periodic Benefits Cost
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).