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Pension And Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2023 and 2022:
Pension BenefitsOPEB
Three Months Ended September 30, (in millions)
2023202220232022
Components of Net Periodic Benefit Cost(1)
Service cost$5.1 $6.8 $1.3 $1.6 
Interest cost17.1 10.7 5.4 3.0 
Expected return on assets(23.6)(22.6)(3.8)(4.0)
Amortization of prior service credit— — (0.5)(0.6)
Recognized actuarial loss8.4 5.6 0.8 0.7 
Settlement loss7.4 3.0 — — 
Total Net Periodic Benefit Cost $14.4 $3.5 $3.2 $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
Nine Months Ended September 30, (in millions)
2023202220232022
Components of Net Periodic Benefit Cost(1)
Service cost$15.3 $20.9 $3.9 $4.8 
Interest cost51.3 29.9 16.3 9.0 
Expected return on assets(70.8)(68.3)(11.4)(12.0)
Amortization of prior service credit— — (1.5)(1.8)
Recognized actuarial loss25.2 14.9 2.4 2.1 
Settlement loss7.5 9.3 — — 
Total Net Periodic Benefit Cost $28.5 $6.7 $9.7 $2.1 
(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).