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Pension And Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2020
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 months ended March 31, 2020 and 2019:
| Pension Benefits |  | Other Postretirement Benefits
Three Months Ended March 31, (in millions) | 2020 |  | 2019 |  | 2020 |  | 2019
Components of Net Periodic Benefit Cost(1) |  |  |  |  |  |  |
Service cost | $ | 8.0 |  |  | $ | 7.3 |  |  | $ | 1.6 |  |  | $ | 1.3 |
Interest cost | 13.5 |  |  | 18.2 |  |  | 3.9 |  |  | 4.8 |
Expected return on assets | (28.4 | ) |  | (27.2 | ) |  | (3.6 | ) |  | (3.3 | )
Amortization of prior service credit | 0.2 |  |  | — |  |  | (0.5 | ) |  | (0.8 | )
Recognized actuarial loss | 8.7 |  |  | 11.4 |  |  | 1.3 |  |  | 0.5 |
Total Net Periodic Benefit Cost | $ | 2.0 |  |  | $ | 9.7 |  |  | $ | 2.7 |  |  | $ | 2.5 |
(1)The service cost component and all non-service cost components of net periodic benefit cost are presented in "Operation and maintenance" and "Other, net", respectively, on the Condensed Statements of Consolidated Income (unaudited).

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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=118255775&loc=d3e1928-114920 + Details
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