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PENSION AND POST-RETIREMENT PLANS | 9 Months Ended
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Sep. 30, 2019
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, 2018. Components of net periodic benefit cost for the Company’s qualified defined benefit pension and post-retirement plans for the three and nine months ended September 30, 2019 and 2018 consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Three Months Ended September 30, | ​ | Three Months Ended September 30,
(In millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Components of net periodic benefit cost (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 1.3 | ​ | $ | 1.1 | ​ | $ | — | ​ | $ | 0.2
Interest cost | ​ |  | 2.4 | ​ |  | 2.1 | ​ |  | 0.1 | ​ |  | 0.3
Expected return on plan assets | ​ |  | (2.7) | ​ |  | (3.3) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 2.2 | ​ |  | 1.0 | ​ |  | (0.5) | ​ |  | 0.3
Amortization of prior service credit | ​ |  | (0.5) | ​ |  | (0.5) | ​ |  | (0.9) | ​ |  | (1.0)
Net periodic benefit cost (benefit) | ​ | $ | 2.7 | ​ | $ | 0.4 | ​ | $ | (1.3) | ​ | $ | (0.2)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
​ | ​ | Nine Months Ended September 30, | ​ | Nine Months Ended September 30,
(In millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Components of net periodic benefit cost (benefit): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 3.5 | ​ | $ | 3.3 | ​ | $ | 0.3 | ​ | $ | 0.5
Interest cost | ​ |  | 7.0 | ​ |  | 6.4 | ​ |  | 0.7 | ​ |  | 0.8
Expected return on plan assets | ​ |  | (9.0) | ​ |  | (10.1) | ​ |  | — | ​ |  | —
Amortization of net loss (gain) | ​ |  | 4.0 | ​ |  | 3.4 | ​ |  | (0.1) | ​ |  | 1.1
Amortization of prior service credit | ​ |  | (1.7) | ​ |  | (1.7) | ​ |  | (2.8) | ​ |  | (2.8)
Net periodic benefit cost (benefit) | ​ | $ | 3.8 | ​ | $ | 1.3 | ​ | $ | (1.9) | ​ | $ | (0.4)
​

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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