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PENSION AND POSTRETIREMENT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2025
PENSION AND POSTRETIREMENT PLANS |
Net periodic pension and postretirement health care benefit costs | The components of net periodic pension and postretirement health care benefit expense for the first quarter ended March 31 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | U.S. | ​ | International | ​ | U.S. Postretirement | ​
​ | ​ | Pensions | ​ | Pensions | ​ | Benefits | ​
(millions) |  | 2025 | ​ | 2024 |  | 2025 | ​ | 2024 |  | 2025 | ​ | 2024 |
Service cost | ​ | ​ | $11.7 | ​ | ​ | ​ | $11.6 | ​ | ​ | $4.6 | ​ | ​ | ​ | $4.9 | ​ | ​ | $0.1 | ​ | ​ | ​ | $0.1 | ​
Interest cost on benefit obligation |  | ​ | 22.9 | ​ | ​ | ​ | 21.8 | ​ | ​ | 10.7 | ​ | ​ | ​ | 12.4 | ​ | ​ | 1.3 | ​ | ​ | ​ | 1.3 | ​
Expected return on plan assets |  | ​ | (37.6) | ​ | ​ | ​ | (37.7) | ​ | ​ | (12.4) | ​ | ​ | ​ | (12.5) | ​ | ​ | - | ​ | ​ | ​ | - | ​
Recognition of net actuarial loss (gain) | ​ | ​ | 2.1 | ​ | ​ | ​ | 1.5 | ​ | ​ | 2.1 | ​ | ​ | ​ | 2.2 | ​ | ​ | (0.9) | ​ | ​ | ​ | (0.8) | ​
Amortization of prior service benefit | ​ | ​ | (1.1) | ​ | ​ | ​ | (1.1) | ​ | ​ | (0.1) | ​ | ​ | ​ | (0.1) | ​ | ​ | - | ​ | ​ | ​ | - | ​
Curtailments and settlements | ​ | ​ | - | ​ | ​ | ​ | 0.4 | ​ | ​ | - | ​ | ​ | ​ | - | ​ | ​ | - | ​ | ​ | ​ | - | ​
Total expense (benefit) | ​ | ​ | ($2.0) | ​ | ​ | ​ | ($3.5) | ​ | ​ | $4.9 | ​ | ​ | ​ | $6.9 | ​ | ​ | $0.5 | ​ | ​ | ​ | $0.6 | ​
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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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