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PENSION AND POST-RETIREMENT PLANS | 9 Months Ended
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Sep. 30, 2025
PENSION AND POST-RETIREMENT PLANS |
PENSION AND POST-RETIREMENT PLANS | 14. PENSION AND POST-RETIREMENT PLANS ​ The Company’s pension and post-retirement plans are described in Note 11 to the Consolidated Financial Statements included in Part II, Item 8 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income (Loss) for the qualified pension plans and the post-retirement benefit plans for the three and nine months ended September 30, 2025 and 2024 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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