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Pension And Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2022
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, 2022 and 2021:
Pension BenefitsOPEB
Three Months Ended September 30, (in millions)
2022202120222021
Components of Net Periodic Benefit (Income) Cost(1)
Service cost$6.8 $7.5 $1.6 $1.5 
Interest cost10.7 7.9 3.0 2.5 
Expected return on assets(22.6)(25.2)(4.0)(3.8)
Amortization of prior service credit— — (0.6)(0.6)
Recognized actuarial loss5.6 5.5 0.7 1.2 
Settlement loss3.0 2.9 — — 
Total Net Periodic Benefit (Income) Cost $3.5 $(1.4)$0.7 $0.8 
(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)
2022202120222021
Components of Net Periodic Benefit (Income) Cost(1)
Service cost$20.9 $22.6 $4.8 $4.5 
Interest cost29.9 23.5 9.0 7.5 
Expected return on assets(68.3)(76.3)(12.0)(11.4)
Amortization of prior service credit— — (1.8)(1.8)
Recognized actuarial loss14.9 16.3 2.1 3.6 
Settlement loss9.3 9.5 — — 
Total Net Periodic Benefit (Income) Cost $6.7 $(4.4)$2.1 $2.4 
(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).