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PENSION AND POST-RETIREMENT PLANS | 6 Months Ended
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Jun. 30, 2024
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, 2023. 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 six months ended June 30, 2024 and 2023 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Three Months Ended June 30, | ​ | Three Months Ended June 30,
(In millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 0.8 | ​ | $ | 1.0 | ​ | $ | 0.1 | ​ | $ | —
Interest cost | ​ |  | 2.5 | ​ |  | 2.5 | ​ |  | 0.2 | ​ |  | 0.2
Expected return on plan assets | ​ |  | (3.8) | ​ |  | (3.7) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 0.1 | ​ |  | 0.4 | ​ |  | (0.2) | ​ |  | (0.5)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (0.9) | ​ |  | (0.9)
Net periodic benefit cost (credit) | ​ | $ | (0.4) | ​ | $ | 0.2 | ​ | $ | (0.8) | ​ | $ | (1.2)
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Six Months Ended June 30, | ​ | Six Months Ended June 30,
(In millions) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit cost (credit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1.7 | ​ | $ | 2.0 | ​ | $ | 0.2 | ​ | $ | 0.1
Interest cost | ​ |  | 4.9 | ​ |  | 5.0 | ​ |  | 0.5 | ​ |  | 0.4
Expected return on plan assets | ​ |  | (7.6) | ​ |  | (7.4) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 0.2 | ​ |  | 0.7 | ​ |  | (0.4) | ​ |  | (1.0)
Amortization of prior service credit | ​ |  | — | ​ |  | — | ​ |  | (1.8) | ​ |  | (1.8)
Net periodic benefit cost (credit) | ​ | $ | (0.8) | ​ | $ | 0.3 | ​ | $ | (1.5) | ​ | $ | (2.3)
​

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