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EMPLOYEE BENEFITS (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Schedule of net benefit cost (credit) | The following tables show the components of net periodic benefit cost (credit) (including amounts capitalized to our balance sheets) for our benefit plans:
|  | Pension Benefits
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 5.4 |  |  | $ | 5.4 |  |  | $ | 12.1 |  |  | $ | 12.0 |
Interest cost |  | 28.8 |  |  | 30.4 |  |  | 58.3 |  |  | 61.2 |
Expected return on plan assets |  | (45.3) |  |  | (46.4) |  |  | (91.1) |  |  | (93.8) |
Amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | 0.1 |
Amortization of net actuarial loss |  | 15.3 |  |  | 9.3 |  |  | 29.7 |  |  | 16.7 |
Net periodic benefit cost (credit) |  | $ | 4.2 |  |  | $ | (1.3) |  |  | $ | 9.0 |  |  | $ | (3.8) |
|  | OPEB Benefits
|  | Three Months Ended June 30 |  | Six Months Ended June 30
(in millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost |  | $ | 2.6 |  |  | $ | 2.4 |  |  | $ | 5.4 |  |  | $ | 4.9 |
Interest cost |  | 5.7 |  |  | 5.4 |  |  | 11.4 |  |  | 10.8 |
Expected return on plan assets |  | (13.1) |  |  | (13.2) |  |  | (26.3) |  |  | (26.5) |
Amortization of prior service credit |  | (3.4) |  |  | (3.7) |  |  | (6.8) |  |  | (7.4) |
Amortization of net actuarial gain |  | (1.9) |  |  | (3.0) |  |  | (3.8) |  |  | (6.2) |
Net periodic benefit credit |  | $ | (10.1) |  |  | $ | (12.1) |  |  | $ | (20.1) |  |  | $ | (24.4) |

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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