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PENSION AND POST-RETIREMENT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2025
PENSION AND POST-RETIREMENT PLANS |
Schedule of components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income (Loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Three Months Ended September 30, | ​ | Three Months Ended September 30,
(In millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1.3 | ​ | $ | 1.1 | ​ | $ | — | ​ | $ | —
Interest cost | ​ |  | 2.6 | ​ |  | 2.4 | ​ |  | 0.3 | ​ |  | 0.3
Expected return on plan assets | ​ |  | (4.4) | ​ |  | (3.8) | ​ |  | — | ​ |  | —
Amortization of net actuarial loss (gain) | ​ |  | — | ​ |  | 0.1 | ​ |  | (0.2) | ​ |  | (0.2)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (2.7) | ​ |  | (1.0)
Net periodic benefit credit | ​ | $ | (0.5) | ​ | $ | (0.2) | ​ | $ | (2.6) | ​ | $ | (0.9)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Nine Months Ended September 30, | ​ | Nine Months Ended September 30,
(In millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 3.5 | ​ | $ | 2.8 | ​ | $ | 0.1 | ​ | $ | 0.2
Interest cost | ​ |  | 7.8 | ​ |  | 7.3 | ​ |  | 0.8 | ​ |  | 0.8
Expected return on plan assets | ​ |  | (13.2) | ​ |  | (11.4) | ​ |  | — | ​ |  | —
Amortization of net actuarial loss (gain) | ​ |  | — | ​ |  | 0.3 | ​ |  | (0.5) | ​ |  | (0.6)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (4.6) | ​ |  | (2.8)
Net periodic benefit credit | ​ | $ | (1.9) | ​ | $ | (1.0) | ​ | $ | (4.2) | ​ | $ | (2.4)
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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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