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Pension And Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 and 2020:
| Pension Benefits |  | Other Postretirement Benefits
Three Months Ended June 30, (in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Components of Net Periodic Benefit (Income) Cost(1) |  |  |  |  |  |  |
Service cost | $ | 7.5 |  |  | $ | 8.0 |  |  | $ | 1.5 |  |  | $ | 1.6 |
Interest cost | 7.9 |  |  | 13.5 |  |  | 2.5 |  |  | 3.9 |
Expected return on assets | (25.3) |  |  | (28.4) |  |  | (3.8) |  |  | (3.6) |
Amortization of prior service credit | — |  |  | 0.2 |  |  | (0.6) |  |  | (0.5) |
Recognized actuarial loss | 5.5 |  |  | 8.7 |  |  | 1.2 |  |  | 1.3 |
Settlement loss | 3.3 |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit (Income) Cost | $ | (1.1) |  |  | $ | 2.0 |  |  | $ | 0.8 |  |  | $ | 2.7 |
(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 (Loss) (unaudited).
| Pension Benefits |  | Other Postretirement Benefits
Six Months Ended June 30, (in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Components of Net Periodic Benefit (Income) Cost(1) |  |  |  |  |  |  |
Service cost | $ | 15.1 |  |  | $ | 16.0 |  |  | $ | 3.0 |  |  | $ | 3.2 |
Interest cost | 15.6 |  |  | 27.0 |  |  | 5.0 |  |  | 7.8 |
Expected return on assets | (51.1) |  |  | (56.8) |  |  | (7.6) |  |  | (7.2) |
Amortization of prior service credit | — |  |  | 0.4 |  |  | (1.2) |  |  | (1.0) |
Recognized actuarial loss | 10.8 |  |  | 17.4 |  |  | 2.4 |  |  | 2.6 |
Settlement loss | 6.6 |  |  | — |  |  | — |  |  | — |
Total Net Periodic Benefit (Income) Cost | $ | (3.0) |  |  | $ | 4.0 |  |  | $ | 1.6 |  |  | $ | 5.4 |
(1)The service cost component and all non-service cost components of net periodic benefit cost (income) are presented in "Operation and maintenance" and "Other, net," respectively, on the Condensed Statements of Consolidated Income (Loss) (unaudited).
Schedule of Defined Benefit Plans Disclosures | The following table provides the key assumptions that were used to calculate the pension benefit obligation and the net periodic benefit cost at the interim remeasurement date for the plan that triggered settlement accounting:
| February 28, 2021
Weighted-average Assumption to Determine Benefit Obligation |
Discount rate | 2.57 | %
Weighted-average Assumptions to Determine Net Periodic Benefit Costs for the period ended |
Discount rate - service cost | 2.81 | %
Discount rate - interest cost | 1.57 | %
Expected return on assets | 4.80 | %

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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