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PENSION AND POST-RETIREMENT PLANS | 3 Months Ended
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Mar. 31, 2021
PENSION AND POST-RETIREMENT PLANS |
PENSION AND POST-RETIREMENT PLANS | 12. 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, 2020. 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 months ended March 31, 2021 and 2020 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Three Months Ended March 31, | ​ | Three Months Ended March 31,
(In millions) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Components of net periodic benefit cost (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1.2 | ​ | $ | 1.2 | ​ | $ | 0.2 | ​ | $ | 0.1
Interest cost | ​ |  | 1.5 | ​ |  | 1.9 | ​ |  | 0.2 | ​ |  | 0.2
Expected return on plan assets | ​ |  | (3.6) | ​ |  | (3.2) | ​ |  | — | ​ |  | —
Amortization of net loss | ​ |  | 1.3 | ​ |  | 1.5 | ​ |  | 0.3 | ​ |  | 0.2
Amortization of prior service credit | ​ |  | (0.6) | ​ |  | (0.6) | ​ |  | (0.9) | ​ |  | (0.9)
Net periodic benefit cost (benefit) | ​ | $ | (0.2) | ​ | $ | 0.8 | ​ | $ | (0.2) | ​ | $ | (0.4)
​

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