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Pension And Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2022 and 2021:
Pension BenefitsOPEB
Three Months Ended June 30, (in millions)
2022202120222021
Components of Net Periodic Benefit (Income) Cost(1)
Service cost$7.0 $7.5 $1.6 $1.5 
Interest cost9.8 7.9 3.0 2.5 
Expected return on assets(22.8)(25.3)(4.0)(3.8)
Amortization of prior service credit— — (0.6)(0.6)
Recognized actuarial loss4.8 5.5 0.7 1.2 
Settlement loss6.3 3.3 — — 
Total Net Periodic Benefit (Income) Cost $5.1 $(1.1)$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
Six Months Ended June 30, (in millions)
2022202120222021
Components of Net Periodic Benefit (Income) Cost(1)
Service cost$14.1 $15.1 $3.2 $3.0 
Interest cost19.2 15.6 6.0 5.0 
Expected return on assets(45.7)(51.1)(8.0)(7.6)
Amortization of prior service credit— — (1.2)(1.2)
Recognized actuarial loss9.3 10.8 1.4 2.4 
Settlement loss6.3 6.6 — — 
Total Net Periodic Benefit (Income) Cost $3.2 $(3.0)$1.4 $1.6 
(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).