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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS | PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
Components of Net Periodic Benefit Cost (Credit) | Pension |  | Other Postretirement
| 2025 |  | 2024 |  | 2025 |  | 2024
Millions |  |  |  |  |  |  |
Quarter Ended June 30, |  |  |  |  |  |  |
Service Cost | $1.6 |  |  | $1.7 |  |  | $0.5 |  |  | $0.4 |
Non-Service Cost Components (a) |  |  |  |  |  |  |
Interest Cost | 9.9 |  |  | 9.6 |  |  | 1.0 |  |  | 0.9 |
Expected Return on Plan Assets | (10.9) |  |  | (11.2) |  |  | (2.7) |  |  | (2.8) |
Amortization of Prior Service Credits | — |  |  | — |  |  | (1.5) |  |  | (2.9) |
Amortization of Net Loss (Gain) | 1.9 |  |  | 1.6 |  |  | (0.6) |  |  | (0.8) |
Net Periodic Benefit Cost (Credit) | $2.5 |  |  | $1.7 |  |  | $(3.3) |  | $(5.2)
Six Months Ended June 30, |  |  |  |  |  |  |
Service Cost | $3.2 |  |  | $3.3 |  |  | $0.9 |  |  | $0.8 |
Non-Service Cost Components (a) |  |  |  |  |  |  |
Interest Cost | 19.9 |  |  | 19.3 |  |  | 2.0 |  |  | 1.9 |
Expected Return on Plan Assets | (21.8) |  |  | (22.4) |  |  | (5.4) |  |  | (5.6) |
Amortization of Prior Service Credits | — |  |  | — |  |  | (2.9) |  |  | (5.8) |
Amortization of Net Loss (Gain) | 3.7 |  |  | 3.2 |  |  | (1.3) |  |  | (1.6) |
Net Periodic Benefit Cost (Credit) | $5.0 |  |  | $3.4 |  |  | $(6.7) |  | $(10.3)
(a)These components of net periodic benefit cost (credit) are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income. Employer Contributions. For the six months ended June 30, 2025, we contributed $19.1 million in cash to the defined benefit pension plans ($25.0 million for the six months ended June 30, 2024); we do not expect to make additional contributions to our defined benefit pension plans in 2025. For the six months ended June 30, 2025 and 2024, we made no contributions to our other postretirement benefit plans; we do not expect to make any contributions to our other postretirement benefit plans in 2025.

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