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Pension And Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2023
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 and six months ended June 30, 2023 and 2022:
Pension BenefitsOPEB
Three Months Ended June 30, (in millions)
2023202220232022
Components of Net Periodic Benefit Cost(1)
Service cost$5.1 $7.0 $1.3 $1.6 
Interest cost17.1 9.8 5.5 3.0 
Expected return on assets(23.6)(22.8)(3.8)(4.0)
Amortization of prior service credit— — (0.5)(0.6)
Recognized actuarial loss8.4 4.8 0.8 0.7 
Settlement loss0.1 6.3 — — 
Total Net Periodic Benefit Cost $7.1 $5.1 $3.3 $0.7 
(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).
Pension BenefitsOPEB
Six Months Ended June 30, (in millions)
2023202220232022
Components of Net Periodic Benefit Cost(1)
Service cost$10.2 $14.1 $2.6 $3.2 
Interest cost34.2 19.2 10.9 6.0 
Expected return on assets(47.2)(45.7)(7.6)(8.0)
Amortization of prior service credit— — (1.0)(1.2)
Recognized actuarial loss16.8 9.3 1.6 1.4 
Settlement loss0.1 6.3 — — 
Total Net Periodic Benefit Cost $14.1 $3.2 $6.5 $1.4 
(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).