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PENSION AND POST-RETIREMENT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2024
PENSION AND POST-RETIREMENT PLANS |
Components of net periodic benefit cost (credit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Three Months Ended September 30, | ​ | Three Months Ended September 30,
(In millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1.1 | ​ | $ | 0.3 | ​ | $ | — | ​ | $ | 0.1
Interest cost | ​ |  | 2.4 | ​ |  | 2.5 | ​ |  | 0.3 | ​ |  | 0.3
Expected return on plan assets | ​ |  | (3.8) | ​ |  | (3.0) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 0.1 | ​ |  | 0.2 | ​ |  | (0.2) | ​ |  | (0.5)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (1.0) | ​ |  | (1.0)
Net periodic benefit cost (credit) | ​ | $ | (0.2) | ​ | $ | (0.0) | ​ | $ | (0.9) | ​ | $ | (1.1)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Nine Months Ended September 30, | ​ | Nine Months Ended September 30,
(In millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 2.8 | ​ | $ | 2.3 | ​ | $ | 0.2 | ​ | $ | 0.2
Interest cost | ​ |  | 7.3 | ​ |  | 7.5 | ​ |  | 0.8 | ​ |  | 0.7
Expected return on plan assets | ​ |  | (11.4) | ​ |  | (10.4) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 0.3 | ​ |  | 0.9 | ​ |  | (0.6) | ​ |  | (1.5)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (2.8) | ​ |  | (2.8)
Net periodic benefit cost (credit) | ​ | $ | (1.0) | ​ | $ | 0.3 | ​ | $ | (2.4) | ​ | $ | (3.4)
​

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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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