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BENEFIT PLANS: (Tables) | 3 Months Ended
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Mar. 31, 2020
Post retirement defined benefit plans and defined contribution plan |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | The components of net periodic benefit costs for the three months ended March 31, 2020 and 2019 are as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2020 |  | 2019
Service cost | ​ | $ | 0.4 | ​ | $ | 0.3
Interest cost | ​ |  | 0.5 | ​ |  | 0.4
Expected return on plan assets | ​ |  | (0.7) | ​ |  | (0.8)
Amortization of prior service cost / (credit) | ​ |  | (*) | ​ |  | (*)
Amortization of net loss/(gain) | ​ |  | (*) | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 0.2 | ​ | $ | (0.1)
Post-retirement Health care plans |
Components of net periodic benefit costs |
Schedule of the components of net periodic benefit costs | ​ The components of net periodic benefit cost for the three months ended March 31, 2020 and 2019 are as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​
(in millions) |  | 2020 |  | 2019
Interest cost | ​ | $ | 0.3 | ​ | $ | 0.2
Amortization of net loss (gain) | ​ |  | (*) | ​ |  | (*)
Amortization of prior service cost/ (credit) | ​ |  | (*) | ​ |  | (*)
Net periodic benefit cost | ​ | $ | 0.3 | ​ | $ | 0.2
(*) amount is lower than $0.1 million

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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