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Pension And Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
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, 2024 and 2023:
Pension BenefitsOPEB
Three Months Ended March 31, (in millions)
2024202320242023
Components of Net Periodic Benefit Cost(1)
Service cost$5.4 $5.1 $1.3 $1.3 
Interest cost16.3 17.1 5.4 5.4 
Expected return on assets(23.8)(23.6)(4.0)(3.8)
Amortization of prior service credit— — (0.4)(0.5)
Recognized actuarial loss7.2 8.4 0.8 0.8 
Total Net Periodic Benefit Cost $5.1 $7.0 $3.1 $3.2 
(1)The service cost component and all non-service cost components of net periodic benefit (income) cost are presented in "Operation and maintenance" and "Other, net," respectively, on the Condensed Statements of Consolidated Income (unaudited).